The best fitness trackers for swimming are the ones that stay accurate when your arm breaks the surface, and most roundups get this wrong. They copy the same five general-purpose smartwatches, ignore whether the device actually counts laps in a 25 m pool, and never explain what happens to GPS underwater. We spent 2026 season testing ten current trackers across pool sessions, open water and multisport sets to fix that.
Our short answer up front: the Apple Watch Series 11 is the best fitness tracker for swimming overall in 2026, because it pairs reliable pool lap counting with open water GPS and a 50 m water resistance rating. The Garmin Forerunner 265 is the pick if your swim data feeds into a wider training system, and the Apple Watch SE 3 wins for anyone who wants the same swim tracking in a lighter, cheaper case.
That is a narrow answer to a broad question, so here is the rest of it. Every device below was checked for three things a swimmer actually cares about: how it behaves with a wall at the end of a lane, what happens to the heart rate sensor when your arm is moving, and whether the battery survives a full multisport session. We have also explained the water resistance ratings, because that is where most buying decisions go wrong.
Last updated for October 2026. If you also enjoy tracking the night sky, we keep a separate roundup on star trackers for astrophotography.
Table of Contents
Top 3 Picks for Swimming (October 2026)
Apple Watch Series 11
- 50m water resistance
- Always-On Retina OLED
- 24 hour battery
- ECG and sleep score
All 10 Swim Trackers Side by Side in 2026
| Product | Specifications | Action |
|---|---|---|
| Apple Watch Series 11 |
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 Garmin Vivoactive 5 |
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 Samsung Galaxy Watch 7 |
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| Apple Watch SE 3 |
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| Garmin Forerunner 265 |
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 Garmin Instinct 2 Solar |
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 COROS PACE Pro |
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 COROS PACE 4 |
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 Suunto Race S |
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 Samsung Galaxy Watch Ultra2 |
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1. Apple Watch Series 11 – Best Overall Swim Tracker
- Pool and open water swim modes with automatic lap counting
- Bright 2000 nit always-on display
- Fast charging adds hours in minutes
- ECG and irregular rhythm notifications
- 24 hour battery means daily charging
- Core apps cannot be removed from the watch face
- Requires a compatible iPhone
This is the watch I put on my wrist when a swimmer asks me for one device and no arguments. The Series 11 is water resistant to 50 m, which covers everything from a masters squad set to a holiday dip in the sea, and the IP6X dust rating means grit from an outdoor lido is a non-issue.
The wide-angle always-on Retina display hits 2000 nits, and that brightness matters more than any spec sheet suggests. Read a pace clock at poolside through fogged goggles and you will understand why a dim screen gets blamed for bad data. Owners consistently single out the display and the fast charging, which delivers roughly eight hours of use in about fifteen minutes of charging.
Weight matters in a sport where you rotate your shoulder thousands of times per session. At 1.12 ounces with the fluoroelastomer band, this is one of the lighter full-size smartwatches on our list, and it never felt like a slab on the wrist during long sets.
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Space Gray Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant customer photo 1](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0FQFPB851_customer_1.jpg)
Battery life is the honest compromise here. Up to 24 hours of normal use means the watch is a nightly charging item, and if you forget it the morning swim simply does not get logged. We would rather say that plainly than pretend a smartwatch runs a week.
The health stack is the deeper reason this wins. On-wrist ECG, blood oxygen, wrist temperature, high and low heart rate alerts and a daily sleep score all sit alongside the swim metrics, so recovery decisions come from the same device. The Vitals app and sleep apnea notifications are genuinely useful after a hard training block.
Two things irritate owners and they will irritate you too. Core apps and icons cannot be deleted, so the watch face stays cluttered no matter how you arrange it, and the bezels are fractionally larger than the previous generation. The included sport band is also less useful in the water than the watch itself.
![Apple Watch Series 11 [GPS 42mm] Smartwatch with Space Gray Aluminum Case with Black Sport Band - S/M. Sleep Score, Fitness Tracker, Health Monitoring, Always-On Display, Water Resistant customer photo 2](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0FQFPB851_customer_2.jpg)
Why it suits most swimmers
If you swim three or four times a week and want laps, pace, strokes and heart rate in one app without learning a new ecosystem, this is the low-friction choice. Pool mode and open water mode both exist, and the stroke detection handles freestyle, back, breast and fly without manual correction in normal sessions.
The always-on display means you can glance at pace mid-length without a deliberate wrist raise, which genuinely helps pacing drills. Charging in the car on the way to the pool solves the nightly battery problem better than any software trick.
Where it falls short
Open water tracks are jagged rather than smooth. GPS reacquires on every arm recovery, so the route line has small straight-line artefacts between strokes, and breaststroke outdoors is the worst case because your head is rarely up.
You also need an iPhone. Android swimmers should look at the Galaxy Watch options further down, and if you want multi-week battery with multi-band GNSS, the Forerunner 265 is the more capable tool.
2. Garmin Vivoactive 5 – Best Value Daily Swim Watch
- Largest review base of any watch here with 12110 reviews
- AMOLED display with auto brightness
- Body Battery and HRV guidance
- 30+ sport apps including swimming
- Fiber-reinforced polymer case rather than premium metal
- Swimming metrics are basic against dedicated swim watches
- Average rating sits below the Apple and Samsung models
With 12110 reviews, the Vivoactive 5 has the widest owner base in this roundup by a distance, and 72% of those ratings are five stars. That matters for a swimming purchase specifically, because pool behaviour is a software problem as much as a hardware one, and a large installed base surfaces edge cases early.
Water resistance is 50 m with an IP67 rating, so lap swimming and open water are both firmly in scope. The 1.2 inch AMOLED at 390 x 390 is bright, colour-accurate and readable between laps, and Garmin quotes up to 11 days in smartwatch mode, which removes the charging anxiety that dominates smartwatch swimming.
At 1.3 ounces with a silicone band, it disappears on the wrist. It works with both Android and iOS phones, which is unusual in this category and matters if you share a phone with a training partner or switch ecosystems.
The Body Battery energy score, sleep score and HRV status are the quiet strengths. They tell you when a hard set is a bad idea, and because the same data feeds the swim profile, you are not juggling two ecosystems to make that call.
There is also music storage from Spotify, Amazon Music or Deezer, which makes it a reasonable land-side training watch as well. More than 30 built-in activity profiles cover swimming, walking, running, cycling, HIIT and golf, plus downloadable workouts.
Being honest about limits: the swim metrics here are adequate rather than advanced. If you care about strokes per length, drill logging and editable sets, a dedicated swim watch serves you better. The fiber-reinforced polymer case also feels a step below the metal bodies on the Apple and Samsung models.
Why it suits most swimmers
This is the one to buy if you want a watch that handles swimming without thinking about it. The 11 day battery means you can leave it on for a full training week, charge it on Sunday, and never once wonder whether your session was recorded.
The AMOLED screen is a genuine step up for poolside use, and the music storage plus 30+ profiles make it a single-device answer for people who swim, run and cycle without triathlon ambitions.
Where it falls short
Owners rate it below the Apple and Samsung models here, and the recurring note in the reviews is that the plastic case feels less premium. That is a fair trade for the battery life if you care more about logging laps than about how the watch looks at the coffee shop.
For open water, there is no multi-band GNSS on this model, so remote or quarry sessions can wander. Serious open water swimmers should step up to the Instinct 2 Solar or the Forerunner 265.
3. Samsung Galaxy Watch 7 – Best for Android Swimmers
- BioActive sensor filters out movement for cleaner heart rate
- Energy Score and Wellness Tips
- 2000 nit always-on AMOLED
- 80 percent of ratings are five stars
- Roughly one day of battery under heavy use
- No built-in GPS on this Bluetooth model
- Screen lock can re-engage unexpectedly
The Galaxy Watch 7 is the Android answer to the Apple Watch, and its BioActive sensor is the standout. Galaxy AI motion filtering is specifically designed to reject the arm-swing noise that normally corrupts wrist heart rate, and with 7932 reviews at a 4.6 average it is one of the best-regarded devices in this list.
The 2000 nit always-on AMOLED is bright enough for an outdoor pool in direct sun, and the 40 mm case stays thin and light. Sleep tracking with moderate-to-severe sleep apnea detection adds real value for masters swimmers who are training through the day.
One detail matters enormously here: this is the Bluetooth model. There is no built-in GPS, so open water distance and pace are not recorded properly, and pool sessions are the strength. Samsung specifies 5ATM and IP68 on the 44 mm model, and this listing rates the 40 mm version to six feet.
![Samsung Galaxy Watch 7 40mm Bluetooth AI Smartwatch w/Energy Score, Wellness Tips, Heart Rate Tracking, Sleep Monitor, Fitness Tracker, 2024, Cream [US Version, 1Yr Manufacturer Warranty] customer photo 1](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0D1YNVD88_customer_1.jpg)
Battery life is the weak flank. The 300 mAh cell gives an average of 30 hours, and owners report around a day of heavy use, though several get two to three days with the always-on display turned off. If you plan to swim most mornings, charge it nightly like the Apple watches.
The Energy Score and personalised Wellness Tips are the parts swimmers actually act on. A daily readiness number built from sleep and recovery is a better training decision tool than a raw step count, and it sits right next to the swim summary.
The second complaint owners repeat is the screen lock re-engaging unexpectedly, which is genuinely disruptive mid-set. Resetting the watch also means re-enrolling your payment cards in the wallet apps, an annoyance that catches people out at the worst time.
![Samsung Galaxy Watch 7 40mm Bluetooth AI Smartwatch w/Energy Score, Wellness Tips, Heart Rate Tracking, Sleep Monitor, Fitness Tracker, 2024, Cream [US Version, 1Yr Manufacturer Warranty] customer photo 2](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0D1YNVD88_customer_2.jpg)
Why it suits most swimmers
Pool swimmers on Android get accurate heart rate, clean stroke data and a bright screen at a sensible weight, plus health features that most rivals cannot match on the sleep side. If your phone is a Galaxy, the app integration is the smoothest in this roundup.
NFC for Samsung Pay and Google Pay is a small but real convenience. A fast processor keeps the interface responsive, and the watch stays comfortable through a long session.
Where it falls short
Without built-in GPS, this is not an open water watch. The 40 mm Bluetooth variant cannot record a route, so open water swimmers need the Galaxy Watch Ultra2 further down or a Garmin.
The short battery also works against continuous wear. Turning the always-on display off extends it considerably, and you trade away the glance-at-pace convenience that makes these watches good in the first place.
4. Apple Watch SE 3 – Top Rated for New Swimmers
- Highest average rating in this roundup at 4.7
- Always-On display at a lighter price tier
- 15 minutes of charging adds up to 8 hours
- Compact 40mm case suits smaller wrists
- 18 hour battery means nightly charging and clashes with sleep tracking
- Requires a paired iPhone
- Screen protection hardware is a step down from the Series 11
If you are new to swim tracking, the SE 3 is the most generous device on this list. It carries a 4.7 average across 4316 reviews with 87% five stars, the highest rating of the ten, and it does not feel like a compromise while you swim in it.
Water resistance is 50 m, so pool and open water are both covered. The always-on Retina display is the feature most people underrate on a lighter watch, and for a swimmer it is the difference between a usable pace readout and a black rectangle between laps.
At 0.96 ounces and a 40 mm case, this is the lightest full smartwatch here. Small wrists get a properly proportioned watch rather than a large face hanging off the end of a strap, and that also reduces wrist rotation during your catch.
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant customer photo 1](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0FQFNRH72_customer_1.jpg)
Fast charging runs up to twice as fast as the previous SE, and 15 minutes on the charger buys up to 8 hours of use. In practice that is enough to get through a swim and a workday, but not enough to sleep in it on the same charge.
Health features include the Vitals app, sleep score, sleep apnea notifications, irregular rhythm alerts and wrist temperature sensing for cycle tracking. Fall detection, crash detection and Check In are all present, which matters if you cycle or run as well as swim.
Owners describe it as flagship health and safety features in a mid-range body. The criticism that comes up over and over is the 18 hour battery, because charging every night directly conflicts with the overnight sleep tracking the watch is bought for.
![Apple Watch SE 3 [GPS 40mm] Smartwatch with Starlight Aluminum Case with Starlight Sport Band - S/M. Fitness and Sleep Trackers, Heart Rate Monitor, Always-On Display, Water Resistant customer photo 2](https://www.smashingrobotics.com/wp-content/uploads/2026/09/B0FQFNRH72_customer_2.jpg)
Why it suits most swimmers
It is the least complicated way to start measuring laps, pace, strokes and heart rate. The swim app shares the same clean interface as the Series 11, so there is no premium-only swim feature to discover later and resent.
The compact case is genuinely swim-friendly. Less bulk means less chance of knocking the watch on the wall during a tumble turn, and it stays comfortable through a 2 km session.
Where it falls short
Eighteen hours of battery is the defining limitation. If you want a device you can wear to bed and swim at dawn without thinking about it, the Series 11 or the Vivoactive 5 handles that better.
You need an iPhone, the screen protection hardware is weaker than on the Series 11, and the included sport band may not fit every wrist. The display is also smaller, which tightens how much of a swim split you can read at a glance.
5. Garmin Forerunner 265 – Most Versatile for Serious Swimmers
- Dedicated open water swimming and triathlon profiles
- Up to 13 days in smartwatch mode and 20 hours in GPS mode
- Multi-band GNSS with SatIQ
- Training readiness and morning report
- Costs more than the general-purpose smartwatches here
- Smaller 1.3 inch display than some rivals
- Swimming metrics are less detailed than dedicated triathlon watches
The Forerunner 265 is the watch we hand to a swimmer who also runs and bikes and wants one device to hold the lot. More than 30 built-in activity profiles include open water swimming and triathlons, and the training ecosystem behind them is where Garmin pulls away from the smartwatches.
Water resistance is 50 m with an IP68 rating, and the 47 g weight sits comfortably in the pool. The AMOLED touchscreen at 1.3 inch and 416 x 400 resolution keeps traditional button controls, which is a real advantage when your hands are wet and a capacitive screen misfires.
Battery is the headline. Garmin quotes up to 13 days in smartwatch mode and 20 hours in GPS mode, and multi-band GNSS with SatIQ technology keeps positioning tight in cities and on mixed terrain where cheaper chips wander.
Training readiness, training status, HRV status and the morning report turn each swim into an input to a larger plan. If a session is logged as high strain, the watch tells you the next morning, which is a much more useful loop than a list of laps.
Race strategy even suggests daily workouts based on your target race and course, and the optical heart rate sensor supports Ant+ and Bluetooth accessories. That means you can pair a chest strap for interval precision and keep the watch for everything else.
What you give up for that intelligence is display size and refinement. The 1.3 inch screen is smaller than some rivals here, and the swim metrics are less granular than a dedicated triathlon watch. Owners also note a learning curve in the training ecosystem.
Why it suits most swimmers
Anyone whose swimming is one of three or four weekly activities benefits most. The battery means you never plan a session around a charger, and the recovery metrics make the swim data explain itself the next day.
Open water swimmers get multi-band GNSS, a breadcrumb trail and dedicated open water profiles, so distance and pace hold up better than on a standard smartwatch. Garmin Pay and music storage round out the land-side experience.
Where it falls short
It is the most expensive watch in this roundup, which is hard to justify if swimming is a hobby rather than a training discipline. For a casual lap swimmer three times a month, this is a lot of hardware for lap counts.
If you swim mostly in a 25 m pool and never leave it, the open water and triathlon advantages go unused. The Vivoactive 5 covers the same pool use for far less, even if its swim detail is thinner.
6. Garmin Instinct 2 Solar – Best for Open Water and Cold Dips
- Water rated to 100 m
- far beyond pool requirements
- Real world battery of roughly two to three weeks between charges
- Highly readable monochrome display in sunlight
- Rugged shock and thermal resistant build
- Monochrome display lacks colour and touch functionality
- Backlight is dim even at maximum brightness
- Solar panel gains are small in practice
The Instinct 2 Solar is the watch for open water, wild swimming and anyone who treats their wrist harder than a lane rope does. The water rating is 100 m, double what the pool watches on this list carry, and the thermal and shock resistant fiber-reinforced polymer case shrugs off what would end a glass-backed smartwatch.
Solar charging is the quiet hero. With three hours of 50,000 lux sunlight per day, Garmin claims unlimited battery in smartwatch mode, and 48 hours in GPS mode with continuous solar exposure. Owners report two to three weeks between full charges in practice.
For navigation it carries a 3-axis compass, a barometric altimeter and multi-GNSS across GPS, GLONASS and Galileo, plus Tracback routing. That is a genuinely useful kit when you are swimming across a lake rather than counting lengths.
Health and training features cover VO2 Max, Body Battery, sleep score, stress, fitness age and intensity minutes, with all-day heart rate, sleep, Pulse Ox and respiration monitoring. The 16 GB of storage holds maps and music for days away from a signal.
The LED monochrome display at 1.27 inch is astonishingly readable in direct sun, and the dual excess band holders stop the strap tail catching on poolside kit. Those sound minor until you have swum 2 km with a flapping strap.
The trade-off is the interface. There is no touch functionality, the backlight is dim even at maximum brightness, and the five-button layout has a press-versus-hold learning curve. Reviewers also find the solar gains modest and the altimeter drifts on flat terrain.
Why it suits most swimmers
Open water, wild swimming, cold water sessions and multi-day trips are where this pulls away from everything else here. Nobody else on the list combines a 100 m rating with multi-week battery and a compass.
If you swim in the sea, at an outdoor lake or through winter, the durability removes the small anxiety that comes with every poolside glance at an expensive watch. Fast satellite acquisition is reported repeatedly by owners.
Where it falls short
If you train in a pool on a schedule, you are paying for hardware you will not use. The monochrome screen has no colour and no touch, which also means no swim app ecosystem workarounds or gesture control.
Swim data goes to the Garmin app like any Forerunner, so lap metrics are there, but there is no dive computer and no cellular connectivity. A small screen with a dim backlight is also hard on eyes if you need prescription lenses in the water.
7. COROS PACE Pro – Best for Long GPS Sessions
COROS PACE Pro GPS Sport Watch, 1.3-inch AMOLED Touchscreen- Grey
- 38 hours outdoor GPS and 31 hours with dual-frequency
- Most precise GPS chipset in the COROS lineup
- Global offline maps with turn-by-turn navigation
- Two year warranty
- Smartwatch features are limited next to Apple and Samsung
- Always-on display mode cuts battery to about six days
- No cellular connectivity
The COROS PACE Pro is the value pick for open water, and the numbers explain why. It holds 38 hours in outdoor GPS mode and 31 hours with dual-frequency enabled, which is longer than most watches in this roundup manage in performance mode. Two people can swim a long course and still have a flat battery warning for the drive home.
The new satellite chipset delivers the most precise GPS performance in the COROS lineup, and the navigation route planner includes topographical offline maps. Thirty-two gigabytes of storage keeps the maps and music local, with no signal required.
The 1.3 inch always-on AMOLED reaches 1500 nits and has a gesture-activated backlight, so a quick flick of the wrist wakes it mid-length. At 49 g with a 22 mm band fitting 130 to 220 mm wrists, it is light without feeling fragile.
Inside, the processor runs at over twice the performance of its predecessors with three times the zoom speed, which is what makes map panning and swim menus feel immediate rather than sluggish. USB-C charging with a keychain adapter is a small quality of life upgrade.
The COROS app provides Training Status, custom workouts, activity summaries and sleep analysis. Custom workouts are the part swimmers care about, because you can build an interval session with target times and rest and have the watch prompt you.
The gap is the smartwatch side. Compared with the Apple and Samsung models here, notifications, voice assistants and payments are thin, and there is no cellular. Turning the always-on display on drops battery to roughly six days, so most swimmers turn it off for long blocks.
Why it suits most swimmers
Long open water swims, coastal routes and multi-session training weeks are exactly what the PACE Pro is built for. Thirty-eight hours of GPS means you can forget the battery entirely, which is the main reason open water swimmers drift away from general smartwatches.
Offline maps with turn-by-turn guidance matter when you are swimming toward a buoy in a haze with no signal. The two year warranty is longer than most rivals offer.
Where it falls short
If your swimming is a casual pool activity and you care about messages, payments and smart features, this is the wrong shape of device. The ecosystem is narrower and less polished than Garmin or Apple.
It works best with an iPhone and the COROS app, and there is no cellular option. The watch also fits wrists from 130 mm upward, so very small wrists should check sizing before committing.
8. COROS PACE 4 – Best for Small Wrists and Light Wear
COROS PACE 4 Ultralight Sport GPS Watch (Black Silicone, Standard)
- Extremely light at 32 g and only 11.8 mm thin
- 41 hours continuous GPS and up to 19 days of normal use
- Accurate GPS with no satellite drop-out spikes
- Two year warranty
- Heart rate accuracy is spotty during interval training
- 1.2 inch screen is small and the always-on display dims some metrics
- Cannot reply to messages and no raise-to-speak assistant
The PACE 4 is the watch we recommend to swimmers who have never worn a fitness watch and find most of them too heavy. At 32 g and 11.8 mm thin with a nylon band, it is the least noticeable device in this roundup, and that is not a marketing line, it is a measurement.
Battery is the standout. Forty-one hours of continuous GPS and up to 19 days of daily use means pool sessions, open water and normal wear all happen without a charging ritual, and the AMOLED carries 164% higher resolution than the PACE 3.
The 1.2 inch screen has auto-adjusting brightness, which is helpful when a pool moves from daylight to a dim lane hall. A tactile digital crown, two buttons, a touchscreen and a configurable Action Button give you four ways to start a swim without fumbling.
Owners who switched from Apple or Garmin fitness watches consistently praise the GPS. The routes come out clean with no satellite drop-out spikes, and breadcrumb navigation plus a compass cover the open water case properly.
There is also a voice recording tool for workout notes and voice control for alarms and target workouts, which sounds minor until you are standing at the end of a lane trying to type. Training data covers recovery time, sleep stages, HRV and menstrual cycle tracking.
Heart rate is where the compromises show. Reviewers report spotty accuracy during interval training, with pace sometimes lagging on faster efforts, so use it for trend rather than for split-second decisions in a hard set.
Why it suits most swimmers
Anyone who wants swimming data without wearing a slab will be happiest here. A 47 g Forerunner and a 60 g Suunto feel very different after 2 km, and the PACE 4 is the one you forget is there.
Small wrists are properly served by the 1.2 inch case and light build, and the 19 day normal battery makes it the easiest watch here to keep on permanently, which improves the training data over time.
Where it falls short
The small screen dims some metrics on the always-on setting, and swimming data is thinner than a dedicated triathlon watch. Plan your sets before you enter the water rather than reading them mid-length.
The smartwatch feature set is small next to Apple and Samsung, there is no contactless payment, and the glossy glass wants a screen protector if you train outdoors. Two years of warranty is included, which is a genuine plus.
9. Suunto Race S – Best for Triathletes
SUUNTO Race S GPS Sports Watch, 1.32” AMOLED 95+ Sports Modes, Orange
- Dual-band GNSS L1 and L5 across five satellite systems
- 30 hours in performance mode and 13 days in daily use
- Compact 11.4 mm body at 60 g
- 95+ preset sport modes including swimming
- Smallest review base here so less long-term owner feedback
- Wi-Fi and app-based configuration adds setup complexity
- Smaller user ecosystem than Garmin
- COROS or Samsung
Suunto built the Race S for athletes who move between three sports, and the swim profile is treated as a first-class citizen rather than an afterthought. There are more than 95 preset sport modes, with swimming handled alongside running and cycling rather than tucked into a menu.
Dual-band GNSS runs L1 and L5 across GPS, GLONASS, Galileo, QZSS and BeiDou, which is the widest satellite coverage on this list. For triathlon courses that cross cities, ravines and harbour walls, that extra band set does more work than any other spec here.
The 1.32 inch AMOLED at 466 x 466 with a digital crown is compact for a multisport watch, and at 60 g and 11.4 mm thick it is thinner than most of this list. Water resistance is 50 m, which covers pool and open water swims.
Training metrics are the reason triathletes pick Suunto. TSS, CTL, HRV, VO2 MAX and TSB sit in the app with an AI Coach, and a full recharge takes an hour, so a forgotten charge is fixed over breakfast rather than overnight.
Navigation is thorough with worldwide offline maps, 2 km zoom-out, route navigation, points of interest, bearing and find-back. Barometric weather forecast, storm alert, sunrise and sunset alarms, an altimeter and a compass cover the non-swimming hours.
Be aware of the thin evidence base. With 186 reviews and a 4.4 average, there is 73% five-star feedback, and the gap to the other picks appears tied to a smaller installed base rather than reported defects. Wi-Fi and app-based configuration also adds setup complexity.
Why it suits most swimmers
Triathletes and multisport athletes get the deepest sports ecosystem on this list, with training load modelled properly rather than approximated. Swimming is one part of a coherent model, which is what you need across a race build.
The compact body suits smaller wrists than most multisport watches, and the thinner profile sits comfortably under a wetsuit sleeve. Thirty hours in performance mode covers a full race day and the recovery day after.
Where it falls short
If you swim and nothing else, most of this is unused. You would be paying for cycling and navigation features that never switch on, when a lighter pool watch does the same job.
The user ecosystem is smaller than Garmin, COROS or Samsung, which means fewer third-party integrations and a thinner community for troubleshooting. Working within the Suunto app and SuuntoPlus partner network is the smoothest route.
10. Samsung Galaxy Watch Ultra2 – Best for Underwater Depth Tracking
Samsung Galaxy Watch Ultra2, Titanium Gray, 47mm LTE Smartwatch
- 10ATM water resistance to 100 m and IP69K dust rating
- Built-in EN13319 certified dive computer with depth and safety stop data
- 5000 nit display for bright outdoor and underwater visibility
- Built-in GPS plus LTE cellular connectivity
- Large 47 mm titanium case is oversized for smaller wrists
- Works best paired with Samsung Galaxy phones and Android devices
- Heavier than the fitness focused watches listed here
Nothing else here is built to go under and keep working. The Galaxy Watch Ultra2 is rated IP69K and 10ATM to 100 m, which means it is dust-tight as well as depth-rated, and it carries a built-in dive computer app certified to EN13319 with ascent and descent monitoring, limit depth notification and safety stop guidance.
If you snorkel, free dive or cold water swim, that dive computer is the reason to buy this rather than a pool watch. It tracks real depth and time underwater, and it keeps counting laps when you surface into a set.
The 5000 nit display is the brightest screen on this list by a wide margin, with a 1.47 inch face. That brightness is not only for sunny decks: it is what keeps a glance readable in open water where the sun hits the surface directly.
Built-in GPS provides path, elevation and pace guidance, and LTE lets you take calls and messages away from the phone. Voice-activated assistance responds without a wake phrase, and personalised hydration alerts suit long hot-weather swims.
The health side includes a Vitals app tracking five metrics during sleep with shift detection, and a single heart-health score with personalised guidance. Titanium construction and a two year warranty round out a very solid build.
At 2.08 ounces in a 47 mm case, it is heavy and oversized for a small wrist, and it is the heaviest item in this roundup. You are also best off pairing it with a Samsung Galaxy phone or another Android device for full functionality.
Why it suits most swimmers
Open water, snorkelling, cold water and any swim where you leave the lane are where the depth rating earns its keep. A watch that tells you how deep you went and when to stop is a different category of device.
Built-in GPS, cellular connectivity and a two year battery-backed package mean it also works as a standalone training watch on long expeditions. Owners single out the brightness, the 100 m rating and the dive computer as the deciding features.
Where it falls short
For lap swimmers this is a 47 mm titanium block on the wrist. The bulk can catch on the wall during a turn, and it is heavier than anything else we tested in a pool.
It is the most expensive watch here, works best with Android, and has a smaller owner review base than the Apple and Galaxy Watch 7 models. Choose it for water capability, not for the smartwatch feature list.
How to Choose a Fitness Tracker for Swimming
Water resistance: 5ATM versus 10ATM, and why IP ratings mislead
For ordinary lap swimming, 5ATM (50 metres) is enough. That rating means the device is rated to withstand pressure equivalent to 50 m of static depth, which covers pool sessions and casual open water. 10ATM (100 metres) is the level worth paying for if you swim outdoors in cold water, snorkel, dive or surf, because it tolerates repeated submersion and thermal shock.
IP ratings measure something different. IP67 means dust-tight and protected against temporary immersion in up to one metre of fresh water for 30 minutes, and IP68 allows deeper continuous immersion in water, but the depth is manufacturer-defined. IP69K, as on the Galaxy Watch Ultra2, is about high-pressure, high-temperature water jets. None of these is a swim specification, so treat IP as a durability note and ATM as the swim figure.
Pool or open water: the criteria actually change
In a pool, the deciding factors are lap counting reliability, stroke detection, a readable display between lengths and how the watch handles your kickboard or fins. Devices with dedicated pool swim modes and editable drills after the session will serve you best.
In open water, everything shifts to GPS quality, battery life in GPS mode, navigation features and durability. A watch that counts laps beautifully in a 25 m pool can wander badly across a lake, so decide where you actually swim before you spend.
What GPS does underwater, and why breaststroke tracks worse
GPS cannot work underwater. A receiver needs a clear view of satellites, and the moment your arm goes under, the fix is lost. In open water the watch holds a rough position from the last known fix and the compass, then draws a straight line to the next point where the arm surfaces.
That is why outdoor tracks look like a series of straight segments rather than a smooth curve, and why breaststroke records the worst result: your head stays down for most of the stroke cycle, so you surface far less often than a freestyler. Freestyle and butterfly open water swims track noticeably better for the same reason. Counting your surface recoveries per length is a useful technique for improving the track.
Lap counting, stroke detection and gear in the water
Pool lap counting works by reading wrist motion from an accelerometer and compass, detecting the turn at each wall and logging a length. Accuracy is high on clean freestyle sessions and degrades when equipment confuses the algorithm.
Fins, kickboards and pull buoys introduce large rhythmic signals that do not match a normal stroke, and a kick set can be logged as rest. Swim a set without gear first, add the kit after, and if a set reads as nonsense, edit the laps afterwards rather than trusting the number. Several devices also let you log drills separately so kick work does not distort your main set.
Heart rate sensors in water: wrist, chest strap and temple
On-wrist optical sensors struggle in swimming because the sensor is partly obscured by water and the constant motion of the arm produces noise. Devices that apply movement filtering, as the Galaxy Watch 7 does with its BioActive sensor, produce noticeably cleaner readings, but the gap does not close entirely.
For interval work where you need accuracy, a chest strap over the sternum is the reference, and most watches here support Ant+ or Bluetooth accessories. Temple-mounted sensors in smart goggles are the other strong option, reading the temporal artery where the signal is not fighting a moving limb. Treat wrist heart rate in the pool as a trend indicator rather than a laboratory measurement.
Battery in GPS mode is the number that matters
Marketing battery claims are measured in smartwatch mode, which tells you nothing about an open water swim. Compare hours in GPS mode instead: the COROS PACE Pro manages 38 hours outdoors, the COROS PACE 4 41 hours, the Suunto Race S 30 hours in performance mode, the Forerunner 265 20 hours and the Instinct 2 Solar 48 hours.
The smartwatch battery figures matter for wear consistency. The Vivoactive 5 runs up to 11 days and the Forerunner 265 up to 13, while the Apple Watch Series 11 manages 24 hours, the SE 3 18 hours and the Galaxy Watch 7 roughly 30 hours. If you want to swim and sleep in the same watch, longer is better.
Form factor: wrist watch, goggles, ring or clip-on
Wrist watches dominate because they log everything, but they are not the only option. Smart swim goggles put a heads-up display in your line of sight, which removes the need to look at your wrist mid-length and often carries a temple-mounted heart rate sensor. Rings track recovery metrics well and are effectively irrelevant underwater. Clip-on and fin sensors exist mainly for stroke technique feedback.
Whichever you pick, fit decides data quality. A tight wrist band, a correctly fitted nose piece and a stable goggle strap all reduce the noise the accelerometer has to filter, which is why a poorly fitted device can miss laps that a well fitted one counts cleanly.
How to train with the data once you have it
Start with pace per 100 m and compare like-for-like. Read your average pace for a 200 m, not your fastest 50 m, because the fast length tells you about your kick rather than your fitness.
Use SWOLF next. It adds your stroke count to your length time in seconds, and lower is better, so a session that drops from 42 to 38 shows efficiency improving even if pace held steady. Watch it across a whole set rather than a single length, because a tired technique inflates stroke count.
Heart rate zones turn a swim into a cardiovascular session. Swim three or four lengths in a lower zone to build aerobic base, then use a short block at higher intensity, and let recovery lengths bring the heart rate back down deliberately. A rest timer that vibrates at the end of each interval removes the guesswork.
Finally, treat the data as a trend. Compare sessions four weeks apart rather than this week against last week, because sleep, hydration and a busy fortnight at work move your numbers more than most training changes do. If a tracker makes you turn up and swim with a plan, it is doing its job.
Frequently Asked Questions
What does the water resistance rating mean on a fitness watch?
An ATM rating measures pressure resistance in metres of static depth. 5ATM (50 m) is sufficient for pool and casual open water swimming, while 10ATM (100 m) suits cold water, snorkelling, diving and surfing. IP ratings such as IP67 and IP68 measure dust and immersion protection instead, and the immersion depth is manufacturer-defined, so use the ATM figure for swimming decisions.
What is the best fitness tracker for swimming?
The Apple Watch Series 11 is the best all-round choice, with 50 m water resistance, reliable pool lap counting, open water GPS and a bright always-on display. The Garmin Forerunner 265 is better if swim data feeds a wider training system, and the Apple Watch SE 3 offers the same core swim tracking in a lighter case.
How do fitness trackers track swimming?
In a pool, the device reads motion from an accelerometer and compass to detect each wall turn and log a length, then pairs that data with an optical wrist heart rate sensor to record stroke type, pace and distance. In open water it uses GPS between arm recoveries, which is why the route looks jagged and why breaststroke outdoors records the least accurately.
Why does my swim watch count the wrong number of laps?
The most common causes are gear in the water and unedited drills. Fins, kickboards and pull buoys produce rhythmic signals that do not match a normal stroke, and a kick set can be logged as rest. Swim a set without gear first, log drills separately, and edit laps after the session rather than trusting a distorted automatic count.
How accurate are swim watches for tracking heart rate?
Wrist optical sensors are less accurate in water because the sensor is partly obscured and constant arm movement adds noise. Devices with movement filtering produce cleaner data, but a chest strap over the sternum remains the most accurate option for intervals, and temple-mounted sensors in smart goggles are the best wrist-free alternative. Most watches here support Ant+ or Bluetooth accessories.
Is GPS accurate for open water swimming?
GPS does not work underwater at all. The watch holds a rough position from its last fix and draws straight lines between points where the arm surfaces, so open water tracks look jagged. Accuracy improves with dual-band or multi-band GNSS and with swimming strokes that surface frequently, and battery life in GPS mode is the other number worth checking before a long swim.
Final Verdict for 2026
The Apple Watch Series 11 takes our overall pick among the best fitness trackers for swimming in 2026. It counts laps reliably, records open water, survives a 50 m rating and adds ECG and sleep data on a screen you can read poolside.
Pick the Garmin Forerunner 265 if swim data feeds a broader training system, the Vivoactive 5 if battery life matters more than polish, and the Galaxy Watch Ultra2 if you swim below the surface. Check the swim profile of whatever you choose before your first session, and give it four weeks before you judge the numbers.