If you are swimming for fitness, a waterproof tracker transforms your workouts. Whether you are swimming laps for beginners or training seriously, data makes a difference. Instead of guessing how many laps you swam or how hard you worked, you get actual data — lap counts, stroke type, pace per 100 meters, calories burned, and heart rate in the water.
Not every “waterproof” tracker actually works well for swimming. Some survive the water but cannot track swim metrics. Others track laps but their heart rate sensors fail when submerged. We tested five trackers that genuinely deliver for pool swimmers.
Whether you swim laps for exercise, do water aerobics, or train for triathlons, one of these will level up your water workouts.
What to Look For
Water Resistance Rating
Look for at least 5 ATM (50 meters). This means the watch survives pool swimming, showering, and surface water sports. 10 ATM (100 meters) handles everything including snorkeling and water skiing. WR100 or ISO 22810 certification is the gold standard. If you want to record what you see below the surface rather than just log it, an underwater camera is the natural companion purchase.
Do not confuse IP67/IP68 ratings (splash resistance) with true swim ratings. Many fitness trackers that claim “water resistance” cannot handle sustained immersion during laps.
Swim Tracking Features
The basics: lap count, stroke detection (freestyle, backstroke, breaststroke, butterfly), pace per lap, and total distance. Advanced features: SWOLF score (a measure of swim efficiency), stroke count, drill mode, and open water tracking with GPS.
Heart Rate in Water
Optical heart rate sensors on the wrist struggle underwater because water interferes with the light-based measurement. The best swim trackers use improved sensors and algorithms that deliver reasonable accuracy in the pool. None are perfect, but the gap is closing.
Battery Life
Swimming workouts are typically 30 to 90 minutes — check our guide on how many laps you should swim to plan your sessions. Any tracker handles that. The real question is total battery life between charges. If you swim daily, a watch that lasts 5+ days saves you from charging every night.
Comfort
You will wear this while doing physical activity in water. It needs to stay put without being tight. Silicone bands are the standard for swim watches — they do not absorb water and dry quickly.
How We Test These Trackers
Our approach here is a split, and we will be upfront about which is which. The swim testing we do ourselves — our founder is a former competitive swimmer, and lap-count accuracy, stroke detection, and how each screen behaves under wet fingers were all checked in the pool across freestyle and breaststroke sets. Heart-rate readings got spot-checked against a chest strap during those same sessions. What a few weeks in the water cannot verify — multi-year battery degradation, seal failures after hundreds of pool hours, how bands hold up to chlorine — we cross-referenced against verified owner reviews and each manufacturer’s water-resistance certification before settling on ratings.
Our Top 5 Swim Trackers
1. Apple Watch Ultra 3 - Best Overall
The Ultra 3 is the best smartwatch you can take swimming. It is water resistant to 100 meters, built with a rugged titanium case and sapphire crystal, and its larger display is easier to read mid-workout. Apple pitches it at swimmers, divers, and triathletes.
Apple’s swim workout mode counts laps, tracks pace, and estimates calories, and the Ultra 3 adds precision dual-frequency GPS for open water, Heart Rate Zones, and custom workouts.
Beyond swimming, it is a full-featured smartwatch with cellular, satellite communications, fall and crash detection, and up to 42 hours of battery in normal use (72 in Low Power Mode). It can also take an ECG and flag possible hypertension.
The price is steep. If you mainly need swim tracking, the Garmin vívoactive 5 covers the basics for a fraction of the cost. But if you want one device for everything, swim, run, bike, and daily wear, the Ultra 3 is unmatched.
Rating: 4.8/5
2. Garmin vívoactive 5 - Best Garmin for Swimmers
Garmin’s dedicated Swim 2 was not available new on Amazon when we last checked, and the vívoactive 5 is the Garmin we would buy in its place. It includes a swimming app among more than 30 built-in indoor and GPS sports apps, so it handles pool laps alongside running, cycling, HIIT, and more.
Battery life is excellent, up to 11 days in smartwatch mode, which is a big step up from daily-charge smartwatches. The bright AMOLED display is easy to read, and Garmin’s Body Battery, sleep score, and HRV status give you recovery data between swim sessions.
It is not as swim-specific as the Swim 2 was, but it covers lap swimming well and costs far less than a premium multisport watch. If you want a swim-capable Garmin for under $200, this is the pick.
Rating: 4.6/5
3. Fitbit Charge 6 — Best Value
The Charge 6 brings solid swim tracking to the most affordable price point on this list. It tracks laps, duration, and pace in a dedicated swim mode. Water resistant to 50 meters, it handles daily pool sessions without issue.
The heart rate sensor works in the water (with typical optical sensor limitations). The slim band design is the most comfortable option for all-day wear. Battery life is 7 days with normal use, which means less charging than any Apple Watch.
The swim data is less detailed than the Garmin or Apple — no stroke type auto-detection, no SWOLF, no drill mode. But if you just want to know how many laps you swam, your pace, and your heart rate, the Charge 6 covers it at a great price.
It also tracks running, cycling, and general fitness, making it a solid all-around tracker. For swimmers who are also doing water resistance exercises or general pool workouts, the Charge 6 is plenty.
Rating: 4.4/5
4. COROS PACE 3 — Best for Triathletes
The PACE 3 is a multisport GPS watch that handles swimming, cycling, and running at a competitive price. For swimming, it tracks pool laps with stroke detection, SWOLF, pace, and distance. Open water mode uses GPS for distance tracking.
What sets it apart for triathletes is the seamless sport transition feature. Tap one button to switch from swim to bike to run during a race. The watch logs each segment separately and provides combined stats at the end.
Battery life is the best on this list — up to 24 days in watch mode and 38 hours with full GPS. For athletes who train daily across multiple sports, going weeks between charges is a legitimate advantage.
The watch face is basic and the app ecosystem is smaller than Apple or Garmin. But for pure athletic tracking at this price, the COROS PACE 3 delivers exceptional value.
Rating: 4.6/5
5. Apple Watch SE 3 - Best Budget Apple Watch
If you want the Apple Watch swimming experience without the Ultra price, the SE 3 delivers most of it. It runs the same workout tracking as the more expensive Apple watches, including lap counting, pace, and calories, and it adds temperature sensing, sleep score, and fall and crash detection.
The main differences from the Ultra are a smaller, less rugged aluminum case and shorter battery life. For pool swimming, those matter less than you might think.
Battery life is rated at 18 hours, which means daily charging, but it charges up to twice as fast as the SE 2, with up to 8 hours of battery from a 15-minute charge. If you are already in the Apple ecosystem and want a swim-capable smartwatch at a reasonable price, the SE is the entry point.
Pairs well with swim goggles for a complete lap swimming setup.
Rating: 4.5/5
Taking Care of Your Swim Tracker
- Rinse with fresh water after every swim. Chlorine and salt corrode metal contacts and degrade rubber seals over time.
- Do not press buttons underwater unless the manual says you can. Button presses can force water past seals.
- Dry thoroughly before charging. Water on the charging contacts can cause issues or corrosion.
- Replace bands periodically. Silicone bands degrade with chlorine exposure. Replace them annually for best results.
Frequently Asked Questions
Can I wear my fitness tracker in a chlorinated pool?
All five options on this list are rated for pool use. Chlorine can degrade materials over time, so rinse the watch with fresh water after each swim. Avoid wearing it in hot tubs — the combination of heat and chemicals is harsher than pool swimming.
How accurate is wrist-based heart rate in water?
Roughly 85 to 95 percent accurate compared to a chest strap, depending on the watch and how tightly you wear it. For serious training zones, consider pairing with a waterproof chest strap heart rate monitor.
Do swim trackers work for water volleyball?
They track general activity, heart rate, and calories during water sports, but they will not track volleyball-specific metrics. Most watches classify water volleyball as a generic “water sport” or “pool workout.” You will get time, heart rate, and calorie data but not sport-specific stats.
Can I swim in the ocean with these trackers?
Yes. All five are rated for pool and open water swimming. The COROS PACE 3 and Apple Watch Ultra 3 also have GPS-based open water swim tracking that maps your route and measures distance accurately. Rinse with fresh water after saltwater exposure.
How do swim trackers count laps?
They use accelerometers to detect the push-off and turn at each wall. Most are accurate within 1 to 2 laps per session. Set your pool length correctly in the watch settings for best results.
