Train smarter.
Swim faster.

Yes, and tracking is the part that's free. SwimTune records your swims on Apple Watch with automatic lap counting and stroke type detection, or imports swims already sitting in Apple Health, including ones recorded on a Garmin. You get a full swim log with splits, stroke rate, SWOLF, distance per stroke, heart rate zones and pace per 100m, plus long-term trends and training load, without paying anything.

Where it stops being just a tracker is what happens next: SwimTune reads that history and writes your next workout from it. See exactly what gets tracked.

SwimTune runs on Apple Watch and iPhone. The Apple Watch app records pool and open water swims live; the iPhone app handles planning, analysis and the AI coach.

If you swim with a Garmin today, your swims already flow into SwimTune as long as Garmin Connect writes them to Apple Health: they import with the right venue, distance and splits. A native Garmin watch app is in development and planned for fall 2026, with Google Wear OS and Google Health Connect to follow.

SwimTune tracks 12+ swim metrics automatically via your Apple Watch including: stroke rate, split times, SWOLF score, distance per stroke (DPS), heart rate and heart rate zones, lap count, pace per 100m, stroke count, rest intervals, and training load. It also integrates health data like sleep quality, HRV, and resting heart rate to calculate a daily recovery score.

CSS (Critical Swim Speed) is a measure of your aerobic swim threshold, the fastest pace you can sustain for 20 to 30 minutes. It's the swimming equivalent of FTP in cycling. SwimTune walks you through a guided CSS test (a 400m and a 200m time trial, or a simplified 200m/100m version) and turns the result into five training pace zones: Recovery, Aerobic, Threshold, VO2max and Sprint. For beginners, the CSS test is introduced gradually around weeks 6-8 once sufficient fitness is built. For intermediate and advanced swimmers, it's part of the initial baseline testing. Full guide to CSS testing and pace zones.

For the swim leg, yes. SwimTune is a swimming app, not a triathlon app: there's no bike or run training in it, and it won't build you a full multisport plan. What it does cover is the discipline most triathletes are weakest at. Set an open water goal, add your race with a custom distance (1.9km for a 70.3, 3.8km for a full, 750m or 1500m for sprint and Olympic), and your plan builds continuous swimming, sighting and pacing toward that date, with the taper handled for you.

If you already track bike and run elsewhere, SwimTune slots in as the swim-specific layer. Read the triathlon swim training guide.

You add your races to a calendar and mark each one A, B or C: an A race is the one the season is built around, B races matter but aren't the goal, C races are training. Your plan then reshapes itself around those dates, including the taper, so volume comes down at the right time without you having to guess.

On race morning the app recognises it's race day and gives you a warm-up, a pacing plan and a checklist. Afterwards you log your final time, your splits and how the race actually felt, which feeds back into what the plan does next. Pool events (50m to 1500m, all four strokes and IM) and open water events (1500m to 10km, or any custom distance) are both supported.

The Swim Score tracks your progress across pace, efficiency, consistency, and volume. It counts only swims recorded since you created your profile: imported history doesn’t inflate it: and it shows a dash rather than an invented number until there is enough data to score.

Yes. SwimTune is on the App Store for iPhone and Apple Watch: download it here. Recording, importing, history and analytics are free; SwimTune Pro unlocks the AI coach and adaptive plans with a 7-day free trial. Native Garmin support is planned for fall 2026.