01
Set the tempo
Set from 0.50–10.00s (from 0.15s in sub-0.5s mode) — fast enough for kick tempos. Switch between 0.05s and 0.01s steps, with press-and-hold to dial in fast.
For solo swim practice
Tempo slips while you swim.
Whether you're sprinting or doing repeats, it's hard to tell underwater whether your stroke sped up or slowed down. Swim Tempo Trainer gives your body a steady beat to anchor your rhythm against.
How it works
Three simple steps.
02
Tuck it in your cap
Take the watch off its band and place the body inside your swim cap, near the back or side of your head.
03
Swim to the beat
The beat starts after a 3-2-1 countdown (3–60s, selectable). Hold the stop button for 1 second to avoid accidental taps.
Cap position
Hear and feel it underwater.
Take the watch off its band and place just the body inside your swim cap. Kept close to your head — near the back or side — the beep and vibration come through clearly even underwater.
Features
Only what swim-tempo practice needs.
Works on watchOS 26.2+. Settings stay on your Apple Watch — no network, analytics or ads. At very fast tempos the beat may fluctuate slightly.
Apple Watch only
Start tempo practice with just the Watch you own — no extra device to buy.
Sound built to carry underwater
An original beep tuned to be heard underwater — choose from 3, with adjustable volume.
Seconds or SPM
Read and set tempo in seconds per beat or in SPM (strokes per minute) — whichever unit you think in.
Optional vibration
Add a light buzz on each beat for a tactile backup when sound is hard to hear.
Tempo templates
Save the tempos you use most — stroke, kick — and recall them in a tap.
Japanese / English
Switch language in the app — easy for teams and travel.
Range
0.50–10.00
seconds per beat
Sounds
3 tones
choose from 3
Stop
1 sec
hold-to-stop prevents mistakes
Why one Watch is enough
No extra device.
A dedicated tempo device
Swim Tempo Trainer
Extra device
Required
None — the Apple Watch you own
Tones & volume
Limited
3 tones + volume
Vibration
Varies
Optional, on every beat
Save tempos
Varies
Saved as templates
Language
—
Japanese / English
FAQ
Frequently asked.
Can I wear it on my wrist?
You can, but underwater the sound is muffled and distant, so we recommend tucking the watch body inside your swim cap.
Is HealthKit data stored?
We start a workout session so the tempo keeps playing while you swim, but we don't store or transmit any health data.
Is there an App Store link yet?
It's coming soon. Once it's live, the buttons here will link to the App Store.
Roadmap
A new mode in the works.
v1.1 in development
Time-Sense mode
After a countdown, a beep every second plus a strong accent at your target split (e.g. 6s at the 15m mark). Feel whether you're ahead of or behind your goal — pace-sense training.
This feature is in development. Details and timing may change.
Lock your stroke tempo into your body.
Swim Tempo Trainer is coming to the App Store. Once it's live, you'll be able to download it right from this page.
Coming to the App StoreContact us