Roundbell
A Tabata and interval timer with no ads and a proper Wear OS watch app. Pick Tabata, EMOM, AMRAP or your own rounds, press start, and train: a countdown you can read from across the room, a 3-2-1 beep, a voice that calls the round, and a buzz on your wrist at every change.
Ready in one tap
Tabata, EMOM, AMRAP, HIIT 40/20 and boxing rounds are built in. Tweak rounds, work, rest, sets, warm-up and cool-down with big +/− buttons, or just start.
Runs on your wrist
Start, pause and skip from your watch, with different vibrations for work and rest. The watch app works on its own, so the phone can stay in your bag.
Tile and Ongoing Activity
Start your favourite workout from a Tile, and get back to the running timer from the watch face.
Keeps time, screen off
Built on the system clock rather than a ticking counter, so a 20-minute session ends on the second, through pauses, a locked screen or Android closing the app.
Cues that work with music
Beeps, a bell, a voice and vibration, each switchable. Your music ducks under the voice instead of stopping.
Syncs phone and watch
Save a workout on your phone and it's on your watch a moment later, and the other way round.
Free and Pro
- Free: every timer feature, the watch app, presets and three saved workouts. No ads, no account.
- Pro (£2.49, one payment through Google Play): unlimited saved workouts, logging every finished workout (phone or watch) to Health Connect, and your own bell sound.
What you need
- An Android phone on Android 8 or later.
- Optional: a Wear OS 3 or later watch (Pixel Watch, Galaxy Watch 4 or later, and others). Install Roundbell on the watch from Google Play.
Coming from another interval timer?
If your current timer shows ads between rounds or hasn't had an update in a while, see Tabata timers without ads in 2026.
Troubleshooting
- No sound with the screen off: allow Roundbell's notification when asked; some phones also need battery optimisation turned off for Roundbell.
- Workouts don't appear on the watch: open Roundbell on both devices once while they're connected.
- Health Connect switch does nothing: install or update Health Connect from Google Play, then try again.
Privacy
Roundbell runs on your devices. No account, no ads and no tracking. See the Roundbell privacy policy.
Questions or bugs: admin@onibaku.co.uk. We reply within two working days.