Trainbell: HIIT & Tabata Timer

Trainbell is a HIIT timer and Tabata timer that stays out of your way. Set prep, work, rest and rounds, press Start, and train. No ads on the timer screen, no account, no subscription.

THE INTERVAL TIMER THAT NEVER INTERRUPTS YOU

During a workout, an interval timer should do exactly one thing. Trainbell keeps counting with the screen off, never shows an ad mid-workout, and keeps your presets on your phone.

SET UP A WORKOUT IN SECONDS

Four numbers and a Start button: prep, work, rest, rounds. That is the whole home screen. Sets, rest between sets and a cool-down sit under More options, folded away until you need them. Hold + or - to jump in big steps instead of tapping twenty times.

BUILT TO BE READ MID-EFFORT

Every phase gets its own full-screen colour, so one glance from across the gym tells you where you are. Giant digits that do not jitter. The next phase is always on screen so you can pace the last few seconds. Tap anywhere to pause, no hunting for a small button with sweaty hands.

A WORKOUT TIMER THAT RUNS WITH THE SCREEN OFF

The most common complaint about interval timers is that they die in your pocket. Trainbell runs as a foreground service with lock-screen controls, and every deadline comes from the system clock, so it cannot drift. Pocket your phone mid-round and every cue still lands on time.

CUES THAT CUT THROUGH YOUR MUSIC

Cues duck your music or podcast for a moment and hand it straight back, never pausing it. Cue volume has its own slider, separate from media volume. Choose beeps, a spoken phase name, vibration only, or a screen flash for silent gyms. A Bluetooth delay setting makes cues land on the phase change with wireless headphones.

ONE TIMER FOR EVERY KIND OF TRAINING

- Tabata timer: set 20 seconds work, 10 seconds rest, 8 rounds in seconds

- HIIT timer for any work and rest split

- Boxing timer and round timer for heavy bag, sparring and MMA rounds

- EMOM timer and AMRAP blocks

- Circuit training timer with sets and rest between sets

- Run walk timer and sprint intervals

- Gym rest timer between sets

- Stretching and mobility timer

WHAT YOU GET FREE

- Prep, work, rest, rounds, sets, rest between sets, cool-down

- Full-screen phase colours, tap to pause, skip forward and back, add ten seconds

- Runs with the screen off, with lock-screen controls

- 3-2-1 countdown and a half-way cue

- Vibration-only and screen-flash modes

- Separate cue volume and Bluetooth cue delay

- Five saved HIIT and Tabata presets, with export and import to a file

- Dark theme, and a theme that follows your system setting

TRAINBELL PRO: ONE PRICE, ONCE

Not per month. The interval timer itself stays free forever, with unlimited workouts and no time limit. Pro adds unlimited saved presets, spoken voice cues, every sound pack, four extra colour themes, and removes the single banner from the setup screen.

ABOUT ADS

Trainbell shows one banner, on the setup screen, and only in the free version. No ads on the timer screen, no full-screen ads, no ads on launch, no ads with sound. Not now and not in a later update.

YOUR DATA STAYS ON YOUR PHONE

No account. No sign-in. No analytics. The app makes no network calls of its own. Your presets live on the device and export to a file you control.

Trainbell is a timer, not medical advice. Consult a professional before starting a new exercise programme.