← All projects

Trainbell

HIIT & Tabata interval timer. No subscription, no account, no ads mid-workout.

Get it on Google Play ↗
Released
August 31, 2026
Available on
Android
Category
Fitness

Screenshots

  • The work phase of an 8 round workout on a full-screen green timer: 18 seconds left, with skip, add ten seconds and pause controls
  • The setup screen for an 8 round workout: prep 10 seconds, work 20 seconds, rest 10 seconds, rounds 8, and a Start button
  • The rest phase on a full-screen blue timer: 7 seconds left, round 1 of 8, next up is work
  • The lock screen with a Trainbell notification that keeps counting the workout while the screen is off: Work, 14 seconds, round 3 of 8
  • Cue settings: sound, vibration only, screen flash or silent, with cue volume, sound pack, 3-2-1 countdown and half-way cue switches
  • The presets list with Tabata, EMOM 10, Boxing rounds, Gym rest timer and Stretching, and buttons to export and import presets
  • Settings with the colour theme choices Default, Forest, Ocean, Ember and Midnight
  • The Trainbell Pro screen: one price, one time, no subscription, with unlimited presets, all sound packs, voice cues, extra themes and no banner

1 of 8

What Trainbell is for

The interval timer that stays out of your way.

Trainbell is a distraction-free interval timer for HIIT, Tabata, boxing rounds, EMOMs, circuits, and other interval-based workouts, with no ads, accounts, subscriptions, or network tracking. Its simple setup lets you start a workout in seconds by entering prep, work, rest, and rounds, while advanced options remain hidden until you need them. The timer keeps running accurately with the screen off, survives app interruptions, and offers customizable audio, voice, vibration, and visual cues that work seamlessly alongside your music or podcasts. All presets and data stay on your device, giving you full control and privacy without relying on cloud services.

Use cases

  • HIIT and Tabata: Enter prep, work, rest and rounds and start in seconds.
  • Boxing rounds, EMOMs and circuits: Any workout built from timed intervals.
  • Training with the phone locked: The timer keeps running with the screen off, with lock-screen controls.
  • Training to music: Audio, voice, vibration and visual cues work alongside your music or podcast.

What it does

  • 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
  • Beeps with a 3-2-1 countdown and a half-way cue
  • Vibration-only and screen-flash modes
  • Separate cue volume and Bluetooth cue delay
  • Five saved presets, and export or import them to a file whenever you like
  • Dark theme, and a colour theme that follows your system setting