Workout Interval Timer — Tabata & HIIT Work/Rest Rounds
Who this is for: For home workouts, garage gyms, and trainers who want Tabata-style timing without installing an app — phone propped against a water bottle, laptop at the end of the mat, TV browser in the living room.
Not the right tool for: Open-ended training logs — this times phases; it doesn't record sets, weights, or history · Music-synced workouts — it beeps but doesn't play or sync tracks
A Tabata and HIIT interval timer in your browser — work/rest phases, round counter, and beeps on every switch. No app, works full-screen on any device.
Quick answer: A workout interval timer alternates work and rest phases across your rounds with a beep at every switch — the Tabata classic is 20 s work / 10 s rest for 8 rounds (4 minutes). Set your phases below or use the preset.
| Presets | Tabata 20/10 × 8 preloaded |
|---|---|
| Custom | Any work/rest seconds, 1–50 rounds |
| Cues | Beep at every phase switch + finish |
| Account | None — free, no signup |
How the interval timer runs a session
A session is a queue of phases: an optional get-ready countdown, then alternating work and rest for as many rounds as you set — the classic Tabata is 20 seconds work, 10 seconds rest, 8 rounds, preloaded below. A beep marks every switch so you can keep eyes off the screen, the current phase and round stay in giant type, and the total session time is shown before you start. It anchors on the device clock, so a phone call or locked screen mid-workout never costs you seconds.
Common uses
- Tabata (20/10 × 8) and classic HIIT circuits
- Bodyweight and kettlebell rounds at home
- Station-based training with fixed work periods
- Partner workouts where one clock rules both athletes