Will my screen stay awake?

Keep screen on requests a screen wake lock when supported. Its status reflects the actual lock; browser or device interruptions can release it.

Can I save my settings?

Save named routines in this browser, then load, rename or delete them locally. Existing presets and custom durations remain available.

Interval / HIIT Timer

Set repeating work and rest intervals.

Work

00:20

Next: Rest · 00:10

Round 1 of 8 Set 1 of 1

Total planned04:00

Workout remaining04:00

Ready to start.

Audio controls

Voice Alarm sound Alarm volume 60% Voice volume 80% Mute all audio

Audio is enabled by Start or Preview. Background playback depends on your browser and device.

Keep screen on

Workout settings and saved routines

Duration, preset and routine edits are available before starting. Reset an active workout to edit it.

Warmup (seconds) Work (seconds) Rest (seconds) Rounds per set Sets Set rest (seconds)

Preparation countdown Preparation (seconds)

Include rest after the final work interval of each set

Preparation runs once, before warmup and the first work interval. Round rest follows each work interval when enabled; set rest is additional between sets. The total includes every enabled phase.

At each phase boundary

Saved routines

Names and settings stay in this browser. Save up to 20 routines.

Routine name Saved routine

Timing, audio and keyboard options

Use whole seconds, up to 100 rounds per set and 20 sets. Preparation is 1–60 seconds; the full plan must fit within 24 hours. Round indicators show the current round and endpoints for long plans.

Pause keeps the exact remaining time. Skip advances one phase without counting the remaining time; Reset cancels the workout and returns to ready. Repeat workout starts the same plan again.

With Alarm until stopped, each finished phase waits for Silence and continue. That waiting time is excluded from the workout remaining. Skip also acknowledges that boundary and advances once.

Space starts, pauses or resumes; N skips; R resets. Shortcuts do not interrupt typing or button controls. Workout view keeps timing and live audio controls prominent; Fullscreen is available where your browser supports it.

Timers reconcile elapsed time when callbacks are delayed, but browser backgrounding, screen locks and interruptions may prevent timely audio. Keep the page visible when dependable cues matter. Device voices and keeping the screen on depend on your browser.

Help & FAQ — Interval / HIIT Timer

How to use

Set warmup, work, rest and between-set rest durations.
Choose the number of rounds, sets, and voice/sound options.
Start Workout view, pause or skip when needed, and use Repeat workout after completion.

Use cases

Run HIIT workout intervals with rest periods.
Set repeating timers for study blocks.

Tips & FAQs

Will my screen stay awake?: Keep screen on requests a screen wake lock when supported. Its status reflects the actual lock; browser or device interruptions can release it.
Can I save my settings?: Save named routines in this browser, then load, rename or delete them locally. Existing presets and custom durations remain available.

Formats & limits

Audio is optional; enable playback with a user interaction
Timing reconciles delayed callbacks, but background alarms are not guaranteed
Screen wake lock and fullscreen depend on browser support

Privacy

All configuration stays in your browser; nothing is uploaded.

Related tools

Updated

11 October 2026