90 minute timer
Counts down 1 hr 30 min, then beeps.
Space start/pause R reset Esc stop
Settings
Counts down 1 hr 30 min, then beeps.
01
What this one is for
A 90 minute timer matches the ultradian rhythm, the roughly ninety minute cycle your brain runs through before it wants a real break. Work with it and the afternoon slump makes more sense.
Ninety minutes is also one sleep cycle, the ninety minutes of a football match, and about the length of a film that respects your time.
Space starts and pauses. The tab title shows the remaining time and a beep lands at zero.
02
Good for
- An ultradian deep work cycle
- One sleep cycle
- Ninety minutes of a match
- Long exam practice papers
03
How it runs
Counts down 1 hr 30 min, then beeps. Press Start, or hit Space. The digits turn green while a work block runs and grey on rest.
Sound is on by default: a rising pair for work, a falling pair for rest, a tick for the last three seconds and a three-note finish. Mute with the speaker button. The screen stays on while the timer runs and the tab title shows the time left.
Change anything in Settings under the timer. The last setup you used on this page is remembered in your browser.
Questions people ask
- What is a 90 minute work cycle?
- The ultradian rhythm is a roughly ninety minute cycle of alertness. Working in ninety minute blocks with a proper break after tends to match it.
- Will it still beep after an hour and a half in the background?
- The countdown is tracked from timestamps so long durations stay accurate. The beep plays while the tab is open, or as soon as you switch back.
- Can I change the duration?
- Yes, set any length on the timer, or use the 60 minute page.
- Do I need an account?
- No. No login, and it works offline after the first load.