# A 90 minute timer

> A free 90 minute timer that runs over an animated snowfall scene, with optional rain, fire or ocean sounds. Opens ready to start, works offline, no account.

Source: https://timerz-app.vercel.app/90-minute-timer · Open the app with the 90 minute countdown: https://timerz-app.vercel.app/?scene=snow&minutes=90 · Last updated 2026-09-24

The button above opens timerz at 90:00 over the Snowfall scene. Press Space to start.

Ninety minutes is the length of a long deep work block, one sleep cycle, or a movie. People who work in 90 minute blocks usually do two or three per day for their hardest work and take a real break of 20 minutes or more in between.

A block this long needs a clear task. Write it in the tasks panel before you start, turn off notifications you do not need, and pick a sound you can forget about, like rain or brown noise.

## How to use it

1. Open the timer with the button at the top of this page. It starts paused at 90:00.
2. Press Space or the play button to start, and Space again to pause.
3. Turn on ambient sounds with A, or pick music from YouTube in the music panel.
4. When it ends, the chime plays and the tab title blinks until you come back. Press Space to run it again.

## Questions

### Why 90 minute work blocks?

The idea comes from the ultradian rhythm, a cycle of roughly 90 minutes of higher and lower alertness during the day. The evidence for it at work is thin, but many people find that 90 minutes is the longest block they can sustain with a real break after it.

### Is timerz free?

Yes. Every scene, sound and feature is free, with no account and no ads. If it helps you, you can leave a tip on Ko-fi, or become a supporter once (pay what you want, from 5 dollars, on Gumroad) to unlock your own photo as a scene and two extra fonts. There is no subscription.

### Does timerz work offline?

Yes. timerz is a progressive web app. After the first visit the app, its scenes and sounds are cached, and you can install it on your desktop or phone. Only the YouTube music needs internet.

### Where is my data stored?

In your browser, using localStorage. Settings, tasks and session history never leave your device. There is no server and nothing to sign up for. You can export your history as JSON or erase everything from settings.

### Does the timer keep running if I switch tabs?

Yes. The timer stores when it started and derives the remaining time from the clock, so a background tab, a sleeping laptop or a page reload do not make it drift. The remaining time also shows in the tab title.

## More

- [An aesthetic focus timer, made for one person first](https://timerz-app.vercel.app/about)
- [A pomodoro timer with rain sounds](https://timerz-app.vercel.app/pomodoro-timer-with-rain-sounds)
- [An aesthetic study timer you actually want to look at](https://timerz-app.vercel.app/aesthetic-study-timer)
- [A fireplace pomodoro timer](https://timerz-app.vercel.app/fireplace-pomodoro-timer)
- [A focus timer under the sea](https://timerz-app.vercel.app/underwater-focus-timer)
- [A pomodoro timer with an ambient sound mixer](https://timerz-app.vercel.app/pomodoro-timer-with-ambient-sounds)
- [A 5 minute timer](https://timerz-app.vercel.app/5-minute-timer)
- [A 10 minute timer](https://timerz-app.vercel.app/10-minute-timer)
- [A 15 minute timer](https://timerz-app.vercel.app/15-minute-timer)
- [A 20 minute timer](https://timerz-app.vercel.app/20-minute-timer)
- [A 25 minute timer](https://timerz-app.vercel.app/25-minute-timer)
- [A 30 minute timer](https://timerz-app.vercel.app/30-minute-timer)
- [A 45 minute timer](https://timerz-app.vercel.app/45-minute-timer)
- [A 1 hour timer](https://timerz-app.vercel.app/1-hour-timer)