What the tool does, how to run it, and what to expect from the result.
Ninety minutes matches one sleep cycle and the ultradian rhythm many deep-work routines are built around. The page loads with the countdown already set, so the whole interaction is one click.
The timer runs on the browser clock, not a server, so it works offline once the page is open and it keeps counting in a background tab. At zero it plays a short chime; keep the tab unmuted if you plan to walk away.
A quick way to understand who this helps, what it solves, and where it connects next.
Anyone timing deep work and sleep cycles to 90 minutes
Starting a 90 minutes countdown in one click
Short answers for the questions people usually have before trying a utility like this.
You just did: this page loads with 90 minutes on the clock. Press Start. If you need a different duration, change the minutes field or use the full countdown timer.
Yes. The countdown keeps running in a background tab and the chime plays at zero, as long as the tab is not muted by the browser.
Yes. Once the page is open it needs nothing from the network; time comes from your own device.
Nearby tools from the catalog that fit the same job or workflow.
One-click 1 minute countdown
A 1 minute countdown, loaded and ready to start, with a chime at zero.
One-click 10 minute countdown
A 10 minutes countdown, loaded and ready to start, with a chime at zero.
One-click 12 minute countdown
A 12 minutes countdown, loaded and ready to start, with a chime at zero.
One-click 15 minute countdown
A 15 minutes countdown, loaded and ready to start, with a chime at zero.
One-click 2 minute countdown
A 2 minutes countdown, loaded and ready to start, with a chime at zero.
One-click 20 minute countdown
A 20 minutes countdown, loaded and ready to start, with a chime at zero.
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Runs entirely in your browser. Nothing is uploaded and no account is needed.
01:30:00
Timing runs locally in your browser tab.