A timer that reminds you to stand up, or to rest your eyes, at an interval you choose. It runs in this tab, keeps nothing, and makes no claim that any particular interval protects you.
A reminder to stand up, or to look away from the screen, at an interval you choose. It runs in this tab. It makes no claim that any particular interval prevents harm, because no trial has shown one does.
How to read this
Whole minutes. There is no evidence-based correct number, so use whatever you will actually keep to.
30:00
Breaks taken today: 0. Counted in this browser only, reset each day.
There is no correct number here. No official body has set an interval at which standing up protects you, and our own review of the sitting-break research could not find one. Thirty minutes is a common choice, not a proven dose. The 20-minute option is the eye-rest habit the American Optometric Association describes: “take a 20-second break to view something 20 feet away every 20 minutes.”
Eye-rest rule: American Optometric Association, Computer Vision Syndrome. Background on break intervals: How Often Should You Get Up From Sitting?
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Read this before you trust the number
This is a habit prompt, not a treatment. No official body has set an interval at which standing up prevents harm, and our review of the sitting-break research could not find one either. Thirty minutes is a common choice, not a proven dose, so the interval is yours to set.
The 20-minute option is the American Optometric Association eye-rest rule, offered for comfort during screen work. If you have pain, numbness, or a health condition, that is a conversation with a clinician rather than a timer. See the medical disclaimer.
Why there is no correct interval
Almost every “stand up every X minutes” figure you have seen was picked for being round, not for being tested. The research on breaking up sitting is genuinely unsettled, and no health authority publishes a protective interval. So this tool does not pretend to know one. It lets you set a reminder you will actually keep, which is the part that matters.
Common questions
Does standing up every 30 minutes prevent the harms of sitting?
Nobody has shown that a specific interval does. Moving more across the day is sensible, but the exact timing is not settled by evidence, so treat the number as a nudge rather than a dose.
Will it keep running if I switch tabs?
It keeps counting while the tab is open. If your browser throttles background tabs the countdown can drift, and if you close the tab it stops. It is a lightweight reminder, not a background service.
What is the 20-20-20 option?
It is the American Optometric Association eye-rest habit: every 20 minutes, take a 20-second break to look at something about 20 feet away. It is aimed at screen comfort, not at sitting.