ALARM IN 20 MINUTES
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Current Time
Your Alarms
You don't have any alarms yet.
You've landed on the alarm in 20 minutes page. What does that mean? When you press "Set alarm", we automatically calculate what time it will be 20 minutes from now and schedule the alert for that exact moment. No mental math, no clock-watching.
What is an alarm in 20 minutes good for?
20 minutes is the exact nap length NASA recommends to recover alertness without entering deep sleep. It is also the standard coffee-nap duration: you drink the coffee right before sleeping and the caffeine kicks in when the alarm rings.
How is it different from a 20 minutes timer?
The 20-minute timer counts down. This relative alarm calculates the exact time 20 minutes from now. Same duration, different way of thinking about time.
How it works
- Open this page. The widget above already knows you want a relative alarm.
- Press "Set alarm". The system calculates the current time + 20 minutes.
- When the moment arrives, the alarm rings. You can snooze it or dismiss it.
Frequently asked questions
Will the alarm ring if the tab is in the background?
Yes, the alarm rings even if the tab is in the background or minimized, as long as the browser stays open. The internal tick uses absolute timestamps rather than counters, so it survives background tab throttling.
What is the difference between an alarm in 20 minutes and a timer?
An alarm in 20 minutes calculates the exact time it will ring (current time + 20 minutes) and alerts you at that clock time, like an alarm clock. A timer counts down 20 minutes regardless of what time it is. If you want to know "at what exact time will it ring?", use this page. If you prefer watching a countdown, use the timer.
If I set an alarm for 20 minutes from now, will it keep working if I switch tabs?
Yes. The alarm uses the system clock and absolute timestamps, not a counter that stalls when you switch tabs. As long as the browser stays open, the alarm will ring even if the tab is not visible.