A free alarm clock that runs in your browser. Set a time, leave the tab open, and it rings — no app, no account, no sign-up.
A web alarm is not a phone alarm. It only works while the page is still open. Close the tab, quit the browser, or shut the laptop and it will not wake you — nothing is running any more.
If the computer goes to sleep, the page freezes along with everything else. The alarm fires as soon as the machine wakes up, but it will not wake the machine for you. Plug in and turn sleep off if the alarm really matters.
Phones are stricter still: iOS Safari and most Android browsers suspend background tabs after a while, and locking the screen usually ends the page entirely. Use the built-in clock app if you are relying on this to get up.
What does survive: switching to another tab, minimising the window, and losing your internet connection. The ringtone is already loaded and the countdown is computed from your device clock, so none of those stop it.
Set the time, give it a label, then press Test in settings to confirm the volume is audible. Check the system volume too — the browser cannot play louder than that.
Turn the brightness down and go fullscreen so the digits are the only light in the room. They change once a minute, so the screen stays calm while you fall asleep.
Keep the device plugged in. Holding the screen awake costs battery, and so does the background keep-alive.
Use this one for short-term reminders while you are at a desk: a meeting in twenty minutes, a reminder to take something out of the oven, a nudge to stand up. It is already open, needs no install, and behaves the same on every platform.
Do not make it your only wake-up alarm. A phone alarm keeps ringing when the app is closed, the screen is locked, and the network is gone. A browser alarm cannot promise any of that.
Want it to ring in an exact number of minutes instead?
No. Closing the tab stops everything — the alarm only runs while the page is open. Keep the tab or window open, and ideally keep the device plugged in.
Yes. Background tabs keep running, and while the alarm is pending this page plays the ringtone at a very low volume so the browser does not throttle its timers. If you turn that option off, the alarm can be up to a minute late.
Yes. The page and the ringtone are already loaded and the countdown is calculated from your device clock, so losing the connection does not affect it.
No. Nothing running in a browser can wake a sleeping machine. The alarm fires the moment the computer wakes up, which may be too late.
This page holds a single alarm on purpose. If you need a second one, open the page in another tab — each tab keeps its own alarm.
Yes. When the alarm rings you get Snooze, set to 5 minutes by default. You can change it to 1, 5, 10 or 15 minutes in settings.
In this browser, on this device, in local storage. It is never uploaded and does not follow you to another device. Clearing site data removes it.