Online alarm clock
Set unlimited alarms directly in your browser with no app or sign-in required. Each alarm shows a live countdown and plays a chime when it fires.
What is the Online Alarm Clock?
A no-signup alarm clock for browser tabs. Set as many alarms as you want, each with an optional label, and see a live countdown until they ring. Grant notification permission and you'll get a desktop alert even if this tab is in the background. For the alarm to ring, keep this tab open in your browser — it won't fire if the tab is closed.
Common Uses
- Early morning departures: Set a reliable alarm for flights, trains, or long drives where missing the start time has serious consequences.
- Power naps: The scientifically optimal nap is 10–20 minutes — set a precise alarm to wake before entering deep sleep and feeling groggy.
- Medication reminders: Many medications must be taken at exact intervals; a browser alarm works on any device without installing an app.
- Study and focus blocks: Set an alarm to end a deep-focus session so you never lose track of time during exam preparation or project work.
- Interview and meeting alerts: Use an alarm as a 15-minute pre-meeting buffer to review notes and ensure you're never late to important calls.
- Cooking and kitchen timing: Multiple kitchen timers without extra hardware — set separate alarms for the oven, stove, and resting meat simultaneously.
- Workout interval training: Set alarms to signal rest and activity intervals during HIIT or circuit training sessions.
- Waking guests in different time zones: Share a browser link for a pre-set alarm with remote guests — no app download or device configuration needed.
FAQ
Will alarms fire if I close the tab?
No. Alarms live in this page, so closing the tab will stop them. Keep the tab open — most browsers allow background tabs to play audio and show notifications. For system-level alarms, use your phone or OS clock.
Are my alarms saved?
Alarms exist only while this tab is open. Refreshing or closing the page clears them. Nothing is stored on any server — everything runs locally.
Can I add multiple alarms?
Yes — add as many as you like. Each shows its time, label, and a live countdown. Use the toggle to disable an alarm without deleting it, and the × button to remove it entirely.
Does the alarm clock store my data?
No. Alarm settings exist only in the browser tab's memory. Nothing is saved to a server or to your device's storage.
Can I customize the alarm sound?
The alarm uses a built-in audio chime that plays directly in your browser. No custom sounds are supported at this time.
By the Numbers
- Adults need 7–9 hours of sleep per night to maintain optimal health (American Academy of Sleep Medicine)
- 35% of U.S. adults report sleeping fewer than 7 hours per night (CDC, 2022)
- Exposure to blue light from screens can delay the circadian rhythm by up to 1.5 hours (Harvard Medical School research)
- Hitting snooze can fragment sleep cycles, reducing morning alertness by up to 20% compared to waking at a single alarm