Alarm
Online Alarm Clock
Set an online alarm with sound, choose your time format, and keep it running in the same clear, premium layout used across ClockUnit tools.
Live alarm display
No alarms currently set
Quick Alarm Presets
Everything you need in a alarm
Set Alarm for Any Time
Pick any hour and minute — morning, afternoon, or night. The alarm fires exactly when the clock reaches your target.
Custom Alarm Sounds
Choose from multiple built-in tones. Preview each one and pick the sound that's most likely to get your attention.
5-Minute Snooze
Not ready yet? Hit Snooze and the alarm reschedules automatically for 5 minutes later.
Persists Across Reloads
Your alarm is saved to your browser's localStorage. Close the tab, come back — it's still set and counting down.
Works Offline
Once loaded, the alarm runs entirely in your browser. No internet connection required after the initial page load.
Mobile-Optimised
Large tap targets and a responsive layout that feels just as comfortable on a phone as on a widescreen monitor.
How to use the alarm
Open the page
Navigate to clockunit.com/alarm — no login, no download. The live clock is ready the moment the page loads.
Choose a time
Pick from popular presets (7 AM, 8 AM, 30-min nap) or type a custom hour and minute.
Activate the alarm
Click Set Alarm and the countdown begins. You'll see exactly how long until it rings.
Get alerted
When the clock hits your target time, a loud alarm sound plays and a notification modal appears instantly.
Snooze or dismiss
Tap Snooze for 5 more minutes, or Dismiss to stop the alarm completely.
Who uses this alarm?
Wake-Up Alarm
Set a morning alarm without installing an app.
Medication Reminders
Never miss a scheduled dose.
Meeting Alerts
Get alerted 5 minutes before calls start.
Power Nap Timer
Set 20–30 min for the perfect recovery nap.
Cooking Alerts
Know when to take food out of the oven.
Study Breaks
Schedule timed breaks to maintain long-session focus.
Why use ClockUnit instead of an app?
A dedicated alarm app needs installation, storage space, and often requests unnecessary phone permissions. ClockUnit runs right in your existing browser — no install, no tracking, nothing leaves your device. Works on Windows, macOS, Linux, Android, and iOS.
Unlike a phone alarm that can be silenced by system settings, ClockUnit plays its alarm directly through the browser and saves your configuration to localStorage — so even an accidental reload won't lose your alarm.