Online alarm clock - Set and manage alarms directly in your browser
Cronometro’s online alarm clock sets reminders in your browser — no download or account. Meetings, study, workouts, or daily routines stay on schedule on any device. Pair it with the online flip clock for everyday timekeeping.
Repeat & snooze
Repeat on specific weekdays so work or gym reminders don’t need recreating. When it rings, Snooze with a custom delay that fits your routine.
Saved in this browser
Alarms autosave in local storage — refresh or reopen and your list stays intact. Enable, disable, or delete anytime. Nothing is uploaded.
How to set an alarm
1Pick a time
Select your desired time or a preset slot.
2Choose a sound
Choose an alarm sound and preview it.
3Add a title
Add a title for quick identification.
An online alarm clock is a web-based tool that allows you to set alarms for specific times directly in your browser without installing any apps or software.
Yes. Cronometro lets you create and manage multiple alarms with custom titles, sounds, and schedules, all stored locally in your browser.
Yes. All alarms are saved in your browser storage, so they remain available even after refreshing the page or reopening your browser.
Absolutely. You can select from multiple alarm sounds, preview them before saving, and control how long the alert plays.
Yes. The tool includes both light and dark modes, along with a sleep-friendly screen option, to ensure comfortable use at any time of day.
Yes. Choose which days of the week an alarm should repeat on — perfect for recurring reminders like weekday wake-ups or gym sessions, without recreating the alarm every time.
Yes. When an alarm rings, tap Snooze to delay it by a set number of minutes (9 by default) — you can change that duration in Settings to fit how much extra time you actually want.
Yes. Turn on Fade-in volume in Settings and the alarm sound starts quiet and ramps up to full volume over about 12 seconds, instead of blasting immediately — a gentler way to wake up.
Yes. The quick-time buttons (e.g. 6:00 AM, 7:30 AM) fill in the time picker with one tap — already-scheduled times are visually marked so you can see at a glance which slots are taken.
A one-time alarm (no repeat days selected) automatically turns itself off after it fires, so it won't ring again the next day by mistake. A repeating alarm stays on and moves to its next scheduled day.