Alarm Clock

A simple alarm clock that runs in your browser and plays a synthesized beep.

When to use?

Use it when you want a sound and visual alert at a set time while keeping the browser open during study, work, or cooking.

Set the time to ring and a label to show when the alarm fires.

A periodic interval timer compares the current time with your alarm list every second and synthesizes a tone via the Web Audio API on a match.

Set daily alarms - Set alarms for meetings, medication, and daily routines.
Work-time reminders - Use it at specific times to take breaks or stretch during work.

The alarm will not ring if you fully close the browser tab or the computer enters sleep mode.
Depending on your browser settings, audio playback permission (unmute) may be required.

To check that the alarm sounds correctly, press the 'Test alarm sound' button at the top. The browser's sound must be on.

If the device sleeps or the browser tab is killed in the background, the alarm may be delayed or skipped, so keeping the screen on is recommended.

No. The browser window or tab must stay open for it to work.

Check that the browser is not muted and that audio playback permission is allowed.

Countdown Timer - A countdown timer that alerts you when the set time reaches zero.
Stopwatch - Measure time in milliseconds and record lap times.
Pomodoro Timer - A timer with 25-minute focus and 5-minute break cycles to boost concentration.
Sleep Time Calculator - Calculate recommended bedtimes aligned to 90-minute sleep cycles based on your wake time.
Time Calculator - Add or subtract time from a clock time, and calculate the interval between two times.
Date Difference Calculator - Calculate the number of days between two dates, or the date N days from a reference date.