Alarm Clock

What this tool does

This alarm clock lets you set one or more alarms by time of day and rings them right in your browser. Each alarm has a time, an optional label so you remember what it is for, and an on/off switch. A large live clock shows the current time and date, updating every second. When an alarm’s time arrives, the page plays an attention-grabbing tone and shows a dismiss prompt so you can clear it.

Everything happens locally. There is no account, no server, and no app to install — you open the page, set your alarms, and leave the tab running.

Use cases

A browser alarm is handy whenever you are already working at a computer. Use it as a wake-up alarm if you sleep near your desk, or to remember a meeting, a call, or the end of a focus block. It works well for cooking and laundry cues, for reminding yourself to take a break or stretch, and for time-boxing tasks during the day. Because each alarm carries a label, you can line up several — “stand-up”, “lunch”, “leave for the gym” — and see at a glance what each one is for. The 24-hour display option suits anyone who prefers it or works across schedules where AM/PM is ambiguous.

How to use it

1. Pick a time using the time field. You can type it or use the field’s own picker; it accepts both 12-hour and 24-hour input depending on your system.
2. Optionally add a label so the alarm is self-explanatory.
3. Click Add alarm. The alarm appears in the list below, sorted by time.
4. Toggle any alarm on or off with its switch — a disabled alarm stays in the list but will not ring.
5. When an alarm fires, a prompt appears at the top of the page. Click Dismiss to stop the sound and clear the prompt.
6. Use Mute alarm sound if you want the visual prompt without audio, and 24-hour display to switch the clock format.

Tip: after loading the page, click anywhere once. Browsers only allow sound after a user interaction, so this single click “arms” the audio for later.

Privacy & your data

Your alarms are stored in this browser only, in its local storage. They are not sent to any server, there is no cloud sync, and they cannot be accessed from another device or another browser. This keeps things private — nobody sees what you set — but it also means the data is fragile: clearing your browsing data, using private/incognito mode, or switching browsers will lose your alarms. If a set of alarms matters to you, treat them as convenient but not permanent, and re-create them if your browser storage is cleared.

The alarm sound is generated by your browser’s audio engine on the fly, so no sound file is downloaded and nothing about your usage is tracked.

Tips

Keep the tab open. A background tab is fine — you can switch to other tabs or apps — but the page must stay loaded for the alarm to fire. If your computer goes to sleep, the alarm will not ring until the machine wakes again, so for critical wake-ups a dedicated device alarm is safer as a backup.

Because the clock is timestamp-based, it stays accurate even if the tab was in the background: when you return, the displayed time corrects itself immediately and any alarm whose minute passed while you were away will ring as soon as the page checks. Give each alarm a clear label so a glance at the list tells you everything, and disable rather than delete alarms you use on and off through the week — that way they are one toggle away when you need them again.