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About the Online Alarm
Set one or more alarms in your browser. When the alarm time arrives, you'll hear an audio alert and see a browser notification (if permitted). Keep the tab open for alarms to work.
How to Use the Online Alarm Clock
- Choose a time -- Use the Alarm Time input to select the hour and minute you want the alarm to trigger. The time picker uses your device's local time format.
- Add a label (optional) -- Type a short description in the Label field, such as "Meeting" or "Take break." This label appears in the alarm list and in the desktop notification.
- Set the alarm -- Click the Set Alarm button. The alarm is added to your active list with a countdown showing how long remains until it fires.
- Manage multiple alarms -- Repeat the steps above to add as many alarms as you need. Each alarm operates independently and can be removed individually by clicking the delete button next to it.
- Wait for the alert -- When the alarm time arrives, you will hear an audio tone and see a visual highlight on the alarm entry. If browser notifications are enabled, a desktop notification will also appear.
- Dismiss -- Click the delete button on a ringing alarm to dismiss it and stop the visual alert.
How It Works
The alarm clock works by checking the current time once every second and comparing it against all active alarm times. When the current hour and minute match an alarm's set time, the alarm triggers immediately. This approach is simple and reliable, ensuring that alarms fire at the correct moment regardless of how many you have set.
The audio alert is generated using the Web Audio API, which synthesises a series of alternating sine-wave tones at 880 Hz and 1100 Hz. This produces a distinctive, attention-grabbing sound that plays directly in the browser without requiring external audio files. If you have granted notification permission, the tool also dispatches a browser notification so you can see the alert even if you are working in another application or tab.
Frequently Asked Questions
Will the alarm work if my screen locks or the device sleeps?
The alarm requires the browser tab to remain open and active. If your device enters sleep mode or the screen locks, the browser may pause JavaScript execution and the alarm could be delayed until the device wakes up. For best results, keep your device awake and the browser tab open while waiting for an alarm.
How do I enable browser notifications for alarms?
When you first visit the page, your browser will ask for notification permission. Click Allow to receive desktop notifications when an alarm goes off. If you previously denied permission, you can change this in your browser's site settings for daytics.com by navigating to the notification preferences.
Can I set multiple alarms at the same time?
Yes. You can set as many alarms as you need. Each alarm operates independently with its own time and optional label. All active alarms are listed on screen with a countdown showing how long until each one triggers, making it easy to manage your schedule at a glance.
Does the alarm work in a background tab?
Yes. The alarm checks the current time every second and will fire even if the tab is in the background, as long as the browser is still running. A browser notification will appear on your desktop if you have granted notification permission, so you will not miss it even when focused on other work.
Can I add labels to my alarms?
Yes. Each alarm has an optional label field where you can type a short description such as "Take medication," "Team meeting," or "Check oven." The label appears in both the alarm list on screen and in the browser notification when the alarm fires, helping you immediately know what the alert is for.
What sound does the alarm make?
The alarm uses the Web Audio API to generate a series of alternating tones at 880 Hz and 1100 Hz. This produces a clear, attention-grabbing alert that plays directly in your browser without needing any external sound files or plugins. The volume follows your system and browser volume settings.
