Will the alarm work if I close the browser?

No — the alarm runs in your browser tab, so the tab must stay open. Enable the Wake Lock feature to keep your screen on, and allow browser notifications as a backup alert.

How many alarms can I set?

Up to 10 alarms at once. Each alarm has its own sound, label, repeat schedule, and snooze settings.

What is the math puzzle feature?

It requires you to solve a math problem before dismissing the alarm, preventing you from turning it off while half-asleep. Three levels: Easy (addition), Medium (multiplication), Hard (square roots and multi-step).

Does this alarm work on phones?

Yes, on both iOS and Android. Keep the browser open and use the Wake Lock toggle. On iOS, the browser must stay in the foreground for audio to play.

What is the Pomodoro timer?

A productivity method: 25 minutes of focused work, then a 5-minute break. After 4 work sessions, take a longer 15-minute break. All durations are customizable.

Are the alarm sounds downloaded?

No — all 12 sounds are generated in real-time using Web Audio API. Nothing is downloaded, keeping the page fast and lightweight.

How does the sleep timer work?

It plays calming background sounds (white noise, rain, or ocean) for a set duration, then gradually fades out. Great for falling asleep before a morning alarm.

All alarms, settings, and world clock cities are saved in your browser's local storage. Nothing is sent to any server

Online Alarm Clock Free — Timer, Stopwatch & World Clock

A free online alarm clock with 12 built-in sounds, snooze function, and math puzzle wake-up challenges. Set multiple alarms with custom labels — works directly in your browser tab.

Set alarms, timers, and track time across the world

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This tool provides an interactive audio experience with real-time controls and instant feedback. Adjust settings and hear the result immediately.

For the interactive version with real-time preview, enable JavaScript in your browser.

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h : m : s

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Work

25:00

Work min

Break min

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Sessions before long break

00:00

Features

12 built-in alarm sounds generated in real-time — no downloads needed Multiple alarms with labels, repeat days, and per-alarm sound selection Math puzzle to dismiss — three difficulty levels to make sure you wake up Gradual volume increase from silence to full over 1–10 minutes

Who is this tool for?

💡 Want us to improve this tool just for you?

We can — and it's free! Just send us a quick message with your idea. If you'd like to discuss it in detail, leave your email and we'll get back to you. You can stay anonymous.

Online Alarm Clock Free — Timer, Stopwatch & World Clock

Set alarms, timers, and track time across the world

Features

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Comments

Online Alarm Clock Free — Timer, Stopwatch & World Clock

Set alarms, timers, and track time across the world

Features

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