About Online Alarm Clock

What is Online Alarm Clock?

Online Alarm Clock is a free web application that lets you set alarms, run countdown timers, use a stopwatch, and check the current time in any city around the world — all from your browser, with no downloads or sign-up required.

The app is designed to be simple, fast and reliable. It stores all your alarms locally in your browser, which means your data never leaves your device and the app continues to work even without an internet connection after the first load.

Features

• Multiple alarms — set as many alarms as you need, each with a custom label, sound, volume and snooze duration.
• Flexible scheduling — alarms can repeat once, daily, weekdays, weekends, or on specific custom dates.
• Custom alarm sounds — pick from built-in tones (beep, digital, chime, birds, rain) or upload your own audio file.
• Countdown timer — precise timer with an audible alert when it finishes.
• Stopwatch — lap-time stopwatch with millisecond precision.
• World clock — search any city or timezone and see the live local time.
• Offline support — works without an internet connection after the first visit.
• Dark and light mode — choose the theme that suits your environment.

Privacy First

We take your privacy seriously. All alarm data is stored exclusively in your browser's local storage — nothing is sent to any server. We do not collect personal information, require registration, or track individual users. See our Privacy Policy for full details.

Get in Touch

Have a question, suggestion or found a bug? We'd love to hear from you. Visit our Contact page to send us a message.