Set custom alarms with sounds, repeat schedules, and browser notifications. No signup required.
7:00 AM
No alarms set
Add your first alarm above
Choose from multiple alarm tones
Set daily or weekday alarms
Get alerts even when tab is inactive
Alarms saved in your browser
Use the hour and minute inputs to set your desired alarm time. The clock displays time in 12-hour format with AM/PM indicators for easy reading.
Add a descriptive label to identify your alarm, select a repeat pattern (once, daily, or weekdays), and choose from multiple alarm sounds to match your preference.
Allow browser notifications when prompted. This ensures you receive alerts even when the Castimer tab is not active. Your alarms are automatically saved in your browser.
Access your alarm clock from any device with a web browser. No app downloads or updates needed. Works on desktop, tablet, and mobile devices.
Set alarms for meetings, breaks, and end-of-day reminders. Keep your work schedule organized without relying on your phone or physical clock.
Create and manage multiple alarms for different purposes. Label each alarm to stay organized—work meetings, personal reminders, or daily routines.
All alarm data is stored locally in your browser. No account creation required, no data sent to servers. Your schedule stays private and secure.
The alarm will trigger as long as the tab remains open. For best results, keep the Castimer tab open in your browser. Browser notifications will alert you even if you are working in another tab.
You can set unlimited alarms. All alarms are stored in your browser's local storage, so there is no server-side limit. However, clearing your browser data will remove saved alarms.
Yes, the online alarm clock works on any device with a modern web browser, including smartphones and tablets. For reliable alerts, keep your device awake and the tab active.
No account or signup is required. Simply visit the page, set your alarm, and allow browser notifications. Your alarms are saved automatically in your browser.
Your alarms are automatically saved in your browser's local storage. When you refresh or revisit the page, all your saved alarms will be restored.