Digital Timer & Stopwatch Online with Alarm, Study, Sports and Classroom Use!
Countdown Timer with Audio Alert
Stopwatch
Tool Features & Details
This single-layout Timer & Stopwatch tool includes audio alerts when the timer completes. Switch between modes using the toggle buttons above.
Audio Alert System
Plays a clear notification sound when the timer reaches zero. Toggle on/off with the audio switch.
Single Layout
Both timer and stopwatch in one interface with simple toggle buttons to switch between modes.
Responsive Design
Automatically adjusts to fit any screen size from desktop to mobile devices.
Error Free
Input validation and error handling prevent common timing errors and issues.
How to Use
- Toggle Modes: Use the Timer/Stopwatch buttons at the top to switch between functions.
- Audio Alert: Enable/disable audio alerts using the toggle switch. Test the sound with the "Test Sound" button.
- Timer: Set hours, minutes, and seconds, then click Start. Audio will play when timer completes.
- Stopwatch: Click Start to begin timing. Use Lap to record intermediate times without stopping.
- Visual Alerts: Timer display pulses and changes color when counting down the last 10 seconds.
- Notifications: A notification appears when timer completes (top-right corner).
Audio Alert Details
The audio alert system uses Web Audio API to generate a clear, pleasant beep sound when the timer completes. The sound is:
- Adjustable volume (controlled by your device volume)
- Can be toggled on/off without affecting other sounds
- Testable before starting the timer
- Works across all modern browsers
Technical Details
Built with pure HTML, CSS, and JavaScript. Uses Web Audio API for sound generation, requestAnimationFrame for precise timing, CSS Flexbox/Grid for responsive layouts, and localStorage to persist data between sessions.