What is Alarm Clock?
Alarm Clock is a web-based alarm application that helps you set reminders and wake-up calls directly in your browser. Whether you need to wake up in the morning, take medication on time, or get reminded about meetings, this tool has you covered.
Unlike phone alarms that can get silenced by Do Not Disturb mode, this browser-based alarm works independently and can even send browser notifications when the tab is in the background.
Key Highlights
Multiple Alarms
Set as many alarms as you need, each with its own custom settings and schedule.
Real-Time Countdown
See exactly how long until each alarm rings with live countdown display.
Custom Sounds
Choose from 4 different alarm tones or upload your own audio files.
Flexible Scheduling
One-time, daily, or custom day repeats to fit your routine.
Snooze Support
Get 5 more minutes when you need it with built-in snooze function.
Auto-Stop
Alarm automatically stops after your set duration to prevent endless ringing.
Works Entirely in Your Browser
All your alarms are saved locally on your device. No account needed, no data uploaded to servers. Your alarms persist even after closing the browser, as long as you don't clear your browser data.
Important: Keep This Tab Open
For alarms to work properly, please keep the following in mind:
- Keep your browser open - The alarm needs your browser running to ring on time
- Keep this tab open - You can switch to other tabs, but don't close this one
- Don't let your device sleep - Alarms won't ring if your computer goes to sleep
- Turn on browser notifications - This helps you hear the alarm even when working in other tabs
Think of it like having an alarm clock on your desk - it needs to stay plugged in to wake you up!
- 1. What is Alarm Clock?
- 2. How to Use Alarm Clock
- 3. Features
- 4. Frequently Asked Questions
- 4.1. Will the alarm work if I close the browser tab?
- 4.2. Why didn't my alarm go off?
- 4.3. How do I stop a ringing alarm?
- 4.4. What happens to one-time alarms after they ring?
- 4.5. Can I set alarms for specific days of the week?
- 4.6. What does "Ring duration" mean?
- 4.7. Are my alarms saved if I close the browser?
- 4.8. How do I enable browser notifications?
- 4.9. Can I upload my own alarm sounds?
- 4.10. Can I use this alarm clock on my phone?
How to Use Alarm Clock
Setting Your First Alarm
Create New Alarm
Click the Add Alarm button or press N on your keyboard to open the alarm creation dialog.
Set Time
Set the time using the hour and minute inputs, or use Quick Add buttons (+5m, +10m, +15m, +30m, +1h) for faster setup.
Add Label (Optional)
Optionally add a label to identify this alarm (e.g., "Wake up", "Meeting", "Take medicine").
Choose Repeat Schedule
Select your preferred repeat schedule: Once, Daily, or Custom days for specific weekdays.
Select Sound
Choose your preferred alarm sound and test it, or select "Upload new sound..." to use your own audio file (MP3, WAV, or OGG, max 5MB).
Set Ring Duration
Set the ring duration (how long the alarm will sound before auto-stopping, from 1 to 60 minutes).
Save Alarm
Click Save to create the alarm and add it to your alarm list.
Managing Alarms
Each alarm card shows the time, label, repeat schedule, and a real-time countdown. You can:
Toggle On/Off
Edit Settings
Delete Alarm
When the Alarm Rings
When your alarm time arrives, a fullscreen notification appears with the alarm sound playing. You have two options:
5 More Minutes
- Stops the alarm temporarily
- Reschedules it for 5 minutes later
- Can be used multiple times
- Perfect for gradual wake-up
Stop Completely
- Stops the alarm permanently
- One-time alarms will be disabled
- Recurring alarms wait for next schedule
- Use when you're ready to start your day
Keyboard Shortcuts
| Shortcut | Action | Description |
|---|---|---|
| N | Add New Alarm | Opens the alarm creation dialog |
| Space | Dismiss Alarm | Stops the currently ringing alarm |
| Escape | Close/Dismiss | Close modal or dismiss ringing alarm |
Important Notes
- Keep the browser tab open for alarms to work
- Enable browser notifications for background alerts
- Make sure your device volume is not muted
Features
Multiple Alarms
Create and manage multiple alarms simultaneously. Each alarm operates independently with its own time, sound, and repeat settings. Perfect for managing a busy schedule with different wake-up times, medication reminders, or meeting alerts.
Real-Time Countdown
Every alarm card displays a live countdown showing exactly how long until it rings. The countdown updates every second, displaying time in hours, minutes, and seconds format. For alarms more than 24 hours away, it shows the day and time.
Live Updates
Long-Range Display
Flexible Repeat Options
Once
Alarm fires one time and automatically disables itself after ringing.
- Perfect for one-time events
- Auto-disables after ringing
- Ideal for appointments
Daily
Alarm repeats every day at the same time without manual reset.
- Consistent daily routine
- Automatic repetition
- Great for wake-up calls
Custom
Select specific days of the week for targeted reminders.
- Choose any weekday combination
- Perfect for workout schedules
- Flexible weekly patterns
Alarm Sounds
Choose from built-in tones or upload your own:
Pre-loaded Alarm Tones
Choose from 4 professionally designed alarm sounds:
- Classic Bell - Traditional alarm clock sound
- Digital Beep - Modern electronic tone
- Gentle Chime - Soft, pleasant wake-up sound
- Radar - Distinctive beeping pattern
Upload Your Own Audio
Personalize your alarms with custom audio files:
- Supported formats: MP3, WAV, and OGG
- Maximum file size: 5MB per file
- Storage limit: Up to 2 custom sounds
- Auto-management: Oldest sound removed when uploading a third
Snooze Function
Not ready to get up? Hit snooze to silence the alarm for 5 minutes. The alarm will ring again when the snooze period ends. You can snooze multiple times if needed.
5-Minute Intervals
Unlimited Snoozes
Auto-Stop Duration
Set how long the alarm should ring before automatically stopping (1-60 minutes). This prevents the alarm from playing indefinitely if you're away from your device or unable to dismiss it manually.
Browser Notifications
Enable browser notifications to receive alerts even when the alarm clock tab is in the background. You'll see a notification pop-up when it's time, helping ensure you don't miss important alarms while browsing other sites.
Enable in Settings
Toggle on "Browser notification"
Grant Permission
Allow notifications when prompted
Get Alerts
Receive pop-ups even in background
Local Storage
All your alarms and settings are saved in your browser's local storage. Your data stays on your device, persists across browser sessions, and requires no account or internet connection to maintain.
Complete Privacy
Your data never leaves your device or gets uploaded to any server.
Offline Functionality
No internet connection required to maintain or use your alarms.
Persistent Storage
Alarms persist across browser sessions until you clear browser data.
Frequently Asked Questions
Will the alarm work if I close the browser tab?
No, the alarm requires the browser tab to remain open. However, the tab can be in the background while you work in other tabs or applications. Enable browser notifications to receive alerts even when the tab is not active.
Why didn't my alarm go off?
Common reasons include:
- The browser tab was closed
- Your device went to sleep or was shut down
- The alarm was toggled off
- Browser permissions blocked the audio playback
- Device volume was muted
How do I stop a ringing alarm?
You have multiple options to stop a ringing alarm:
- Click the Dismiss button on the alarm notification
- Press Space on your keyboard
- Press Escape on your keyboard
- Click anywhere on the backdrop behind the notification
- Click Snooze to silence it for 5 minutes
What happens to one-time alarms after they ring?
One-time alarms automatically disable themselves after ringing and being dismissed. The alarm remains in your list but won't ring again unless you edit it and re-enable it.
Can I set alarms for specific days of the week?
Yes, use the Custom repeat option to select specific days. For example, select Mon, Wed, and Fri for a workout alarm that only rings on those days.
Example use cases:
- Workout reminders: Mon, Wed, Fri
- Weekday wake-up: Mon-Fri only
- Weekend activities: Sat, Sun
- Medication schedule: Tue, Thu, Sat
What does "Ring duration" mean?
Ring duration is how long the alarm will sound before automatically stopping if you don't manually dismiss or snooze it. The default is 5 minutes, but you can set it anywhere from 1 to 60 minutes.
| Duration | Best For |
|---|---|
| 1-2 minutes | Quick reminders, brief notifications |
| 5 minutes | Standard alarms, default setting |
| 10-15 minutes | Important wake-up calls, meetings |
| 30-60 minutes | Critical alarms, when you might be away |
Are my alarms saved if I close the browser?
Yes, all alarms and settings are saved in your browser's local storage. When you return to the page, your alarms will be restored. However, clearing browser data will delete them.
Alarms Preserved
- Closing the browser
- Restarting your computer
- Switching browsers (per browser)
- Clearing history only
Alarms Deleted
- Clearing browser cache/data
- Clearing site data
- Using incognito/private mode
- Uninstalling browser
How do I enable browser notifications?
Toggle on Browser notification in the Settings panel. Your browser will ask for permission to show notifications. Make sure to allow it for the alarm to send background alerts.
Open Settings
Click the settings icon or menu to access the Settings panel.
Toggle Notifications
Find "Browser notification" option and toggle it on.
Grant Permission
When your browser prompts for permission, click "Allow" or "Yes".
Can I upload my own alarm sounds?
Yes! Click the sound dropdown when creating or editing an alarm and select "Upload new sound..." to add your own audio file. Supported formats are MP3, WAV, and OGG (max 5MB). Custom sounds are stored in your browser and limited to 2 files to save memory. When you upload a third sound, the oldest one is automatically removed.
Supported Formats
- MP3 - Most common format
- WAV - High quality audio
- OGG - Open source format
Storage Limits
- Max file size: 5MB
- Max files: 2 custom sounds
- Auto-cleanup: Oldest removed when adding 3rd
Can I use this alarm clock on my phone?
Yes, the alarm clock works on mobile browsers. However, keep in mind that mobile browsers may suspend background tabs more aggressively, which could affect alarm reliability. For best results, keep the tab active.
Tips for mobile usage:
- Keep the browser app in the foreground
- Prevent your device from auto-locking
- Enable browser notifications for better reliability
- Test alarms before relying on them for important events
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