Choose OnTimer if
People who already use Apple Calendar but need a stronger action signal, custom event sounds, Early Warning, or travel-aware alarms.
Calendar alarm comparison
OnTimer vs Apple Calendar Alerts
Apple Calendar is the place to create, edit, and organize events. OnTimer uses those events as the source of truth and adds an alarm layer that stays active until you dismiss it. They work together rather than replacing one another.
Last reviewed October 13, 2026
Choose Apple Calendar if
People who are satisfied with standard event alerts and primarily need to create, view, invite, and manage calendar events.
Key differences
| What to compare | OnTimer | Apple Calendar |
|---|---|---|
| Core job | Turn calendar events into alarms | Create, organize, and view calendar events |
| Alert behavior | Stays active until dismissed | Uses iPhone calendar alerts and notification settings |
| Per-event sound | Choose a distinct alarm sound for an event | Uses Calendar alert settings |
| Travel timing | Time To Leave and Time To Fly | Calendar event features vary by account and iOS settings |
| Relationship | Adds an alarm layer | Remains the calendar source of truth |
Keep your calendar. Add an alarm layer.
OnTimer is free for one calendar provider on iPhone.