AirAlarmSide-by-side comparison
| Feature | Wake window | Fixed alarm |
|---|---|---|
| Input | Earliest and latest time | One exact time |
| Alarm movement | Allowed inside the range | None |
| Schedule fit | Flexible mornings | Hard departures and coordination |
| Planning question | “What range is safe?” | “What minute must I be awake?” |
| Common mistake | Making the range wider than life permits | Setting the deadline with no buffer |
Example: a commute with some room
You need to leave by 7:40, and your morning routine takes about 40 minutes. Waking between 6:40 and 7:00 is workable. A 20-minute wake window can use that flexibility while keeping 7:00 as a firm latest time.
Do not set 6:20 as the earliest time merely to give the app more options if you would immediately dismiss an alarm that early. A window is only useful when you accept its full range.
Example: an exact handoff
You need to relieve another caregiver at 6:30 or join a live call at a fixed time. Here, one exact alarm plus preparation buffer is easier to reason about. A flexible window adds little value and may cost sleep by waking you earlier.
How AirAlarm uses the window
After estimating the sleep start from a sustained AirPods audio change, AirAlarm checks 90-minute intervals inside the range and chooses the latest valid candidate. If no candidate fits, the latest boundary remains the alarm time. The app does not extend the window or schedule later than your deadline.
Three rules for a useful window
- Protect the latest time. Include enough preparation buffer before any hard obligation.
- Accept the earliest time. Do not choose a time you know you will ignore.
- Test before a critical morning. Confirm the alarm permission, volume, and final scheduled time during a low-stakes night.