MustDo: To-Do Alarm
Alarm that rings until done
Free · In‑App Purchases · Designed for iPad. Not verified for macOS.
"I'll do it later."
Later never came. The notification came and went while your phone was face down on the table.
MustDo is for the things you cannot let slide. Add a to-do and a time. At that time, a real alarm rings and keeps ringing until you stop it. Stopping it means you did it. Not yet? Snooze until you do.
■ A real alarm, not a notification
MustDo uses AlarmKit, the same system behind the Clock app's alarms. It rings full screen. It rings through Silent mode and Focus. It keeps ringing until you reach over and stop it. A notification you can swipe away is not a reminder.
■ Stop it when it's done
Stopping the alarm marks the to-do as done, and it moves to Completed in the Today tab. Tapped Done by mistake? Swipe left to undo.
■ Not yet? Snooze until you do it
"10 min", "1 hour" and "Tomorrow" are right on the alarm screen and in the Live Activity on the Lock Screen. It comes back and rings again, as many times as it takes. Tomorrow rings at the same time, or at a fixed morning time if you set one.
■ Repeats
Daily, or weekly on the days you pick. The medicine at 9 PM, the bins on Tuesday, the report every Friday. Snoozing a repeating to-do to Tomorrow skips today's occurrence only.
■ Your to-dos stay in your iCloud
Everything is stored in your own iCloud (CloudKit private database) and synced across your devices by Apple. MustDo has no server that stores your to-dos. No account, no sign-in.
■ Add to-dos from AI (MCP)
A small MCP server for your Mac lets Claude and other AI clients read and add your to-dos, straight into your iCloud. Tell your assistant what needs doing; MustDo rings until it's done.
■ Make it yours
25 alarm sounds, or vibrate only. Light, dark, or match your device. Optional Face ID lock: alarms still ring and can be stopped while the app is locked.
■ Free for 30 days, then a subscription
Try everything for 30 days. After that, a subscription (monthly or yearly, auto-renewing) is needed to add new to-dos. To-dos you have already added keep ringing without one, and you can still stop, snooze and delete them. An app like this should never go quiet because of billing.
Requires iOS 26 or later.
Website and user guide: https://ltng.jp/mustdo
Privacy Policy: https://ltng.jp/mustdo/privacy
Terms of Use: https://ltng.jp/mustdo/terms
Ratings & Reviews
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Added History at the top left. See the to-dos you completed in the last 30 days, and swipe left to undo any from the last 7 days.
After you stop an alarm, a “Marked as done” notification appears. If you stopped it by mistake, you can undo it from the notification.
The developer, Lightning LLC., indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Lightning LLC
- Size
- 15.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.0 or later.
- iPhone
Requires iOS 26.0 or later. - iPad
Requires iPadOS 26.0 or later. - Mac
Requires macOS 26.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.0 or later.
- iPhone
- Languages
English and 7 more
- English, French, German, Japanese, Korean, Simplified Chinese, Spanish, Traditional Chinese
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Yearly $7.90
- Monthly $0.99
- Copyright
- © 2026 Lightning LLC