Press Kit | MustDo: To-Do Alarm

One line · 50 words · 100 words

One line

MustDo is an iPhone app that turns a to-do into a real alarm that rings until you stop it.

50 words

MustDo: To-Do Alarm turns each to-do into a real iPhone alarm built on AlarmKit in iOS 26. It rings at the set time, through Silent mode and Focus, until you stop it. Stopping means done; snooze 10 minutes, 1 hour or until tomorrow if not. Data stays in the user's own iCloud, no sign-in.

100 words

"I'll do it later." Later rarely comes. The notification arrives, disappears, and the phone stays face down on the desk. MustDo: To-Do Alarm is an iPhone app for the things that cannot slide. Add a to-do and a time, and at that time a real alarm, the same kind the Clock app uses (AlarmKit in iOS 26), rings and keeps ringing until it is stopped, even on Silent mode or in Focus. Stop means done; otherwise snooze 10 minutes, 1 hour or until tomorrow, and it rings again. A one-line to-do defaults to tomorrow at 9:00, and repeats are as flexible as the iOS Calendar. To-dos live only in the user's iCloud; there is no developer server. AI assistants such as Claude can add to-dos through MCP. Free for 30 days, then a subscription. Made by Lightning LLC.

Fact sheet

Name	MustDo: To-Do Alarm (Japanese: やるまで鳴るアラーム / MustDo)
Tagline	Rings until it's done.
Category	To-do alarm for iPhone (real alarms via AlarmKit)
Requires	iOS 26 or later
Languages	8 (English, Japanese, German, French, Spanish, Korean, Simplified Chinese, Traditional Chinese)
Pricing model	Free for 30 days, then a subscription (monthly or yearly). To-dos already added keep ringing without a subscription
Release	October 2026 (App Store)
Where data lives	The user's own iCloud (CloudKit private database). Nothing is stored on a developer server. No account, no sign-in
AI integration	MCP (a server for Mac, or a custom connector in claude.ai) reads and adds to-dos
Key features	Rings until stopped · snooze until done (10 min / 1 hour / tomorrow) · one line = tomorrow at 9:00 · repeats like the iOS Calendar · Live Activity on the Lock Screen · 25 alarm sounds · optional Face ID lock
Developer	Lightning LLC (Japan)
App Store	https://apps.apple.com/app/id6819156067
Web	https://ltng.jp/mustdo
Contact	https://ltng.jp/#contact