Supported Features
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VoiceOver
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Voice Control
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Larger Text
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Dark Interface
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Differentiate Without Color Alone
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Sufficient Contrast
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Reduced Motion
Muster – Calendar Alarms
A call to alarms
Free · In‑App Purchases
Each morning, pick the events that need an alarm today. Free for 14 days, then a one-time purchase: no subscription, no account, no tracking.
Muster turns the meetings you can’t be late for into real alarms—the kind that ring through Silent mode and Focus until you act on them, not a notification that’s easy to miss.
Each morning, open Muster to see your day. A dot on the bell marks events that look like they need an alarm: video calls, places to be, meetings with other people. Tap a bell to arm one, or arm every suggestion at once.
Real alarms for your calendar
- Alarms break through Silent mode and Focus, show on the Lock Screen, and can be snoozed
- By default each rings 10 minutes before the event and snoozes for 9. Change both in Settings, or set your own on a single event
- Give a repeating meeting its own timing and Muster remembers it next time
- When events are rescheduled or canceled, their alarms change the next time you open Muster
For anything not on your calendar, tap + and type or dictate it. “Standup 9, Design review 11, Quarterly planning 4:30” sets three at once.
A daily ritual
- An optional morning reminder at the time you choose, on weekdays only if you like
- With the reminder on, Muster’s icon shows a badge until you’ve checked your day
- Switch off calendars that don’t need alarms, like holidays and birthdays
On your Home Screen and your wrist
- The Today widget lists your events with a bell beside each. Tap one to set its alarm without opening Muster
- Lock Screen widgets show whether today’s alarms are set and what’s next
- Shortcuts actions set an alarm, or every suggested alarm, from your own automations
- On Apple Watch, see your day, arm alarms from your wrist, dictate new ones, and add a complication for your next alarm
Private by design
- Read-only: Muster never adds, edits, or deletes anything on your calendar
- No account, no tracking, no cloud
- Works with the calendar accounts on your iPhone or iPad, including iCloud, Google, and Microsoft Exchange
Free for 14 days, then a one-time purchase to keep setting alarms. Not a subscription. Family Sharing supported.
The Home Screen widget has a new look at its small and medium sizes, to match the large widget, the Lock Screen and Apple Watch.
The developer, Driven Leaf, 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 Not Collected
The developer does not collect any data from this app.
The developer indicated that this app supports the following accessibility features. Learn More
Information
- Seller
- Driven Leaf, LLC
- Size
- 9.7 MB
- Category
- Productivity
- Compatibility
Requires iOS 26.1 or later.
- iPhone
Requires iOS 26.1 or later. - iPad
Requires iPadOS 26.1 or later. - Apple Watch
Requires watchOS 26.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- In-App Purchases
Yes
- Muster Unlock $9.99
- Muster Tip - Reveille $4.99
- Muster Tip - Ringer $2.99
- Muster Tip - Riser $0.99
- Copyright
- © 2026 Driven Leaf, LLC
