# Calendar Alarm:For night shift — Best for irregular wake up > Alarm clock for irregular schedules with custom patterns and automatic call snooze. (iPhone/iPad app by Kenta Shimomura.) - Source: https://appshunter.io/ios/app/calendar-alarmfor-night-shift/id1621807172 (this page in markdown: same URL + `.md`) - Developer: [Kenta Shimomura](https://appshunter.io/developer/1286473553) - Category: Lifestyle, Utilities - Price: Free - Rating: 3.90/5 from 8 App Store ratings - Age rating: 4+ - Requires: iOS 15.6 · 106 MB - Languages: American English, Japanese, Chinese (Simplified, China) - Released: 2022-05-07 - Data updated: 2026-06-01 - Monetization: ad-supported - User reviews in markdown: https://appshunter.io/ios/app/calendar-alarmfor-night-shift/id1621807172/reviews.md ## What is Calendar Alarm? Automatic call is available!! "Calendar Alarm" is a perfect alarm clock app for people who don't have the same wake-up time every day, such as shift work, night shifts, or working from home. Normal alarms can be set for each day of the week, but have you ever forgotten to set an alarm and overslept, or woken up at a time you shouldn't have? It's a hassle to change the settings every day, and setting alarms one by one on a calendar is tedious and difficult to use.This app was born out of these concerns, and is perfect for people who wake up at irregular times. Let the simple, easy-to-use interface combined with rich features help you improve your morning routine and make your daily life smoother! ■New feature Automatic call! ! Equipped with an automatic call as a snooze function! If you haven't started the app and stopped the alarm after the scheduled time, you will receive an automatic call! Please help prevent oversleeping! ■Features of Calendar Alarm By registering your own wake-up time pattern, you can easily set it! You can register a name and set a theme color for each pattern, and you can easily check the registered wake-up times for each day in a list! ■Function 1 Background startup The alarm still sounds even if the screen is turned off. No need to leave the app open when you go to bed! (If the app is closed or crashes, you will receive a push notification.) ■Function 2 Sound The sound will be heard even in silent mode! No need to switch your smartphone every time! (You can also turn off the sound.) ■Function 3 Vibration You can also set the vibration On/Off! ■Function 4 Batch change By editing linked patterns, you can change them all at once. For example, if you want to wake up 5 minutes earlier, you don't have to change the time you set for each day, you can apply it to all days by editing the registered pattern itself! ■How to use There are several patterns for wake-up times, such as early shift, late shift, night shift, and working from home, so you can easily create and register your own pattern! 1. Register as many wake-up time patterns as you need 2. Link registered patterns to alarms by date with one touch 3. Set alarms for multiple days at once on the monthly calendar If you want to use the automatic snooze function... 4. Create an account and turn on automatic calls! If you have irregular wake-up times, use this app to free yourself from the hassles of the past and have a more comfortable morning! ## Key features - Custom wake-up time patterns - Automatic call snooze function - Background alarm startup - Sound in silent mode - Batch editing of patterns - Link patterns to dates ## Frequently asked questions about Calendar Alarm ### Does Calendar Alarm have ads? Yes, Calendar Alarm contains advertisements. This is how the app is supported as it is offered for free. ### How does Calendar Alarm prevent oversleeping? Calendar Alarm offers an automatic call feature as a snooze function. If you don't interact with the alarm after the scheduled time, you will receive an automatic call to help prevent oversleeping. ### Can Calendar Alarm wake me up if my phone is on silent? Yes, the alarm sound will be heard even in silent mode. This means you don't need to manually switch your smartphone's sound settings every time you go to bed. ### How does Calendar Alarm handle irregular wake-up times? You can register custom wake-up time patterns for different schedules, like early shift, late shift, or night shift. These patterns can then be easily linked to specific dates on a monthly calendar. ### What is the rating for Calendar Alarm? Calendar Alarm has a rating of 3.9 stars based on 8 ratings. ### Can I edit multiple alarms at once in Calendar Alarm? Yes, Calendar Alarm features batch editing. By editing linked patterns, you can change alarm times for multiple days simultaneously, such as adjusting all alarms by 5 minutes. ### Does Calendar Alarm work when the screen is off? Yes, the alarm will sound even if the screen is turned off. You do not need to keep the app open when you go to bed. ### What devices is Calendar Alarm available on? Calendar Alarm is available on iPhone and iPod. ## Version history (last 5 releases) ### 5.0.0 — 2025-10-22 Fixed a bug that prevented four or more alarm patterns from being registered. ### 4.0.1 — 2025-03-06 Fixed some minor bugs. ### 4.0.0 — 2025-02-06 Added new feature for Japanese language ### 3.6.2 — 2024-07-09 Fixed minor issues. ### 3.6.1 — 2024-06-24 Fixed a minor issue. ## Apps similar to Calendar Alarm | App | Rating | Price | Category | | --- | --- | --- | --- | | [Alarmy - Loud alarm clock](https://appshunter.io/ios/app/alarmy-loud-alarm-clock/id1163786766) | 4.8 (237,217) | Free | Lifestyle | | [Lofi Alarm Clock - Wake Up](https://appshunter.io/ios/app/lofi-alarm-clock-wake-up/id6471688584) | 4.7 (12) | Free | Lifestyle | | [World Clock.](https://appshunter.io/ios/app/world-clock/id1636448532) | 4.3 (635) | Free | Lifestyle | | [AlarmMon ( alarm clock )](https://appshunter.io/ios/app/alarmmon-alarm-clock/id529141346) | 4.7 (1,106) | Free | Lifestyle | | [Alarm Clock-Keep Alarm](https://appshunter.io/ios/app/alarm-clock-keep-alarm/id6449082210) | 4.6 (19) | Free | Lifestyle | | [Alarm ®](https://appshunter.io/ios/app/alarm/id6471868880) | 4.4 (68) | Free | Lifestyle | ## More apps by Kenta Shimomura - [英単語9000-効率的に単語を暗記](https://appshunter.io/ios/app/9000/id1311568845) - [Slow repeat camera](https://appshunter.io/ios/app/slow-repeat-camera/id1547114762) All apps by Kenta Shimomura: https://appshunter.io/developer/1286473553 ## Related topics [shift calendar alarm](https://appshunter.io/ios/topics/shift-calendar-alarm) --- *Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-01.*