This app is an alarm which notifies at dawn, sunrise, sunset and dusk. If you would like to begin activity soon after sunrise, the app is most suitable. The app can confirm sunrise, sunset, dawn and dusk on a current position and main cities immediately. And you can check time of the dawn, the dusk, the sunrise and the sunset even if you do not allow local notifications.

The app is using Japanese dawn and dusk which established by a samurai (a shogunate employee), but there are almost the same civil twilight. The civil twilight begins and ends when the geometric center of the sun is 6° below the horizon. However, the dawn begins and the dusk ends when the geometric center of the sun is 7.3611° below the horizon. If turn on the civil twilight switch, the dawn and the dusk will be civil dawn and civil dusk.

■ Exemption from Liability

ASTI will not be held liable for anything that transpires as a result of using this information. No liability whatever will be accepted for any damage, injury or loss that may be suffered as a result of using the app.

What’s New

Version 1.4.5

- Fixed a bug.

Ratings and Reviews

4.6 out of 5
7 Ratings

7 Ratings

RM0315 ,

Grateful for this app

This app is very helpful. I don't know any other app that works this well. Thank you for making improvements. If I was able to choose the days that I want the the alarm to go off then that would be perfect.

Inimkuraj ,

Respect to the author

I use it for yoga meditation in brahma muhurta time. Thanks a lot for this app.
It is very easy to settle local time and choose a pleasant sound for alarm.
For a month it never failed to ring me up. 👍🏻🙏🏼

Dogoftheopera ,

Works great

Does just what it promises. Easy to use, works perfectly.


Takafumi AMANO
18.7 MB

Requires iOS 9.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Japanese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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