This app is an alarm that notifies at dawn, sunrise, sunset and dusk. If you would like to begin activities 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 the 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 is 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 1.5.3

- The final version to support iOS 9–11.

Ratings and Reviews

4.6 out of 5
14 Ratings

14 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. 👍🏻🙏🏼

Bsnwrk ,

Simple easy to use

Can I change the alarm sound? Yes and thank you. This is the app I was looking for.

Developer Response ,

Please tap on a text part “Dawn/Sunrise/Sunset/Dusk”.

App Privacy

The developer, Takafumi AMANO, 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 Used to Track You

The following data may be used to track you across apps and websites owned by other companies:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Data Linked to You

The following data may be collected and linked to your identity:

  • Location
  • Identifiers
  • Usage Data
  • Diagnostics

Data Not Linked to You

The following data may be collected but it is not linked to your identity:

  • Diagnostics

Privacy practices may vary, for example, based on the features you use or your age. Learn More


  • Family Sharing

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

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