Arrebol – Privacy Policy
Last updated: 14 October 2026
Arrebol (formerly Hallo Sunset) is made by Jiawen Sun. We don't have accounts, analytics, ads or tracking, and we don't run servers of our own. The only data we receive is feedback you choose to send.
What the app uses and why
Location. With your permission, the app uses your approximate location (about 1 km) to time golden hour, blue hour, sunrise, sunset and sky events where you are. In the camera view of the sun and moon path, it may ask for your precise location for that session, so the paths line up with the real sky; you can decline and keep approximate location. Calculations run on your device. Your last known place and the spots you save are stored on your device only, in a container shared with the app's widgets.
Apple services. To show a weather forecast and place names, the app sends coordinates to Apple (WeatherKit and Apple Maps). Apple handles this under its own privacy policy. We never receive these requests.
NOAA space weather. For the aurora outlook, the app downloads public data files from the U.S. National Oceanic and Atmospheric Administration. No personal data or location is sent.
Notifications and calendar. Alerts are scheduled on your device. Adding a light window to your calendar uses Apple's standard editor; the app cannot read your calendar.
Camera and motion. The camera and the phone's motion sensors are used only to draw the sun and moon path and the constellations over the sky, live on screen. Nothing is recorded or stored.
Feedback and support. If you send feedback from Settings, we receive your message, your email address if you add one, and diagnostic details that help us understand the issue: app version, device model, system version and language. The form stores this in Apple's iCloud (CloudKit public database), where only the developer can read it. If the form can't send, or you choose to contact us by email, the same details go to us by email. We use them only to reply to you and to improve the app.
Sharing and retention
We never sell personal data, use it for tracking or advertising, or share it with third parties. Apart from feedback you send, we do not collect personal data. Removing the app deletes everything it stored on your device. We keep feedback only as long as needed to handle it; email us to have yours deleted.
Children
The app is suitable for all ages and collects no data from anyone unless they choose to send feedback.
Contact
Questions: https://sunapp24.com/