Privacy Policy
Sky Calendar for iPhone · Last updated: 29 October 2026
Sky Calendar shows the sky events above your city and reminds you of them. This policy explains which personal data the app uses, why, and what rights you have. The app has no ads, no analytics and no tracking, and your data is never sold.
Who is responsible
The controller of your personal data is Mátyás Szabó, a private individual based in Hungary.
Contact: skycalendarapp@proton.me
What data the app uses
| Data | Why | Where it is kept |
|---|---|---|
| Your Apple ID user identifier, and the email address and first name Apple shares when you first sign in (the email may be an Apple private relay address) | To create your account so your settings follow you to your other devices. The first name is used to greet you in the app; you can change or remove it in Profile. | Our server |
| Your chosen cities | To show events and weather for those places and send reminders at the right local time. | Our server |
| Reminder settings, hidden event groups, and a log of reminders already sent | To send only the reminders you want, and each one only once. | Our server |
| Push notification token of your devices | To deliver reminders through Apple Push Notification service. | Our server |
| Plus purchase status: product, transaction identifier, expiry and refund dates | To unlock Plus features on all your devices. Payment itself is handled by Apple; we never see your payment details. | Our server |
| Your precise location (only if you allow it) | To suggest the nearest city and to point the sky finder to true north. Processed on your device only and never sent to us. | Your device only |
| Camera and motion sensors | To show the sky finder overlay. Images and sensor readings stay on your device and are not stored. | Your device only |
Legal basis
We process account, city, reminder, device and purchase data because it is needed to provide the app you asked for (Article 6(1)(b) GDPR). Location, camera, motion and notifications are used only after you allow them in iOS, and you can withdraw that permission in the iOS Settings at any time.
Service providers
- Supabase Inc. hosts our database and server functions. Data may be processed outside the European Economic Area; Supabase relies on the EU Standard Contractual Clauses for such transfers.
- Apple Inc. provides Sign in with Apple, push notifications and in-app purchases under its own privacy policy.
Weather and space-weather data are fetched by our server for city locations only; no personal data is sent to those sources.
This website
This website uses no cookies, analytics or tracking, and loads nothing from third parties. It is hosted by Netlify, Inc., which processes your IP address and browser details in short-lived server logs to deliver the pages and protect them against abuse (Article 6(1)(f) GDPR). Netlify may process this data outside the European Economic Area under the EU Standard Contractual Clauses.
How long we keep data
We keep your data while you have an account. When you delete your account in the app (Profile → Delete account), your profile, cities, reminder settings, device tokens, reminder log and purchase records are deleted at once, and your Sign in with Apple tokens are revoked. Copies in server backups are removed when those backups expire, within 7 days.
Your rights
You may ask for access to your data, its correction or deletion, a copy in a portable format, restriction of processing, or object to processing. Write to the contact address above. You can also lodge a complaint with a supervisory authority; in Hungary this is the Nemzeti Adatvédelmi és Információszabadság Hatóság (NAIH, naih.hu), or the authority in your own country.
Children
Sky Calendar is not directed at children under 13, and we do not knowingly collect their data.
Changes
If this policy changes, the new version is published on this page with a new date. Significant changes are also announced in the app.