Cap Céleste
Privacy policy
Updated September 27, 2026.
The short version
Cap Céleste works without an account. Without one, everything stays on your device. No ads, no selling of data, no advertising cookies.
What stays on your device
Your progress, settings and observing location are saved on your phone or browser.
Your location is used to compute the sky above you. The math runs on the device: your location is never sent to our servers. You can deny access and pick a place by hand.
The evening reminder is scheduled on your device. No server sends you notifications.
If you create an account
We store your email, your nickname, your password (hashed, never readable) and the account creation date. Your progress is copied to our servers so you can find it on another device.
Accounts and data are hosted by Neon (servers in London, United Kingdom). The website and API are hosted by Vercel, which keeps temporary technical logs (IP address, request time).
Purchases
Payment goes through RevenueCat and Stripe on the web, and Google Play in the Android app. We never see your card number. We only receive the purchase status, linked to your account id.
Your feedback
On the feedback page, we receive your rating, your answers, your email if you give it, and your device type. They are stored on our side and forwarded to our mailbox (via Resend or Web3Forms).
Audience measurement
On the website, Vercel Web Analytics counts visits and a few key steps (first mission, chapter completed…). The data is anonymous and cookie-free.
Other services we call
- Open-Meteo: the text you type to search for a place.
- Celestrak: the position of the ISS. Nothing about you is sent.
- Google Fonts: the text fonts.
How long
Your account and synced progress are kept as long as the account exists. When you delete your account, your feedback is kept without your email or id. The purchase record is kept by RevenueCat, Stripe or Google for as long as accounting law requires.
Delete your account
In the app: Me tab, then “Delete my account”.
On the web: sign in on capceleste.com, Me tab, then “Delete my account”.
By email: write to maxall-dev@outlook.com from the account address. We delete it within 30 days.
Deleted: your account, email, nickname and synced progress. Your local progress stays on your device until you uninstall the app.
Your rights
You can ask to access, correct, delete or get a copy of your data. Write to maxall-dev@outlook.com. You can also contact the French data authority, the CNIL.
Cap Céleste is for all ages: without an account, the app collects no data. If you are under 15, ask a parent before creating an account.