Astrelia privacy

Three permissions. All optional, all used only on your device while the app is open.

Location

Your latitude, longitude and altitude decide which sky is above you and where each object sits in it. It is used in the moment to do the maths. It is never written to a server or attached to anything.

Motion

The compass and accelerometers tell the app where the phone is pointed, so the right patch of sky is on screen. That reading never leaves the device either.

Camera

Only for AR mode, where the sky is drawn over the live view. Frames are shown on screen and thrown away. Nothing is recorded, saved to your photos, or transmitted.

Decline any of them and Astrelia still works. Set a home location in Settings and the sky is computed for that place instead.

Your settings live in the app's own preferences on your phone: the mode and field of view you left the sky in, which filters are on, your units, and a home observing location if you saved one.

That is all of it, and it stays on the device.

The star, planet, deep-sky and exoplanet catalogues ship inside the app. That is why it works with no signal at the top of a hill.

Deleting your data

Deleting the app removes its preferences with it.

Nothing of yours exists anywhere else, so there is nothing else to delete and nothing for me to hand back.

• No account, because there is no sign-in.
• No analytics, usage tracking or advertising identifiers.
• No automatic crash reports.
• No contacts, photos or microphone access.
• No location history. Your position is used and forgotten, never logged.
• No third-party SDKs of any kind.