Framing screenshots without leaving the share sheet

The whole point of Framewich is that framing a screenshot should take seconds. That means it has to work from the iOS share sheet, where there is very little memory to play with and no room for a slow start or a loading spinner.

It is also free, so anything that adds friction before the first result, a sign-up screen or a wait for the network, would lose people before they ever saw what the app does.

The share extension is kept completely free of Firebase. It reads and writes files in a shared App Group instead, so it launches instantly and cannot fail because the network is slow.

Firestore runs with offline persistence as the cache rather than as a fallback, so the app behaves the same with or without a connection. Anonymous auth happens in the background on launch, which means there is no sign-up and nothing to wait for.