Installing the app

The app is distributed as a signed APK on GitHub. Installing it takes about a minute.

1. Download the APK on your phone: opensolr-mail.apk, the latest release.
2. Allow the install. Android asks once whether your browser may install apps. Allow it for this install.
3. Open Opensolr Mail and sign in to Fastmail. See signing in.
4. Allow notifications when Android asks, so new mail can reach you.

Every release is signed with the same key. To check an APK before installing it, on a computer with the Android build tools:

The SHA-256 digest of the signer certificate must be:

When it starts, at most once a day, the app looks at the latest release on GitHub. When a newer one exists, Settings → Updates shows what is new and an Update to X button. The app downloads the new APK itself, checks that it carries the same signature and is really newer, and hands it to Android’s installer. Nothing is installed without you tapping the button.

• The first time, Android asks you to allow installs from Opensolr Mail. Allow it, come back and tap the button again.
• Check, in the same place, asks GitHub on the spot.
• A copy installed from a store is updated by that store, Google Play or AppGallery: the app does not look for updates itself, and the button opens its page in that store.

Uninstalling removes the app and everything it kept on the phone. Your mail stays in Fastmail. If you connected Opensolr, the mail index stays in your Opensolr account; delete it from the control panel if you no longer want it.