Will the Android app update itself?

If you got it from the Google Play Store, yes, it updates on its own like your other apps. If you downloaded it straight from our website, your phone will not update it automatically, that is just how Android works for apps that do not come from the Play Store.

So instead, the app checks for new versions and shows a "New version available" message when one is ready. Tap it, and the update installs right over the old version, with all your notes and settings still there. The check only looks for a newer version, it never touches your notes, which stay encrypted the whole time.