ArkDB is a local-first sync engine: one runtime in Rust, a domain written in plain Rust, and the phones embedding the same kernel. harken, a music library with playlists, is the first app on it. Revelation, the second app, is the Bible as one scroll zoomed like a map: an Android app in plain Kotlin, on none of ArkDB. The source is at github.com/k2on/apps.
fdroid/repo is every Android app as an F-Droid repository: add that address in F-Droid and each APK built from main arrives as an update.