Fastxt App is a tool to save and sync your text in local SQLite database without going through any centralized service.
You can also sync between other devices (desktop or mobile) by scanning QR code generated as server in the app.
Use two devices on the same network (Wi-Fi/LAN)
1. choose one device A to be the server, create some entries, Sync->Start Server, QR code should be generated.
2. another device B as the client, create some entries, Sync->Scan the QR code on device A->Start Sync
3. expected the records on A append to B, and records on B append to A, if the address:port value is invalid, then no effect.
Video shows sync between desktop and iPad
https://www.youtube.com/watch?v=tZhbwV_a0fs