# SimplySync

> App-owned, end-to-end-encrypted, local-first sync: apps write to a local
> SQLite database first and sync opportunistically through a relay that only
> ever sees ciphertext. The TypeScript, Kotlin, and Swift clients share one
> wire contract with the source-owned Cloudflare relay.

For single-user apps across a person's own devices — notes, journals, personal
finance, health trackers, local AI chat. Not for live multi-user collaboration,
teams and sharing, or server-side reads of user data: conflicts resolve
row-level last-write-wins, and the relay cannot decrypt anything.

Start with "For agents" — it is the dense contract for writing correct app code.
Fetch llms-full.txt for every page below in a single request.

## Docs
- [For agents](agents.html)
- [What & why](docs.html)
- [Client API (React)](guide.html)
- [How it works](architecture.html)
- [Sync & relay](sync.html)
- [Native clients](native.html)
- [Self-hosting](self-hosting.html)
- [Client API (Swift)](guide-swift.html)
- [Client API (Kotlin)](guide-kotlin.html)
- [Everything, concatenated](llms-full.txt)