LocalSend: AirDrop-style transfer with zero cloud
LocalSend answers a sharp product question: can two devices exchange files without an account or a server? Yes — if you design for LAN discovery, HTTPS, and explicit consent.
Design highlights
- Peer protocol over local HTTPS (commonly associated with port 53317).
- Flutter UI with Rust/native pieces for performance-critical paths.
- No cloud control plane — privacy is the feature.
Steal this
- Discovery + consent UX is half the product.
- Make transfers resumable and visible; silent failures destroy trust.
- Keep a CLI headless mode for power users and automation.
Pitfalls
- Mobile OS background limits kill naive long transfers.
- Mixed networks (AP isolation, VPN, captive portals) will generate support load — document them.
Study LocalSend when you need local-first product patterns, not just a package to copy.