WHAT IS IT?
AltSendme is a peer-to-peer file transfer app that moves data straight from one device to another, without going through a cloud. You drop a file or folder, it generates a ticket (a one-time code) that the recipient pastes to start the transfer. It's a GUI alternative to the sendme CLI, built on the Iroh library for the networking side.
WHY IS IT INTERESTING?
- Genuinely peer-to-peer: direct device-to-device connection when possible, with an encrypted relay as fallback when direct doesn't get through.
- End-to-end encrypted: QUIC + TLS 1.3, BLAKE3 integrity, Ed25519 authentication. Relays only ever see encrypted traffic.
- No account, no limits: no sign-up, no tracking, no ads, and it handles huge files (tested to hundreds of GB).
- Cross-platform: Windows, macOS, Linux, Android, plus a web version and the CLI, all in Tauri.
- Sturdy transfers: resumable after a drop, throughput that saturates a gigabit link (~125 MB/s measured).
USE CASES
- Send a large file to someone without uploading it to a third-party service.
- Move files between your own devices, whatever the platform.
- Share sensitive data with no cloud intermediary.
- Distribute a very large dataset or archive without splitting it.