File Sync

Syncthing81.2k★

If you want to sync files between your devices without trusting a cloud provider — your laptop, your phone, your NAS, your server — Syncthing does peer-to-peer file synchronization. No central server, no account, no subscription. Your files go directly between your devices, encrypted in transit. 81K stars, Mozilla Public License 2.0, written in Go. It's like Dropbox but you own every piece of it. Set it up on two devices, point them at a folder, and changes sync automatically. It handles conflict resolution, versioning, and works across NATs without port forwarding (using relay servers for discovery, but actual data transfer is direct when possible). Everything is free. No paid tier, no premium features, no cloud storage costs. You're using your own devices' storage. The catch: there's no web interface for accessing files remotely — it syncs between devices that are running Syncthing. If your laptop is off, your phone can't pull a file from it. Dropbox/Google Drive solve this with always-on cloud storage. Syncthing also requires at least basic technical comfort to set up — it's not "install and drag to folder" simple. And mobile support (Android) works but is a second-class citizen compared to the desktop experience. iOS has no official app.