LocalSend, an open‑source cross‑platform app, lets users ship files and messages over a local network without internet. Built on a REST API and HTTPS, it generates TLS certificates per device, eliminating third‑party servers. The project is hosted on GitHub under the *localsend* organization and welcomes contributions from the community for developers and designers alike.

Unlike AirDrop, LocalSend runs entirely on the client side, so no Apple or Google infrastructure is involved. The app ships binaries for Windows, macOS, Linux, Android, iOS, and even Fire OS through popular package managers such as Homebrew, Chocolatey, and Snap. Users install via app stores or direct downloads, then open the app and pair devices within the same WLAN.

Security hinges on HTTPS and dynamic TLS certificates, so every transfer stays encrypted end‑to‑end. The protocol uses a lightweight REST API interface, which developers can inspect or extend in the source code. LocalSend also offers a portable mode; placing an empty settings.json beside the executable lets the app store preferences in the same folder, useful for scripting and CI pipelines.

Building the app requires Flutter (version specified in .fvmrc) and Rust, after cloning the repository and running ‘flutter pub get’ and ‘flutter run’. Contributors can submit pull requests for bug fixes or feature ideas, and the project hosts translations on Weblate. With no external server dependency, LocalSend offers a fast, privacy‑first alternative for teams and developers working offline.