Lagrange is a GUI client for browsing Geminispace. It offers modern conveniences familiar from web browsers, such as smooth scrolling, inline image viewing, multiple tabs, visual themes, Unicode fonts, bookmarks, history, and page outlines.

Like Gemini, Lagrange has been designed with minimalism in mind. It depends on a small number of essential libraries. It is written in C and uses SDL for hardware-accelerated graphics. OpenSSL is used for secure communications.



Prebuilt binaries are available for Windows 64-bit, macOS 10.13 or later, and Linux AppImage (x86_64 and armhf):



You can build from source on POSIX-compatible platforms:

What's new?



If you have questions, comments or improvement ideas, you can reach me via:

Known issues


Flatpak applications run in a sandbox that limits their access to the rest of the system. At the moment, Lagrange has not been fully adapted to use Flatpak Portal APIs, so the following are known issues:


The environment variable `SDL_VIDEODRIVER=wayland` can be used to force SDL to use Wayland instead of X11. However, SDL does not have full support for Wayland at the moment. You should set the Lagrange CMake build option ENABLE_POPUP_MENUS to NO. If there are issues with resizing windows, also set ENABLE_RESIZE_DRAW to NO.

Documentation and tutorials

The repository README details the basic build steps, configuration options, and has a few platform-specific notes.

A thorough walkthrough of how to upload text and files via Titan using the (beta) version of Lagrange on an iPhone.

See also

The original Gemtext version of this page can be accessed with a Gemini client: gemini://