Fontra vs Runebender

Fontra is a free, open-source browser-based font editor designed around variable fonts. It was initially developed to make designing and producing large CJK fonts more efficient. Its architecture combines a JavaScript browser client and Python server, which can run locally or remotely. Fontra Pak bundles the application for desktop use and local file editing; a remote server setup allows real-time collaboration among users, with changes propagating across windows. The project supports reading and writing Designspace and UFO files, as well as reading and exporting TTF and OTF files, including variable fonts. Editing features include live text entry, designspace axis navigation, interpolation, OpenType features, outline editing, components, anchors, guidelines, background images, transformations, kerning, font metadata and variation-axis mapping. Fontra Pak has binaries for macOS 11 and newer, Windows 10 and newer, and Ubuntu x86_64. Linux users can also use Flatpak or Snap; source compilation is listed for other architectures such as ARM or PPC. The repository is licensed under GPL-3.0.

Runebender is a free font editor for UFO and Designspace sources, with tools for glyphs, paths, filters, components, anchors, masters, interpolation, spacing, kerning, feature code, color fonts, text shaping, font information, and font checking. It opens UFO and Designspace files, Glyphs files and packages, and compiled TTF or OTF fonts; Glyphs files are converted to UFO, while compiled fonts are opened as UFOs in memory. Babelfont packages can also be imported. Experimental local models can suggest a heavier glyph master from a lighter one, and local chat is available through font-ml. The browser editor runs on the user's machine without uploading files, but it has interaction gaps and is not recommended for real work. The native application has no packaged release and is installed from source with Cargo. Runebender is alpha software and writes UFO and Designspace files in place, so the documentation advises working on copies and keeping sources under version control. The project is licensed Apache-2.0 or MIT and maintained independently, not as an official Linebender project.