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Runebender
What it is
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 open 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. Runebender is alpha software and has no packaged native release; the native application is installed from source with Cargo. Its experimental WebAssembly browser version works locally without uploading files, but has interaction gaps and is not recommended for real work. The editor writes UFO and Designspace files in place, so the documentation advises using copies and version control. The project is licensed Apache-2.0 or MIT and is maintained independently, not as an official Linebender project.
For and against
For
- Covers glyph editing, spacing, kerning, and feature code.
- Opens UFO, Designspace, Glyphs, TTF, and OTF files.
- Experimental local models can suggest heavier glyph masters.
- Browser build runs locally without uploading files.
- Costs nothing and uses Apache-2.0 or MIT licensing.
Against
- Native application has no packaged release.
- Native installation is from source with Cargo.
- Browser build has interaction gaps and is not recommended for real work.
- Writes source files in place.
The verdict
Runebender covers a wide range of font-editing work and supports several source and compiled font formats. Its alpha status, source-based native installation, and in-place file changes call for care; the browser build is not recommended for real work.
Who it suits
Runebender may suit font designers working with UFO or Designspace sources who are comfortable with alpha software and source-based installation.
Plans and prices
Free and open source
No cost · Alpha software · Native editor and experimental browser build
Read 3 Oct 2026 · runebender.org
On the record
- Agent integration
- An experimental MCP interface can connect an agent to the open native editor and its unsaved font; the client controls model authentication and provider selection, and a hosted model may receive font data returned to the client.runebender.org · read 3 Oct 2026
- AI features
- Experimental local models can propose a heavier glyph master from a lighter one, while local chat is available through font-ml.runebender.org · read 3 Oct 2026
- AI privacy
- The local model workflow runs on the user's machine and the documentation says drawings are not sent anywhere; it requires users to provide model files, which the editor does not download.runebender.org · read 3 Oct 2026
- Browser privacy and limits
- The experimental WebAssembly browser editor runs locally without uploading files, but has documented interaction gaps and is not recommended for real work.runebender.org · read 3 Oct 2026
- Editing features
- The documentation covers glyph editing, paths and filters, components and anchors, masters and interpolation, spacing and kerning, feature code, color fonts, text shaping, font info, and font checking.runebender.org · read 3 Oct 2026
- File support
- It opens UFO, Designspace, Glyphs files and packages, and compiled TTF or OTF fonts; Glyphs files are converted to UFO, and compiled fonts are opened as UFOs in memory.runebender.org · read 3 Oct 2026
- Installation
- The project has no packaged release yet; the native application is installed from source with Cargo, and the browser build can be opened on the site.runebender.org · read 3 Oct 2026
- License and project status
- The FAQ says Runebender costs nothing and is licensed Apache-2.0 or MIT; it is maintained independently and is not an official Linebender project.runebender.org · read 3 Oct 2026
- Stability and source safety
- Runebender is alpha software and writes UFO and Designspace files in place, so its documentation advises keeping sources under version control and working on copies.runebender.org · read 3 Oct 2026
- Support
- The FAQ directs users to open an issue in the project repository for help.runebender.org · read 3 Oct 2026
- What it does
- Runebender is a font editor for UFO and Designspace font sources.runebender.org · read 3 Oct 2026
- Workflow formats
- Runebender uses UFO and Designspace font source formats by default and can import Glyphs files, Glyphs packages, Babelfont packages, and compiled TTF and OTF fonts.runebender.org · read 3 Oct 2026
