Latest Version is v2026.10.05

Consider supporting me on KO-FI

PLEASE REPORT BUGS/PROBLEMS ON GITHUB

Accessible Stylish Themes for FreeCAD

This is a set of light and dark color-impaired accessible aesthetically pleasing themes (OpenLight and OpenDark) for FreeCAD based on the Open-Color Palette that is WCAG/APCA compliant.

Installation

These themes should be installed via the Addon Manager.

The themes style FreeCAD. If you want recommended settings, and UI layout apply the OpenPreferences pack.

APPLYING A PREFERENCE PACK IS A ONE-WAY PROCESS. Consider backing up your user.cfg file before applying.

...or by saving your existing settings in a new preference pack.

Screenshots

How the themes are built

Requires a FreeCAD version with style parameters (theme tokens in .yaml files). For older versions use the OpenTheme_Legacy branch.

• The stylesheets contain no colours. They use role tokens such as @TextPrimary and @SurfaceBase, and FreeCAD fills them in from the active pack's parameters/<Pack>.yaml.
• Every pack uses one stylesheet, OpenTheme.qss, and one overlay stylesheet. Both live in the OpenDark folder with the images (opentheme_images), so that pack must stay installed and visible. Every other pack holds only a .yaml and a .cfg.
• Images come in sets, <name>_ondark.svg, <name>_onlight.svg and <name>_onsystem.svg. A pack's IconVariant token picks the set.
• Each theme is defined by a plain text file in tools/themes/. ./build.sh compiles the stylesheets with qtsass and runs tools/make_themes.py, which writes every pack's .yaml and .cfg and the pack list in package.xml.
• OpenDark and OpenLight are built from ten seed colours; every other colour is a blend of those. Their .cfg files are hand-made and are the starting point for other themes' 3D view, Sketcher and editor colours.
• OpenSystem takes its widget colours from the desktop (Qt palette(...) colours). It uses the neutral _onsystem glyphs, regenerated with python3 tools/make_system_glyphs.py ., and sets a mid-grey 3D view that suits a light or dark desktop.
• python3 tools/make_themes.py --check lists stylesheet tokens with no role and contrast pairs below WCAG minimums.
• To add a role, define it in scss/_tokens.scss and in ROLE_GROUPS in tools/make_themes.py.
• tools/themes-saved/ holds seed-based definitions for other palettes (Catppuccin, Nord, Dracula and more). Move one into tools/themes/ and rebuild to enable it.

Making your own theme

Every theme is a plain text file in tools/themes/, one colour per line (Name = colour). Copy one, rename it, change the colours, then run python3 tools/make_themes.py. tools/themes/README.md explains each entry.

License

LGPLv2