Opus is a cold, monospace-forward theme with a small, consistent color system. Color is used sparingly and always means something: one accent for structure and the active item, teal for good, clay for warning. Headings are monospace and separate by size and weight rather than color, so long notes stay calm. The same accent marks the active file, the active tab, and the active table row — the app reads the same way everywhere.
Six flavors — Named for the stages of the alchemical opus, switchable in Style Settings, each a full palette in light and dark:
| Flavor | Stage | Palette |
|---|---|---|
| Prima Materia | the first matter (default) | cold blue-slate + amber |
| Nigredo | the blackening | near-black, high contrast |
| Albedo | the whitening | pale silver |
| Citrinitas | the yellowing | warm gold |
| Rubedo | the reddening | oxblood + crimson |
| Verdigris | copper patina | cool cyan-green |
With [Style Settings] you also get an accent-color picker (teal/clay stay fixed), a compact/density mode, line-width and font sliders, sans-heading and font overrides, OLED true-black, and a mobile section. Without the plugin it runs fine on Prima Materia.
Also covered: callouts, code (comments read as muted slate, matched in Reading and Live Preview), native + Dataview tables, Kanban, Canvas (the six preset colors remapped to a quieter set), Properties, and print. Tuned for mobile too.
Install: Appearance → Manage themes → search Opus
Built it for my own operator/intel notes and figured others might want the same restraint. Happy to hear what breaks or what you’d want as a seventh flavor.