Calepin is a fast rendering engine for Quarto-compatible notebooks, written in Rust. It turns .qmd files into HTML, LaTeX, Typst, or Markdown, executes R and Python code chunks, and builds scientific notebooks, articles, books, websites and documentation pages.

The name Calepin comes from the French word for a small pocket notebook.

Fast:

• Sub-millisecond rendering for typical notebooks.
• Render tens of thousands of documents in seconds.
• Smart caching of code chunk outputs and rendered documents.
• Instant updates every time you save the file.
• Written in Rust.

Extensible:

• Write filters, transforms, custom functions, and postprocessors in Python, R, shell, or anything that reads JSON.
• Override any template with plain HTML, LaTeX, or Typst. No need to learn Rust, Go, Lua, or yet another nerdy language.

Templates everywhere:

• Override any element by dropping a file in _calepin/partials/.
• Figures, tables, code blocks, callouts, theorems, equations, citations, footnotes.
• Page wrapper, title block, author block, appendix, license, funding.
• Navbar, sidebar, footer, breadcrumbs, search, theme toggle, source viewer.
• One CSS file. One TOML file.

LLM-friendly:

• File formats that LLM agents know and can edit directly: Markdown, HTML, Jinja, TOML.
• Classless HTML. No complicated frameworks or messy classes.
• Simple CSS. No preprocessor; no Javascript build step.

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