Playground

Everything nothelix renders in the buffer runs through one Rust core, libnothelix. That core also compiles to WebAssembly, so the widgets below run the actual nothelix code in your browser. The text you type is handed to the exact functions the editor calls, not a reimplementation of them.

There is no server and no round trip. About 400 KB of WebAssembly loads once when you open the page, and everything after that runs locally.

Math reads like mathematics

In a notebook, inline LaTeX inside $…$ is concealed to Unicode as you type. \alpha becomes α, \mathbb{R} becomes ℝ, and x_1 becomes a real subscript. The source on disk stays plain LaTeX, and only the display changes. Type into the box and watch the buffer line update the way the editor would.

inline math conceal

loading WebAssembly…

Given $\alpha \in \mathbb{R}$ with $x_1^2 + \beta_i$.

↓ what the editor shows in the buffer

Display equations, typeset

A $$…$$ block is laid out as a typeset equation. Type LaTeX into the box and watch it set.

display math, typeset

\hat{\theta} = (X^\top X)^{-1} X^\top y

↓ typeset the way the buffer shows it

Backslash completion

Start a symbol with a backslash and nothelix offers the Unicode it maps to. This is the same list the completion popup shows in the editor.

backslash completion

\alph

↓ candidates libnothelix returns

Export to Typst

:export-typst turns a markdown cell into Typst source, carrying headings, emphasis, and LaTeX math across. Tables become native Typst tables, and headings keep their math.

markdown → Typst export

# Results The estimator $\hat{\theta}$ is **unbiased** when $\mathbb{E}[\hat{\theta}] = \theta$.

↓ Typst source from :export-typst

The equation above is typeset by KaTeX for this page. In the editor the same LaTeX is rendered by Typst into an inline image. See Rendering for how that reaches the buffer.