Codicula app icon

Vibe coding, but with a hard goal: a GPUI-native, WYSIWYG Markdown editor that stays smooth.
Edit: ≤ 2 MiB Rendered view: ≤ 5 MiB Text view beyond

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Tip: You can also use the direct download links.
Built on a real parsing/rendering stack (GFM + tables + tasks + math), special renderers (Mermaid, Typst/MiTeX), and mode routing that refuses to jank on large documents.
Codicula preview (placeholder)
What we’re building
Codicula is an experiment in “how far can we get with vibe coding” — without hand-writing the whole editor — while still chasing the boring, hard constraints: correctness, smoothness, and a UI that feels native.

WYSIWYG Markdown (GPUI)

Render blocks/inline into a real layout, with cursor + selection + undo/redo.

Large-file mode routing

Edit ≤ 2 MiB. Rendered read-only ≤ 5 MiB. Fall back to text view beyond that.

Chunked parsing

Parse from rope chunks to avoid full document materialization in hot paths.

Math + Mermaid

Dedicated renderers for display math and Mermaid flowcharts, with caching.

Export pipelines

PDF via Typst, plus mdBook export pipeline foundations (multi-file, link rewrite).

Safe media viewing

Async image loading with budgets, plus sandboxed SVG rendering policy.

Screenshots (replace these placeholders)
Drop images into website/media/screenshots/ with the same filenames and refresh.
WYSIWYG editing screenshot (placeholder)

Editing

WYSIWYG layout, selection, and “feels-native” cursor movement.

media/screenshots/wysiwyg_edit.*
Large document handling screenshot (placeholder)

Big docs

Mode routing that keeps interaction predictable instead of pretending everything is editable.

media/screenshots/large_docs.*
Math and Mermaid screenshot (placeholder)

Math + diagrams

Display math and Mermaid flowcharts rendered as first-class blocks.

media/screenshots/math_mermaid.*
Micro-demos (video loops)
Keep them short, silent, and lightweight. Posters live in website/media/posters/, videos in website/media/videos/.

Editing loop

media/videos/editing_loop.*

Export loop

media/videos/export_loop.*

Latest Release

CI/CD publishes: Windows MSI + update ZIP, macOS universal DMG (+ app ZIP), Linux AppImage.

Note: Codicula is under very active development (updates are frequent, often on weekends). The release page is in testing and descriptions may be imperfect. Please use at your own discretion.
GitHub Release All Downloads Update Manifest Changelog