The Markdown editor for the age of AI.

A what-you-see-is-what-you-get Markdown editor for researchers, data scientists, and AI engineers. Built for humans and agents alike.

01
Agent & Human Ready
Files stay plain Markdown, readable by any AI model or any person, as-is.
02
What You See Is What You Get
No split panes. No preview mode. Headings, tables, and math render as you type. Click to edit.
03
Minimal by Design
A distraction-free canvas. Nothing between you and the document.
Apple Silicon Intel Mac

macOS app  ·  Free  ·  No account required
Also available as a VS Code extension

v0.5.0

Features

Everything you need. Nothing you don't.

True WYSIWYG
Headings, bold, tables, and task lists render live as you type. Click anywhere to edit raw syntax.
Math & Diagrams
KaTeX inline and block math. Mermaid flowcharts and sequence diagrams, rendered live in the editor.
Code Blocks
Syntax highlighting for Python, R, TypeScript, Julia, Go, Rust, and more.
32+ Themes
Including the new Biorouter Light & Dark, plus GitHub, Material, IBM Carbon, NASA, Spotify, and more. Customizable YAML-based theme files.
Multi-Tab & Multi-Window
Drag tabs to detach into separate windows. Autosave every 30 s. Crash recovery on next open.
Export
HTML (self-contained, KaTeX + Mermaid bundled) and PDF via Pandoc with proper typesetting.
File Format Support
Opens .md, .txt, .py, .r, .json, .yaml, .toml, .tex, .sql, .html, .ts, .go, .rs, and more.
Mermaid Diagrams
Visualize workflows, pipelines, and skill maps with live Mermaid diagrams. Great for agents and researchers.
Quick Look Preview NEW
Press the spacebar on any Markdown file in Finder to see a fully rendered Bioscratch preview — tables, math, code, and diagrams — without opening the app.
For Visual Studio Code

The same editor, right inside VS Code.

Bioscratch now ships as a VS Code extension. Open any .md file and edit it as a live document — while VS Code keeps full ownership of saving, undo, hot exit, and Git. The file on disk stays clean Markdown.

  • True WYSIWYG for headings, lists, tables, and links — rendered live, edited in place.
  • KaTeX math, Mermaid diagrams, and syntax highlighting render as you type.
  • Native to your workflow — VS Code owns save, undo/redo, hot exit, and the dirty indicator.
  • 30+ themes, or Match VS Code theme to follow your active color theme automatically.
Install from Marketplace View on GitHub
Install
code --install-extension \ WanjunGu.bioscratch

…or search for Bioscratch in the Extensions view. Bioscratch becomes the default editor for Markdown files — switch back anytime with Reopen Editor With….

Download

Available for macOS.

macOS · Apple Silicon & Intel
Download for Apple Silicon Download for Intel Mac

macOS app  ·  Free  ·  No account required
PDF export requires Pandoc  brew install pandoc
Prefer your editor? Get the VS Code extension.

What’s new in v0.5.0 →  ·  All releases

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v0.5.0