Native macOS App
Peek and Tweak_
Press Space in Finder. See formatted markdown — not raw code. Spot a typo? Fix it right there. Then move on.
A lightweight markdown viewer that fits your workflow. GitHub-exact rendering, QuickLook integration, and native Mac speed.
What is Peekdown?
Peekdown is a native macOS markdown viewer that integrates with Finder's QuickLook. Press Space on any .md file to see GitHub-exact formatting instantly—no app launch needed. Includes inline editing with synced scrolling, syntax highlighting for 20+ languages, and pin-on-top for documentation reference. Built with SwiftUI for native Mac speed (~6MB, ~50MB RAM).
Built for how you work
QuickLook Integration
Press Space in Finder to preview any markdown instantly. Full GitHub-style rendering, no app launch, no context switch.
GitHub-Exact Rendering
Stop pushing typos. Tables, task lists, code blocks, strikethrough—rendered exactly like GitHub does.
Edit Inline
Spot a typo? Fix it right there. Side-by-side editor with synced scrolling—no app switching required.
AI Context Files
CLAUDE.md, llms.txt, .cursorrules — see what AI sees. Auto-reloads when your IDE or AI edits it.
Pin on Top
Reference docs while you code—no window switching. Keep your preview floating above everything else.
Toggleable Checkboxes
Perfect for manually testing your stuff. Toggle checkboxes directly in preview with an optional auto-save.
Syntax Highlighting
20+ languages highlighted automatically. Your code snippets look exactly as they should.
Copy Code Blocks
One-click copy on every code block. Grab snippets instantly without selecting text.
Multiple Windows
Open as many files as you need. Each gets its own window with independent state and position.
Light & Dark Modes
Follows your system appearance. Proof your README in the same theme readers will see.
Editor Themes
Eight beautiful themes—Dracula, Monokai, Solarized, One Dark, Nord, and more.
Custom Fonts
Pick your favorite monospace—SF Mono, JetBrains Mono, Fira Code, and more.
One-time purchase. No subscription.
Preview without launching
Press Space in Finder on any .md file. See full GitHub-style rendering, syntax highlighting, tables, dark mode, the works. No app to open, no browser tab to manage. Just instant, rendered markdown anywhere you find it.
Spot it. Fix it.
Fix that broken table or missing backtick the moment you spot it. Side-by-side editing with synced scrolling means you're never guessing how your markdown will render.
Who it's for
Any Developer
Markdown files are everywhere
READMEs, docs, config files — peek at them properly. Press Space, see it rendered, move on.
AI-Assisted Developers
See what AI sees
CLAUDE.md in every project? See what AI assistants receive, tweak it fast.
Open Source Maintainers
Perfect READMEs, every time
Proof your documentation exactly as GitHub renders it before the world sees.
Documentation Writers
Write and proof in one place
Side-by-side editing with live preview. No more switching between your editor and browser to check formatting.
Why not just use VS Code?
Or preview in the browser after pushing?
| Peekdown | VS Code | Browser | |
|---|---|---|---|
| Download size | ~6MB | ~100MB+ | — |
| Memory usage | ~50MB | ~500MB+ | Tab soup |
| Startup time | Instant | Seconds | Push first |
| QuickLook | |||
| GitHub-exact | Close | (after push) | |
| llms.txt support | |||
| Pin on top | Extensions |
Get Peekdown
Less than a latte. No subscription.