CodePad app icon Native app · macOS & Windows · from Lasiako

The developer's notepad —
instant, themed, every format.

Open anything, see it highlighted, clean it up, move on. CodePad is a fast, light editor on its own Rust engine — not a browser pretending to be one — with real syntax for dozens of languages, built-in formatters, and AI help only when you ask for it.

Download See features
Own editor engine 21+ languages Format & convert 44 themes
What's inside

Fast where it counts, quiet everywhere else.

The editor you reach for a hundred times a day — so it opens instantly and gets out of the way.

Its own engine

A Rust rope buffer with tree-sitter syntax — not Monaco, not CodeMirror. It stays fast on big files where web editors crawl.

Every format

Real syntax highlighting for 21+ languages and data formats, themed by 44 curated palettes.

Format & convert

Tidy JSON, Markdown, Rust, Python, TOML and more with embedded formatters — one keystroke, no toolchain to install.

44 themes

The shared Lumina theme system — pick a look, light or dark, and it carries across the whole app.

AI assist, opt-in

Explain, refactor or convert a selection when you want it — off by default, and it never touches your file unless you say so.

Instant & light

Native shells (Tauri and a wgpu build) start in a blink and sip memory — it's a notepad, not an IDE.

Handles it all

One editor, every file on your disk.

Code, config, data, notes — open it and it just reads right.

JSONMarkdownRustPythonTypeScript GoTOMLYAMLHTML / CSSSQL ShellXMLCSVDiff…and more
Thoughtful, optional AI

AI when you want it — never in the way.

Select a block and ask CodePad to explain it, refactor it, or convert it to another format. Bring your own key, keep it off entirely, or run a local model — nothing leaves your machine unless you choose, and it never edits your file without your say-so.

Explain a selectionRefactorConvert formats Bring your own keyLocal modelsOff by default

Get CodePad.

Free while in beta. Native on Apple Silicon & Intel Macs, and on Windows.

Download for Mac (.dmg) Windows (.exe) ← All Lasiako products

Beta builds, not yet code-signed — macOS and Windows will ask you to approve the app once. See the note below if you hit a warning.

⚠ First launch warning? Here's how to open it ›
  1. macOS: open the .dmg, drag CodePad to Applications, then on first launch click Done (not "Move to Trash") → open System Settings → Privacy & Security → click Open Anyway.
  2. Windows: if SmartScreen appears, click More info → Run anyway.

On a Mac Terminal, one command clears it:
xattr -dr com.apple.quarantine /Applications/CodePad.app

This step exists only because the app isn't code-signed yet — it's the same build you see here, just not stamped by Apple/Microsoft's paid signing service.