Version 0.1.0 · free

The Intelligent
Development Environment

A fast, small code editor with Claude built in. Everything you reach for in VS Code — explorer, search, terminal, Git — in an app that downloads in seconds.

Download Try it in your browser →

macOS · Windows · Linux · Android · iOS · Web — the Mac and Windows apps download in a few MB

Libella with the sample project open: file tree, editor and the Libella AI panel in Agent mode

Everything you need. Nothing heavy.

Libella uses your system's own web engine and a small Rust core instead of bundling a browser, so the whole app is about 7 MB on a Mac.

An editor that keeps up

Around 140 languages, multi-cursor, folding, minimap, split view, Markdown preview and Vim mode. Opens big files instantly.

Find anything

⌘P fuzzy file search, ⇧⌘P command palette, and project-wide search & replace with regex — powered by the engine behind ripgrep.

A real terminal

Your login shell in true colour, several tabs, clickable links. Run builds and tests without leaving the editor.

Git, built in

See changes, read diffs, stage, commit, sync and switch branches. Uses your installed Git and its credentials.

Extensions & themes

Install VS Code colour themes and snippets from Open VSX — Dracula, One Dark Pro, Catppuccin, GitHub and thousands more — plus Libella extensions like Prettier, sandboxed so they can't touch the network.

Your keyboard habits

VS Code shortcuts out of the box: ⌘B, ⌘J, ⌃`, ⌘\, ⌘W, ⇧⌘T and the rest.

On every device

The same Libella on macOS, Windows, Linux, Android and iOS, plus a web version that opens folders straight from your disk.

Libella AI

An assistant that asks before it acts.

Chat about your code. The open file and your selection come along automatically.
Edit in place with ⌘I: describe the change, review the diff, accept.
Agent mode reads, searches and edits across your project and runs your tests. Every file change and every command waits for your OK.
Commit messages written from your staged changes.

Libella AI runs on Claude (Opus 5 by default; Sonnet, Haiku and Fable available) with your own Anthropic API key. The key stays on your device and requests go straight to Anthropic — Libella has no server in the middle.

Add input validation to the signup form and run the tests

Read src/forms/signup.ts

Edit src/forms/signup.ts needs your OK

- if (!email) return;
+ if (!isEmail(email)) return error("Enter a valid email");
+ if (password.length < 8) return error("Use 8+ characters");

DeclineAccept

Download Libella

Free. No account. Version 0.1.0.

macOSApple silicon · DMG · 7 MB Windows10 and 11 · installer · coming soon Linux.deb / .rpm · coming soon AndroidAPK · coming soon iPhone & iPadApp Store · coming soon WebChrome or Edge open real folders · other browsers keep projects in the browser

Windows says “Windows protected your PC”?

The Windows installer isn't code-signed yet, so SmartScreen asks once: choose More info → Run anyway. The Mac app is signed and notarized by Apple and opens straight away.

Questions

Can I use my VS Code extensions?

Colour themes and snippets, yes: the Extensions view (⇧⌘X) installs them straight from Open VSX, the open VS Code marketplace. Extensions that run code need VS Code's Node.js extension host, so Libella has its own extensions for those — Prettier, Text Tools and TODO Finder to start with — each running in a sandbox.

Does Libella send my code anywhere?

Only when you use Libella AI, and then only to Anthropic's API with your own key: the open file, your selection and the files the agent reads. Nothing else leaves your device.

How much does Libella AI cost?

Libella is free. Claude usage is billed by Anthropic to your API key at their standard prices; each answer shows how many tokens it used.

Why is it so small?

Libella is built with Tauri: the interface runs in the web engine your system already has, and the heavy lifting (files, search, terminal) is done by a small Rust core.

The IntelligentDevelopment Environment