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Zephyr
v1.1.11 — out now

An editor that
AI CLIs can drive.

A Windows 10 or 11 code editor on Tauri 2, Rust, and React. About 9.5 MB on disk. An MCP server on port 9222 lets Claude Code, Codex, Gemini CLI, or opencode drive the window.

Download for WindowsView on GitHub

Site and editor are open source. Apache-2.0. No account.

$Windows 10 or 11Primary platform$Linux AppImageExperimental$Linux .debExperimental
on disk
~9.5 MB
on disk
ever
No telemetry
ever
open source
Apache-2.0
open source
MCP server
Port 9222
MCP server

00 · Inside the window

Editor, terminal, agent, and git in one frame.

Pick a pane to see what it holds. Everything below runs locally on your machine.

zephyr — Zephyr

Explorer
  • src
  • components
  • shell/
  • ZephyrLogo.tsx
  • panes/BrowserPane.tsx
  • lib/mcp.ts
  • app.tsx
  • src-tauri
  • src/mcp_server.rs
  • Cargo.toml
  • package.json
  • README.md

Screenshots

The real window, not a mockup.

Every shot below is an actual capture of Zephyr running on Windows. Filter by surface to see how the editor, terminal, git, agents, and MCP fit together.

Features

Six parts that had to work together, so they do.

Editor

Encoding detection for UTF-8, BOM, Windows-1252, UTF-16 LE and BE

Multi-file tabs, session restore, and split groups

Regex find and replace with a step cap, multiple cursors, code actions

Toolkit

More built in. No plugin required.

LSP

Per-language completion, hover, rename, and format. A language server starts when you open a file and stops after it goes idle.

Debugger

DAP with breakpoints, stepping, watch expressions, and a call stack.

Snippets

Reusable insertions, scoped per language.

Skills and memory

Plain files under %APPDATA% that the agent can call. No database, no migration.

Tasks

Detects build and test commands from the project, then runs them without you hunting for the right incantation.

Command palette

Every action in one list, virtualized so a large command set still opens instantly.

Quick Open

Fuzzy file search across the whole workspace, driven from the keyboard.

Extensions

Bundled packs plus Open VSX .vsix install. Static contributions only, so extension JavaScript never runs.

Timeline

File history with snapshots and restore.

Zen mode

Editor only. Everything else moves out of the way.

Screen reader mode

Reduced motion, forced high contrast, and visible focus rings throughout the window.

Tiny footprint

About 9.5 MB on disk. No Electron, no bundled Chromium, no always-on extension host.

Download · v1.1.11

Pick a build. Run it.

Windows 10 or 11 is the tested target and every Windows build is the officially supported one. The Linux AppImage and .deb builds are community-supported and experimental. No account, no telemetry. Signed releases on GitHub, and the app verifies the signature before it updates.

Windows

Primary platform
  • x86_64NSIS installerRecommended

    Zephyr_1.1.11_x64-setup.exe

    • Recommended for most people
    • SmartScreen may warn — choose More info, then Run anyway
    Download
  • x86_64MSI installer

    Zephyr_1.1.11_x64_en-US.msi

    • For managed or fleet deployments
    • Same signed build as the NSIS installer
    Download

The tested target. Fixes are built and verified on Windows first.

Linux

Experimental community build
  • AppImagex86_64

    Zephyr_1.1.11_amd64.AppImage

    • chmod +x, then run
    • No install step required
    Download
  • .debDebian / Ubuntu

    Zephyr_1.1.11_amd64.deb

    • Debian, Ubuntu, and derivatives
    • Installs system-wide
    Download

Not the tested target. Builds are best-effort, and issues are best filed against Windows.

Signed releases live on GitHub. The app verifies the minisign signature before it installs an update.

  • v1.1.11
  • Windows 10 or 11
  • Linux AppImage
  • Linux .deb

Install

Three steps and you are in.

Windows 10 or 11. WebView2 already ships with Windows 11, so on a fresh machine it usually just runs.

  1. 1

    Download the installer

    Grab the .exe or .msi from the download table above, or open the releases page directly.

  2. 2

    Run it

    SmartScreen may warn because the build is not signed with a paid certificate. Choose More info, then Run anyway.

  3. 3

    Open a folder

    Zephyr opens. Use Open Folder to load a project. Settings, keys, extensions, and logs live under %APPDATA%\zephyr — delete that folder for a full reset.

FAQ

Questions, answered plainly.

Neither. It is built from scratch on Tauri 2, React, and Rust. The renderer uses WebView2, which already ships with Windows, so no Chromium is bundled. That bundled Chromium is exactly where Electron's size and memory come from.

There is no always-on extension host and no bundled browser. A language server starts when you open a file of that type and shuts down after it goes idle, so you pay only for the languages you are actually editing.

Through Open VSX or a manual .vsix. Version 1 supports static contributions: languages, themes, snippets, keymaps, and command palette entries. Extension JavaScript is never executed, so extensions that need the full extension host do not work yet.

Over the MCP server on port 9222: HTTP JSON-RPC with a Bearer token, loopback only. Claude Code, Codex CLI, Gemini CLI, or opencode can open files, read terminal panes, and change editor buffers. editor_write only touches the buffer, so you save manually and a wrong edit never changes the file on disk.

Under %APPDATA%\zephyr\: settings, history, extensions, and logs. API keys are obfuscated with XOR and a BLAKE3 key, which is not real encryption. There is no telemetry, no analytics, and no crash reporting. Delete that folder for a full reset.

The installer is not signed with a paid code-signing certificate, so Windows shows a warning. The source is open and can be read in the GitHub repo. If you would rather build it yourself: install Node and Rust, then run npm install and npm run tauri build.

Yes, from 1.1.1 onward. Open Settings, then About, then Check for updates. The app verifies the release signature before it installs. Version 1.1.0 has no update endpoint and needs a manual install.

Windows 10 and 11 are the primary supported target. WebView2 already ships with Windows 11, so the installer usually just runs. Linux AppImage and .deb are published as experimental community builds, not the tested target. There is no macOS build.

Open a folder and let an agent take the first pass.

Register Zephyr with your CLI in one click, or download the installer and start typing. The source is open either way.

Download for WindowsRead the source