Getting started

OpenThunder Desktop is a free desktop app that bundles the local server and the CLI. Everything runs on your machine; no account is required.

1. Install

Download OpenThunder Desktop for macOS, Windows, or Linux from openthunder.dev. One file; open it like any desktop app.

Prefer zero install? The free diff review tool runs entirely in your browser: paste a git diff, get an instant change review. Nothing to download, nothing uploaded.

2. Open a repo

Launch OpenThunder and point it at any project folder. It maps the repo locally; no setup file is required to start.

3. First value, under 5 minutes

Pick any of these; each works offline with no AI key:

• Run a scan. Open the Architecture, Security, or Code Health Lens and read the scorecard: what the system looks like, where the risk is, what needs attention. From the CLI: openthunder scan or openthunder lens.
• Generate an AI Context Pack. A paste-ready context block for Claude Code, Cursor, Copilot, or Codex, built from real repo intelligence: openthunder context-pack.
• Review a diff. See files touched, risk level, likely missing tests, and breakage risks for your current change: openthunder review-diff.

4. Where to go next

• Core concepts: what Missions, Lenses, and Change Verification actually are.
• CLI reference: every command, generated from the real help output.
• Privacy FAQ: what stays local (short answer: everything, by default).