Legal
Helicon is MIT licensed, free, and an unofficial community project that is not made, sponsored or endorsed by Meta. It has no account and no telemetry, and it never stores credentials. Muse and Muse Code are Meta trademarks, used here only to describe what Helicon connects to.
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The documents
| Document | What it covers |
|---|---|
| Privacy | What the app sends, which is an update check, and what this website's analytics record |
| Terms | The MIT licence in plain words, no warranty, and who is responsible for what an agent does |
| MIT licence | The licence itself, in the repository. It is the document that governs |
| Security policy | How to report a vulnerability. Do not open a public issue for one |
The short version
- Free and MIT licensed. No paid tier, no account, no second bill. Any version you have stays yours.
- Unofficial. Not made, sponsored or endorsed by Meta, and unrelated to the Muse assistant app for Mac.
- No credential custody. Authentication stays with your own
muse login, held by the CLI. - No telemetry in the app. One update check, reporting platform, version and a weekly hash of the IP.
- Nothing leaves your machine. Not your code, prompts, threads or files.
- No warranty. The MIT licence provides the software as is. You own what you approve.
Trademarks
Muse and Muse Code are trademarks of Meta. They appear on this site only to say what Helicon works with, which is nominative use: there is no way to describe a client for Muse Code without naming Muse Code. The project is deliberately called Helicon rather than anything containing Muse, and the binary, bundle identifier and domain follow the same rule.
Other names on this site, including Cursor, Windsurf, Zed, JetBrains, Claude Code, Codex, OpenCode, Aider, Cline and Warp, belong to their respective owners and are used the same way, to compare honestly rather than to imply any relationship.
Frequently asked questions
Is Helicon affiliated with Meta?
No. It is an unofficial community project. Muse and Muse Code are Meta trademarks, used here only to describe what Helicon connects to.
What licence is Helicon under?
MIT. Use, modify, redistribute and sell it, commercially included, as long as the copyright notice and licence text travel with it.
Where do I report a security issue?
SECURITY.md in the repository has the process. Do not open a public issue for a vulnerability.
Keep reading
- PrivacyThe Helicon desktop app has no account and no telemetry. It checks for updates and nothing else. This site uses analytics. Here is exactly what each one records.
- TermsHelicon is MIT licensed and provided without warranty. It is an unofficial community project, not made or endorsed by Meta, and you remain responsible for what the agent does.
- PricingHelicon is free and MIT licensed with no paid tier, no account and no API key. It uses the Muse Code subscription you already pay Meta for.
- Muse Code desktop appHelicon is a free, open-source desktop and web app for the Muse Code CLI. Signed Windows installer, universal macOS DMG, sessions, diffs, approvals and cost in one window.
Same Muse Code. Same subscription. Better interface.
Free and MIT licensed. Signed Windows installer, universal macOS DMG, and a web build against a daemon you run.