★ 17k
September 2026
MIT
Everyday life
What we checked ourselves
Not copied from the project's own blurb. These are things we opened and verified, with the date.
- 6 Sept 2026We checked that the link to the project still resolves.
- 13 Sept 2026We read the licence text itself (LICENSE.md). No unusual restrictions were stated.
- 30 Aug 2026We read the project's own documentation and found no sign that development has stopped.
Where this sits among the 44 tools we list in Everyday life
- No API key required40 of 44
- Commercial use confirmed as allowed29 of 44
- Requires terminal commands26 that do not →
- Sends your input to the provider20 that do not →
Only 26 of the 44 meet all of the conditions above.
Counted from our own checks: every tool we list is examined against the same criteria.
What it does
Voice or text in, skills you add yourself, running on your own machine — a long-running open-source take on the personal assistant, with the privacy properties that follow from self-hosting. Read the author's own status note before committing: the core is being rewritten with breaking changes, outside contributions are paused, and the work happens after hours because it is not funded. Fine if you are here for the architecture or the long game, less so if you need something usable this week. MIT.
Summary based on the project's own description. The Japanese page has a fuller beginner guide: setup difficulty, what to prepare, and a step-by-step start.
Screenshots & visuals
Before you start
- Setup difficultyEasy to start
- Command lineRequired
- API keyNot required
- Sends data onlineYes
Judged automatically from the project's own metadata. Always confirm on the official page.
leon FAQ
- Is leon free?
- Yes. It runs on your own machine, so there is no usage-based cost either.
- Do I need to install anything or write code to use leon?
- It needs the command line. If you are not comfortable typing commands, expect to get stuck during setup.
- Does leon work on a phone?
- No. It needs a computer.
- Can I use leon commercially?
- The licence is MIT, which permits commercial use. Conditions such as keeping the copyright notice still apply, so read the licence text before shipping it inside something.
How it compares
The conditions that decide whether you can actually use it, side by side.
| Tool | Command line | API key | Sends data out | Phone | Commercial use |
|---|---|---|---|---|---|
| leon (this page) | Required | Not needed | Yes | No | Yes |
| dicio-android | Not needed | Not needed | No | Yes | Yes |
| Immich | Required | Not needed | No | No | Yes |
| Stirling-PDF | Required | Not needed | No | No | Yes |
"Sends data out" means your input is uploaded to someone's server. Pick "No" when the material cannot leave your organisation.