Legal
Licences
Last updated 25 July 2026
We would rather be exact about this than use "open" as a marketing word.
What is open
- The firmware source is published under the MIT licence.
- The local device API is documented and stable enough to build on. See the API reference.
- The wiring is fully documented on the build page.
What is not open, yet
- Editable hardware sources. There is no published schematic or enclosure file, so we do not describe the project as open hardware. Open hardware means editable sources under an explicit licence, and until that exists the claim would be false.
- The mobile app is closed, and is not released.
Fonts
All three typefaces are used under the SIL Open Font Licence 1.1 and served from this domain rather than a CDN.
- Big Shoulders Display — headings
- Archivo — body text
- IBM Plex Mono — values, code and protocol output
Software
- esptool-js — powers the in-browserclone tool.
- Astro and React — this website.
- ArduinoJson and ESPAsyncWebServer — the firmware.