Hackboard is built on Karabiner Elements, created and maintained by Fumihiko Takayama (pqrs.org). Karabiner Elements is the foundation that makes Hackboard possible — years of careful, reliable engineering that the entire macOS keyboard community depends on.
Hackboard ships a modified fork called Hb-Karabiner-Elements. The core key-event engine, the DriverKit virtual HID driver, and the security architecture are inherited from upstream. Our modifications add custom functionality and a visual interface on top — the foundation is his work.
If you appreciate what Hackboard does, please consider supporting Karabiner Elements directly.