Kyronix started as a question: how much real flight controller can you put on a $4 microcontroller? The answer turned out to be "most of it." A single ESP32 runs a 500 Hz cascaded PID loop on one core while the other handles WiFi, telemetry and an independent safety supervisor.
There is no radio receiver and no flight-controller board. The phone is the transmitter — it joins the craft's own WiFi access point and streams control over a compact binary UDP protocol. Telemetry flows back the other way at 20 Hz so the app can draw a live horizon, battery and motor outputs.
Everything is open. The firmware, the Kotlin app, the wiring and the tuning notes are all public, so you can read exactly how it flies — and change it.
"Most of a flight controller, on a four-dollar chip."