KryonOS, developed by Haris, is a JavaScript-based operating system for ESP32. It offers a simple graphical interface, a graphics library, a JavaScript runtime, SD card file system access, and a hardware API; it runs on various ESP32 boards with displays, including the Cheap Yellow Display. It also has an app store for downloadable software.
Why it matters
This project brings together the hardware components, graphical interface, file access, and software distribution for applications developed on ESP32 under one roof. In this respect, it allows developers working with boards featuring displays in particular to use the common environment offered by KryonOS instead of combining separate tools for different needs. The app store shows that the system is not merely software installed on a single device, but also includes a software layer accessible to users. However, which applications are available in the store, the level of compatibility among supported boards, and the usage scenarios in which the JavaScript-based structure is sufficient have not yet been answered.
Background
ESP32 is not a new name in the FikirPilot archive: we have published 6 news articles mentioning it in the last 90 days; the latest is dated September 23, 2026.