Edsger (formerly lilC) runs C, Python, JavaScript and Lua on your device, with a free on-device AI tutor and coding agent. No account needed.
Support. Questions, bugs or billing problems: email garrettiswoodside@gmail.com. You can also tap Settings → Email support in the app.
Subscriptions. Edsger Pro and Pro Plus renew monthly unless canceled at least 24 hours before the period ends. Cancel or change plans in Settings → your name → Subscriptions, or in the app under Settings → Membership → Manage subscription. Refunds are handled by Apple at reportaproblem.apple.com.
Your data. Projects stay on your device. The free AI models run on your device. Cloud AI (Dijkstra, or your own OpenAI or Claude key) only runs after you allow sharing. See the Privacy Policy.
C runs in PicoC, an interpreter, not GCC or Clang, so some standard library features are missing. Python, JavaScript and Lua run without package installs, network access or GUIs. AI can make mistakes; review its code.