rCTF is an open-source capture-the-flag platform, serving thousands of teams with indestructible performance and a modern user experience. It is developed and maintained by the OtterSec team.
Installation
Spin up a Docker stack in a few minutes, or step through a manual VPS install.
Configuration
Every option in your config files and env vars, plus what each one actually does.
Providers
Configure captcha, emails, uploads, scoring, moderation, and analytics.
Administration
Run the event from the web. Add challenges, manage users, edit settings.
API reference
Typed JSON routes for auth, challenges, teams, leaderboard, and admin actions.
Theming
OKLCH color tokens with semantic naming, plus dark mode out of the box.