CTFlearn is free and will always remain free to use.

However, building and running CTFlearn takes up a large amount of time. If you like CTFlearn, have found it useful, and are able to do so, please support CTFlearn! PayPal


CTFlearn++ will offer the following benefits:

  • No advertisements
  • Since you are not logged in, no supporter badge will be displayed next to you username.
  • Any future benefits to CTFlearn supporters

Contributions go towards:

  • Time spent developing new features
  • Time spent maintaining CTFlearn
  • Infrastructure (hosting, bandwidth, etc)
  • Time spent creating new challenges and events

You can support CTFlearn via PayPal

Amounts under $3 barely reach CTFlearn after fees and therefore will not confer a badge.