Compare software

ExercismLeetCode
Free

Free to use.

 Freemium

Many problems are free; a paid Premium subscription is offered.

Web Web
  • Exercises in dozens of programming languages
  • Optional feedback from mentors
  • Large set of algorithm and data structure problems
  • Solutions are written and run in the browser
  • Mentor availability can vary by language
  • Focused on practice exercises rather than full courses
  • Focused on puzzle-style problems rather than building real projects
  • Requires an internet connection
Web application Web application
Closed source Closed source
License not stated License not stated
Not stated if an account is needed Not stated if an account is needed
Not stated if it works offline Needs internet

Checked September 23, 2026

Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.