Best Coding Challenge Sites in 2026
Updated
30 coding challenge sites ranked on what their makers publish — plans and prices, free tiers, platforms and the facts on their own pages.
30ranked
0free plans on this page
4 Oct 2026last checked
Coding challenge sites, ranked on how quickly a newcomer can get going. 0 of the 5 on this page can be tried for free.
- 26 Codewars
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 27 Exercism
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 28 Frontend Mentor
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 29 Project Euler
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
- 30 DMOJ
- Free to practise on: not on record
- Free trial: not on record
- Well documented: not on record
- Runs where you work: not on record
