Free LeetCode Alternatives
The best free alternative to LeetCode is Khan Academy. If that doesn't suit you, our users have ranked more than 25 alternatives to LeetCode and many of them is free so hopefully you can find a suitable replacement. Other interesting free alternatives to LeetCode are Codecademy (Freemium), exercism (Free, Open Source), HackerRank (Free Personal) and Codewars (Freemium).
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- Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve. View 31 alternatives to Project Euler
- Free • Proprietary
Project Euler vs LeetCodeThere is a mathematical focus and has good examples of why some problems need optimized algorithms. You get exposed to a lot of cool math concepts and are challenged to write in efficient time and space complexity.