DeriveIt has ~100 questions and ~40 lessons. It's up to you to decide how much practice you need, but users typically aren't limited by "not enough" practice problems.

Not sure if it's worth mentioning, but we made sure to cover all the ideas you learn from the Blind75 and NeetCode150. It's not like you're missing out - we're just:

- organized better

- higher quality solutions

(==> more efficient, hence not thousands of problems)