Apps with 'Coding challenges' feature

A fun social platform for hackers to solve interesting puzzles, build quick hacks, code game bots and collaborate to solve real-world challenges.

An exciting game of programming and Artificial Intelligence.

One programming challenge a day, the same one for everyone, solved in the browser in 11 languages with tests running in a sandbox.

Adaptive coding interview practice that recommends the right problem to solve next based on your skill level and weak topics.

Mutation testing practice platform for QA Engineers. Write pytest tests that catch hidden bugs in AI-generated code. 339 challenges across real-world domains, browser-based execution, instant feedback. Like LeetCode but for writing tests, not solving algorithms.

Datakaru is an affordable SQL and Python assessment platform for hiring data engineers with real-world take-home assignments.

kodwai is a platform where developers solve real coding challenges on their own machine with their own AI coding agent (Claude Code, Cursor, or Codex) and get scored on how well they direct the agent, across three axes: Direction, Outcome, and Lift.