Kattis Alternatives

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

LeetCode is a platform for learning and improving coding skills with the goal of being fully prepared for programming interviews. Choose problems to solve from categories such as System Design, Algorithms and Database, join code contests and engage in mock interviews.

Achieve code mastery through challenge.

Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.

Online game for Python and JavaScript coders to improve skills.

Learn to code JavaScript by playing game. This game claims to be the world’s first MMO strategy sandbox game for programmers.

Topcoder provides members opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems.

Explore and attempt front-end coding challenges.

HackerEarth is the most comprehensive developer assessment software that helps companies to accurately measure the skills of developers during the recruiting process.

Learn and Practice on almost all coding interview questions asked historically and get referred to the best tech companies.

Coderbyte is a place built for anyone to practice and perfect their programming skills. Challenges are added almost every day so you can work on applying your algorithmic thought process on any problem you want at anytime.

CodeSignal is the leading provider of assessments for technical hires. As the creator of the Predictive Coding Score, a measure of a candidates coding skills, CodeSignal provides HR teams with Certified Assessments, Custom Tests, and Live Interviews.