Spoj is described as 'Sphere Online Judge created for the coders' community to train, to learn and to make progress. With thousands of programming problems and an international group of users Spoj is one of the best programmers' communities and online judges in the world' and is an app in the Education & Reference category. There are more than 10 alternatives to Spoj for a variety of platforms, including Online / Web-based, SaaS, Self-Hosted solutions, Mac and Windows. The best alternative is HackerRank. It's not free, so if you're looking for a free alternative, you could try Codewars or Project Euler. Other great apps like Spoj are CodinGame (Free), LeetCode (Freemium), Coderbyte (Freemium) and CodeSignal (Paid).
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.
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.
Develop your coding skills and practice them by competing with hundreds of players worldwide. Code your own bots in your preferred language and join the various competitions that we offer. Learn, win prizes, but most importantly, have fun coding!