Topcoder is described as 'provides members opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems' and is an website in the Development category. There are more than 10 alternatives to Topcoder, not only websites but also apps for a variety of platforms, including SaaS, Windows, Self-Hosted solutions and Mac. The best alternative is Codewars, which is free. Other great sites and apps similar to Topcoder are HackerRank (Free Personal), Edabit (Paid), LeetCode (Freemium) and CodeSignal (Paid).
When learning to code, most people get stuck on the "bridge" between memorizing syntax and understanding the logic that makes it all work. We believe the most effective way to learn a programming language is to break the process into three phases:
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.
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.
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.
At Programmr you can code, compile & run your programs directly in the browser. Supported platforms include C++, Java, PHP, C#, Flex, J2EE, Objective-C and many others. Programr is the fastest way to become a programming guru!