Sites and apps similar to Calcora - Practice Math Problems include Khan Academy, which is free. Other options are Brilliant.org, LeetCode and Project Euler. In total there are four Code Learning Services like Calcora - Practice Math Problems for Android, iPhone and iPad.
Khan Academy is not-for-profit with the goal of changing education for the better by providing a free world-class education to anyone anywhere.
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Brilliant.org, also known as Brilliant, is a website and associated community that features problems and courses in mathematics, physics, quantitative finance, and computer science.
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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.
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Project Euler is a series of challenging mathematical/computer programming problems that will require more than just mathematical insights to solve.
