Mathegym is a multi-award-winning math learning platform designed by teachers for grammar school and secondary school. It provides tasks of varying degrees of difficulty on almost all topics in grades 5-13 that can be solved online. The program checks the results and provides numerous aids, including explanatory videos. Complex tasks can be solved step by step, with feedback after each individual step. For correct solutions you get "Checkos" credited, which improve the table position.
Costs: Usually free of charge for students as part of a school license; otherwise a single license (month or year) can be purchased to access all content.
Attention: Maths gym can also simply be used as a browser application. In contrast, the app does not contain any additional functions.