Matematikus 9 is an Android application created by Apabil for pupils who want to prepare thoroughly for secondary school mathematics entrance exams. The app is also suitable for anyone who wants to improve their math abilities. It contains a unique collection of 500 detailed tasks divided into arithmetic, algebraic expressions, fractions, percent, equations and inequalities, geometric problems, the ratio of direct and inverse, word problems, and conversions.

One of the app's significant advantages over other test collections is that each example contains a detailed process solution. This feature helps users quickly master mathematical principles and the right mindset. The app saves all your results, allowing you to track your progress. You can go back to any example of good practice and study solutions anytime. Matematikus 9 also includes sharp and practice tests, which are similar to tests present in the entrance exams. Both contain 20 examples randomly selected from the collection. The app is completely ad-free and does not require an internet connection.