Numble - It's like Wordle for Math equations.
Mathquizily - Personalized math tests
Guriddo - Guriddo (グリッド, Japanese for grid) is a free and competitive number puzzle app with daily challenges.
BioBase - Measure and manage your stress
LogicLike - Improve logical thinking through engaging brain games
Afilm - An app to help you keep track of your analog shots