Wikids - An encyclopedia that talks to your kids
Numble - It's like Wordle for Math equations.
Numito - Word and number puzzles game, similar to Countdown GameShow
Guriddo - Guriddo (グリッド, Japanese for grid) is a free and competitive number puzzle app with daily challenges.
Cotrio - The most beautiful way to move your brain and imagination
BioBase - Measure and manage your stress