素数コレクター! by Hiroki Matsunaka






33+ similar apps compared and reviewed
Whether you want more options like 2進数ドリル or a completely different take on the same concept, our curated list of 33+ similar apps has you covered. Updated for 2026 with the latest ratings and comparisons.




















This app helps junior high school students learn 400 essential English vocabulary words. It features multiple-choice questions and pronunciation audio to improve listening skills. Earn gold medals by achieving perfect scores in each category.


A fun educational game where falling number blocks disappear when they add up to ten. Compete for high scores and challenge friends or family.




Master 450 essential English words for first-year high school students. This app features pronunciation for listening practice and covers 26 diverse word categories. Earn gold medals by achieving perfect scores in each section through quick, multiple-choice quizzes.


This app helps users learn the correct stroke order for writing katakana characters. It includes audio pronunciation for reading practice and allows users to save their practice sessions as a keepsake. It's designed for easy, individual practice.

