Saori Yabe

Japan Geography Master（日本地理マスター） is an educational app for elementary school students in Japan. Its main feature is a set of tappable interactive maps built with GeoJSON, helping children connect place names with real locations and geographic features. It also includes over 1,500 flashcards and 1,800 quizzes covering prefectures, mountains, rivers, plains, climate, agriculture, fisheries, and more. It supports school learning and junior high school entrance exam preparation. Japanese only.

Kotoba Tanken helps young children explore Japanese vocabulary through playful flashcards, audio, and simple quizzes. It supports English, Chinese, Vietnamese, and Korean as both app languages and secondary learning languages, making it useful for bilingual families, Japanese learners, and kids growing up with more than one language. Kids can learn everyday words across animals, food, vehicles, daily objects, seasons, Japanese culture, and onomatopoeia — in a gentle, visual, child-friendly way.

Goodnight Hamster is a cozy relaxation app for winding down at night. Choose your favorite hamster, enjoy gentle sounds like rain, ocean waves, white noise, and nature sounds, and relax with calming night sky scenes. The app can also reflect real weather, so the atmosphere feels a little different each night. There are no ads — just a quiet, simple space to relax, set a timer, and spend a peaceful moment with your hamster before bed.