Kanji Dojo vs LetterSchool

Kanji Dojo is an open-source app for learning Japanese character writing, meanings, readings, and related words. It covers hiragana, katakana, and more than 6,000 characters. Learners can organize study by JLPT level, school grade, or WaniKani level, including combinations of those paths. Flashcards and spaced repetition support practice, with vocabulary examples, and a searchable dictionary provides character and word lookups. After downloading the learning materials needed, users can continue studying offline. The learning content is free, while some extra features are paid to help cover backend and development expenses. The app is available on Android, iOS, Linux, macOS, web, and Windows. Its privacy policy describes aggregated usage information and crash diagnostics, and says information is not shared or sold to third parties for marketing. The project is community driven, so requested features may depend on an interested contributor. The linked GitHub repository was archived on August 27, 2026, and is read-only.

LetterSchool teaches handwriting, phonics, numbers and spelling through activities for young children. It is described as designed for ages three to eight, with a listed target age range of two to six. Letter practice moves through guided tapping, tracing and independent writing. The app gives visual and auditory feedback and corrects each line as a child draws it. Languages listed include English, Spanish, Portuguese, French, German, Dutch, Japanese, Swedish, Norwegian, Finnish, Danish and Arabic. English users can choose Handwriting Without Tears, Zaner-Bloser or D’Nealian handwriting styles. The free app costs nothing and includes five uppercase and lowercase letters, five shapes and three CVC flashcards covering nine words. Paid access is listed from $1.92/mo (annual), with a 7-day trial. LetterSchool is available on Android, iOS, macOS and Windows. The school offering is currently iOS-only as LetterSchool – Block Letters. The maker says the app has no ads or social media and does not seek to collect personally identifiable information directly from children under 13.