Kujira Sensei

Kujira Sensei is built on one idea: studying Japanese should not require an internet connection, an account, or a subscription.

Everything runs locally. Open it on a train, on a plane, or in a classroom with no signal, and it behaves exactly the same as it does at home.

What it does

• Kana and kanji practice with immediate feedback
• Vocabulary lookup that works entirely offline
• No account, no sync, no telemetry