Obo | One By One
Master Japanese, One by One.
About
Master Japanese with a personal language learning companion. It uses smart spaced repetition and AI to help you learn vocabulary, grammar, and kanji efficiently. Offers flexible study options for beginners, travelers, and JLPT students.
What's New in Obo | One By One
1.6.8
July 7, 2026
Look up Japanese words anywhere. • Share Japanese text from any app to Obo and instantly look up words (Yomitan-style), powered by an offline JMdict dictionary. • Indonesian meanings — see definitions in Bahasa Indonesia, not just English. • Save with AI — tap to add a word to any deck and Obo's AI builds a complete flashcard: reading, meaning, and a natural example sentence (1 coin). Plus stability and performance improvements.
MoreIn-App Purchases
$3.99
Premium N5 Deck
Master essential N5 vocabulary with curated cards.
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FAQ
What is Obo's learning methodology?
Obo utilizes Smart Spaced Repetition (FSRS v5), a scientifically-proven algorithm, to optimize learning. Cards appear for review precisely when you need them, ensuring efficient memorization and retention of Japanese vocabulary, grammar, and kanji.
How does Obo help with JLPT preparation?
Obo offers ready-made template decks specifically designed for JLPT levels N5 through N1. These decks cover thousands of essential words and grammar points, providing a structured path for students aiming to pass the Japanese Language Proficiency Test.
Can I import my existing study materials into Obo?
Yes, Obo allows you to import your Anki decks, making it easy to transition your existing study materials. You can also create custom decks for any topic, offering great flexibility for personalized learning.
Does Obo offer offline study capabilities?
Absolutely. Obo is designed with an offline-first approach, allowing you to study Japanese anytime, anywhere without an internet connection. This makes it ideal for learning on the go.
What are the premium features in Obo?
Premium features in Obo include an expanded AI Smart Add quota, access to premium decks curated by experts, and priority support. These features aim to unlock unlimited potential for serious learners.
How often is Obo updated?
Obo receives regular updates, ensuring new features are consistently added and the app remains reliable. The latest version, 1.6.7, was last updated on June 22, 2026.
Is Obo suitable for absolute beginners?
Yes, Obo is perfect for beginners, featuring a step-by-step Hiragana & Katakana guide with interactive practice and immediate feedback. The beginner-friendly onboarding process ensures a smooth start to your Japanese learning journey.
Does Obo have ads?
No, Obo is ad-free, meaning no advertisements will interrupt your learning sessions. This provides a clean, distraction-free interface designed for daily study habits.