JLPT Sentence Lab

Leo.Shayne

Contains adsIn-app purchases

About this app

Put the Japanese you learn into your own sentences.

JLPT Sentence Lab combines grammar by level, vocabulary study, contextual sentence writing, AI-assisted feedback and dynamic review plans. For learners aged 18 and over preparing for JLPT N1–N4 or building confidence in written Japanese.

DYNAMIC REVIEW PLANS
Use the principles of the Ebbinghaus forgetting curve to build a dynamic review plan. Adaptive spaced repetition adjusts future reviews using your learning history, recall ratings and practice performance. Find due material in today's tasks and balance new learning with revision.

GRAMMAR FROM N4 TO N1
Explore N1, N2, N3 and N4 grammar with Chinese and English explanations, sentence patterns and Japanese examples. Search and filter by learning status for structured study or focused practice on weaker points.

WRITE, GET FEEDBACK AND REVISE
Write original sentences using target grammar. Receive AI-assisted feedback on grammar use, sentence patterns, completeness, naturalness and vocabulary. Review explanations, corrections, additional examples and follow-up practice, then try expressing your ideas again.

PRACTICE IN CONTEXT
Work through expression tasks that progress from understanding to substitution, combination and use in a new context. Practice choosing language that fits the situation.

VOCABULARY PRACTICE WITH GRADUAL HINTS
Look up readings, meanings and reference levels. Organize unfamiliar words and practice lists, then use words in contextual sentences. Gradual hints and optional word-chunk ordering provide support when needed. Return to scheduled practice and detailed word histories.

DAILY PLANS THAT FIT YOUR GOALS
Set your target level, target date and available study time. Manage plans for different levels while balancing your main goal with foundational practice. Adjust, pause or resume plans and find learning and review tasks in one daily view.

YOUR OWN VOCABULARY AND EXPRESSION LIBRARY
Save vocabulary, correct sentences, revised expressions, additional examples and notes. Import personal learning materials in the supported JSON format, preview and deduplicate entries, then check them before adding them to your library.

TRACK PROGRESS AND STAY FOCUSED
Review grammar learning states, sentence scores, feedback and vocabulary practice history. Use the practice-page focus timer and break reminders to organize your study sessions.

CHINESE AND ENGLISH INTERFACES
Choose a Chinese or English interface while keeping Japanese learning content in Japanese. Continue studying on Android and the web with the same account and access your plans, materials and learning records.

Before you start:
• Learning and AI features require an internet connection and account sign-in.
• Free usage limits and membership access may apply. See the app for current availability.
• AI feedback is a learning aid and may contain errors. Learning and retention outcomes vary.
• JLPT Sentence Lab is an independent learning tool, is not affiliated with the organizers of the Japanese-Language Proficiency Test, and does not provide official exams or guarantee exam results.

Support: [e-mail]
Privacy: https://jlpt.meritledger.org/privacy
Account deletion requests: https://jlpt.meritledger.org/delete-account

What’s new

A new JLPT learning experience:
• Updated the app icon with a full yellow background.
• Study N1-N4 grammar and vocabulary, practice Japanese sentences, and get AI feedback.
• Follow dynamic review plans inspired by the Ebbinghaus forgetting curve, with intervals adjusted to your learning performance.
• Build skills through contextual practice, learning history, and focus sessions. Continue learning on Android and the web.