Learn Japanese — where understanding folds into fluency
Personalized · Connected · Long-term mastery
What you can do today — and what's coming
Kumi isn't a complete lesson product yet. If you landed here wondering where the curriculum is, start with the dictionary and follow along as we're shipping the rest in phases!
Dictionary & Discovery
Browse kana, radicals, kanji, and vocabulary concepts, follow connections, and save what you study. This is the richest part of Kumi today.
Open dictionary →Lessons & Mastery
Dynamic lessons, deeper content coverage, and the mastery experience inside the app are still under development.
Join the discord to follow along.
Mobile & Offline
Native apps, offline study, and polish across platforms so your progress goes with you everywhere.
Most apps follow JLPT because it's easy, not because it's best
JLPT levels are test benchmarks, not learning frameworks. They tell you where to aim, but they don't tell you what to study next. Most apps use JLPT as their curriculum backbone because it's the easiest thing to organize around, not because it's the best way to learn.
The Kumi Mastery Tiers (KMT) fix this. Kumi's mastery system tracks your actual understanding across kanji, vocabulary, grammar, and reading, and uses that to build a learning path that's specific to you. The Learning Priority Engine (LPE) personalizes what you see next based on what you've mastered, not a fixed sequence everyone follows. You still cover everything JLPT tests for. But the order and timing are driven by your real progress.
Learn Japanese the way it's actually used
Learning that respects your time and intelligence.
Your Mastery, Measured
The KMT tracks what you actually know across kanji, vocabulary, grammar, and reading, not what chapter you're on.
Start Where You Are
The LPE builds your path from your current knowledge, not a preset level. No two learners have the same journey.
Everything Connected
Progress in one skill unlocks progress in others. Kanji, vocab, grammar, and reading work together in one system.
Beyond JLPT
Kumi covers all JLPT content but doesn't use test levels as a curriculum. Order and timing are driven by your real progress.
Learned in Context
Words and grammar are taught through real usage, not isolated flashcards.
Your Interests, Your Way
Interest tags and communication style let you personalize. Tell Kumi what you care about and how you want to be spoken to.
One System, Not Five
Kanji, vocab, grammar, dictionary, and review in one place. One subscription replaces the patchwork of tools.
No Wasted Time
No busywork, no fake streaks, no filler. Every interaction has a purpose.
Adapts as You Learn
The LPE adjusts in real time. Strong in one area, weaker in another? It adapts accordingly.
In our dictionary catalogue we boast...
Web. Mobile. Offline. Discord. Dictionary.
Everything under one roof: learn anywhere, sync when you're back online.