001理解 · vocabulary terminal

Vocab study, but it's optimized

Tying neural pathways together for multilingual minds. Redefining language acquisition.

every language starts with vocab

One concept. One word. One room to process it. Any language.

解

rikai

operator

日本語 deck

248

In Queue

112

Reviewed

Don't-Know

1.2k

Mastered

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日本語

やくそく

約束

a promise; an appointment

彼との約束を守った。

I kept my promise with him.

✦ Smart Sentence✦ Smart Definition

reveal (space)

the method

Redefining language acquisition. Intelligent spaced repetition that forces connections.

In vocab study, the less isolated a word is when you learn it, the easier it is to remember. That's why rikai builds smart sentences from other words in your own deck, and why every word is defined in multiple languages at once — every rep wires the new word into what you already know.

The more you connect a new word — to other words you already know, and to real, concrete experiences and events — the more durably you remember it. That's why rikai builds smart sentences from your own deck words and defines each word across your languages: every review forges another connection, and deeper, more connected encoding is what survives.

The evidence

[1]Craik, F. I. M., & Tulving, E. (1975). Depth of processing and the retention of words in episodic memory. Journal of Experimental Psychology: General, 104(3), 268–294.↗[2]Craik, F. I. M., & Lockhart, R. S. (1972). Levels of processing: A framework for memory research. Journal of Verbal Learning and Verbal Behavior, 11(6), 671–684.↗

Simultaneous multilingual study

Each new word anchored in two languages you already know.

AI sentences from your deck

Fresh examples that reuse your own words, generated on the spot.

Instant decks + marketplace

CSV in seconds, or browse ready-made decks across languages.

Photos → CSV decks

Snap a page; get a studyable deck — no typing.

Optimized for neural connections

Every rep ties a new word to ones you already know — building a web, not a list.

coming soon

Polyglot mode

For multilinguals — review several languages at the same time. In the works.

Developed by Eric Torii, Business & Japanese Double Major @ CMU & 慶應大学.

founder's story

Built by an aspiring polyglot on his fourth language.

I'm Eric. I learned 10,000 vocab words with Anki in a single year — zero Japanese to JLPT N2 in 10 months, two hours a day. I mapped exactly what Anki was missing: one app built for serious daily learning, where everything lives together — from search to leveraging my Mandarin and multilingual knowledge to acquire a new language faster. rikai is that tool.

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理解