Kotoba Vocab

When it's useful

• Torn between similar words

  Check the line between adoption / adaptation / acceptance from their etymology, on one screen.

• Cramming for an exam

  Notes on the spots people actually trip on — frequent collocations, confusable spellings.

• Somewhere with no signal

  The dictionary lives on your device, so it works the same on a plane or underground.

What it does

Pick one on the left to switch to that screen.

Learn it so it actually sticksExplains etymology, the line between near-synonyms, and the network of derived words — not just a translation to memorize.The details that matter on exam dayNotes on the spots people actually trip on — frequent collocations, confusable spellings.Keep going across devicesKeep your progress in step across iPhone, Android and Mac. No account and no email address. Sync is off by default — nothing is sent until you set a key.No ads, pay onceNo ads and no login. Pro is a one-time purchase, not a subscription — and it works on both stores with the same sync key.

Common friction, and how it's solved

• "I've memorized the translation, but still can't tell near-synonyms apart"

  →

  Explains the line between synonyms, how the etymology formed, and the network of derived words.

• "Making my own flashcards burns me out before I get anywhere"

  →

  Every entry ships with an explanation already written. No authoring step required.

• "A dictionary just lists definitions — it doesn't say why that's the translation"

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  Breaks down the etymology so you can read how the meaning came to be.

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