# Koboshi

> Koboshi is the memory layer for multilinguals and polyglots. Save the words you meet anywhere — ChatGPT, Duolingo, a screenshot — and FSRS spaced repetition brings them back until they stick, with real cross-language nuance.

Koboshi is a polyglot vocabulary app with AI-built flashcards, FSRS spaced-repetition scheduling, and a cross-language concept graph. It supports 18+ languages, runs as a PWA, and is free to use.

## Key pages

- [Home](https://koboshi.app/): The main landing page — what Koboshi is, how it works, and who it's for.
- [Polyglot mode](https://koboshi.app/polyglot): Built for multilingual learners who study more than one language at a time.
- [Heritage speakers](https://koboshi.app/heritage): For heritage speakers and receptive bilinguals who need vocabulary depth, not beginner lessons.
- [B1–B2 vocabulary](https://koboshi.app/b1-b2-vocabulary): For intermediate learners stuck at the B1–B2 plateau who know grammar but lack vocabulary fluency.
- [Import from ChatGPT](https://koboshi.app/chatgpt-import): How to pull the words you discussed with an AI tutor into Koboshi with one copy-paste prompt.
- [FAQ](https://koboshi.app/faq): Common questions about how Koboshi works, FSRS, language support, and importing.
- [About](https://koboshi.app/about): The story behind Koboshi.
- [Open the app](https://koboshi.app/learn): The vocabulary learning app itself (PWA, requires sign-in).

## Compare

- [Koboshi vs Anki](https://koboshi.app/vs-anki): A fair comparison — Anki's power vs Koboshi's frictionless capture.
- [Beside Duolingo](https://koboshi.app/vs-duolingo): Koboshi as the memory layer that keeps the words you meet outside Duolingo.

## Languages

Koboshi supports 18 languages including Spanish, Japanese, French, Portuguese, Italian, German, Korean, Chinese, Urdu, Hindi, Russian, Norwegian Bokmål, Turkish, Vietnamese, Filipino, Bengali, Dutch, and English.

- [Spanish vocabulary](https://koboshi.app/languages/spanish)
- [Japanese vocabulary](https://koboshi.app/languages/japanese)
- [French vocabulary](https://koboshi.app/languages/french)

## Blog

- [Why you understand Spanish but can't speak it](https://koboshi.app/blog/understand-spanish-cant-speak): Recognizing a word and producing it are two different skills. Here is why the gap shows up the moment you try to speak, and how to close it.
- [AI can explain words. Your brain still has to own them.](https://koboshi.app/blog/ai-explains-words): A good explanation is not the same as a memory. What still has to happen after the chat window closes.
- [Heritage speakers don't need beginner lessons. They need vocabulary depth.](https://koboshi.app/blog/heritage-vocabulary-depth): Fluent speech, missing words in one register. The fix is depth and precision, not basics.
- [How polyglots should organize vocabulary across languages](https://koboshi.app/blog/organize-vocabulary-across-languages): Separate lists, or one connected map? How to hold several languages without the mess.
- [Import your words from Anki, ChatGPT, or a CSV in minutes](https://koboshi.app/blog/import-your-words): A step-by-step walkthrough for bringing your existing vocabulary into Koboshi without losing anything.