KoboshiBuild your language knowledge base on Koboshi.
Learn anywhere.
Remember here.
Save the words you meet anywhere: from ChatGPT to Duolingo to a screenshot. Built-in exercises train you until they stick.
Free. No card required.
A pointed hint aimed sideways, never said straight out.
- JA ほのめかし honomekashi a hint dropped without saying the thing
- UR اشارہ کنایہ ishāra kināya a veiled hint or allusion
- FR sous-entendu something implied, left unsaid
Where words go to disappear
Your words are everywhere. Your memory needs one home.
Finding a word is easy. Remembering it is the hard part.
- 💬 ChatGPT threadsexplained once, then buried 200 messages deep.
- 📝 Phone notesa list you wrote down and never reopened.
- 🖼️ Screenshotshundreds of them, not one of them searchable.
- 🗂️ Flashcardsgreat, if you ever find the time to build them.
- 📱 Other appsthey only remember what happens inside their own walls.
How it works
Catch a word once. Make it stick.
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01
📥 Capture
From text, ChatGPT, a Duolingo story, a screenshot, or an old CSV.
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02
✨ Understand
The card is made for you: meaning, example, nuance.
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03
🔁 Review
Hard words come back often, easy ones rarely, timed to just before you would forget.
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04
✅ Retain
See what is due, what is weak, and what has gone stable.
Saving from an AI chat
Use Koboshi from inside ChatGPT.
Say save insinuación to Koboshi while you are chatting with ChatGPT or working in Claude Code, and the word is in your vocabulary with its meaning and an example. See how to set it up.
How the memory works
Your language knowledge base, for every language, growing as you do.
Each review lands just before a word would fade and lifts it higher than before, so the gaps grow: a day, then three, then a week, then a month.
Polyglot mode
Strengthen every language you know, while you learn the next one.
Look a word up once and see it across every language you know. All of them live in one language knowledge base, so a word saved in one strengthens what you hold in the others.
Robbed of strength or ability; unable to act or function as normal.
- JA 行動不能 kōdō funō unable to act or function
- HI असमर्थ asamarth unable, incapable
- PT incapacitado incapacitated, unable
Pick your language
Koboshi supports 18 languages.
Each with script-aware display and pronunciation help.
Pricing
Free while we are in beta.
No card, no plan to choose. There will always be a free plan, and we will never start charging you without asking first.
Questions
The things people ask.
Is this a language course?
No. Koboshi is a vocabulary memory app you use beside your other tools.
Is it a Duolingo replacement?
No. Use it beside Duolingo. Duolingo builds the habit, Koboshi keeps the words and brings them back until they stick.
How is it different from Anki?
The cards are made for you, it is multilingual by default, and there is no deck-building setup.
Can I save words from ChatGPT?
Yes. One prompt turns the words in your ChatGPT thread into a CSV, and you upload that file.
Can I use it for several languages at once?
Yes. Look a word up once and see it across every language you know.
Is it good for B1/B2 learners?
Yes. It is built for the intermediate vocabulary wall and the recall speed that speaking needs.
How much does it cost?
Free while in beta, no card required. There will always be a free plan, and we will never start charging you without asking first.
Yours to keep
Your words are always yours.
Already have a list? Import it from Anki, a spreadsheet, or a plain text file inside the app, and export everything whenever you like.