For heritage speakers
You already speak it.
Now own the words.
You can hold a conversation. But when the topic gets serious, the precise word never comes, and you switch to English. That is not a fluency problem. It is a vocabulary gap, and Koboshi is built to close it.
This happens everywhere
A predictable gap with a clear fix.
The hard part is already done. Your grammar is strong and your accent is natural. What is missing is narrow and fixable: the formal words. You grew up between two languages, and that vocabulary only ever grew in the school one. The research has a name for it: a receptive bilingual understands far more than they can produce.
- 🇮🇳South Asian familiesSchool in English; Urdu, Hindi, Punjabi, or Bengali stays spoken-only.also🇵🇰 🇧🇩
- 🇲🇽Hispanic families in the USFluent Spanish at home, life in English everywhere else.also🇵🇷 🇨🇺 🇸🇻
- 🇯🇵Kikokushijo in JapanNatural spoken Japanese, but business katakana like コンセンサス feels foreign.
- 🇨🇳East Asian heritage speakersChinese, Korean, and Vietnamese across the US, Canada, and Australia.also🇰🇷 🇻🇳
- 🇹🇷Diaspora families in EuropeTurkish in Germany, North African in France, Russian-speaking in Germany.also🇲🇦 🇷🇺
- 🇵🇭Filipino families abroadTagalog at home, everything official in English.
The words are already in your head. You just need a way to reach them.
What Koboshi does for you
Built for the words you are missing, not the ones you have.
Search by meaning
Type the idea. See the casual, neutral, and formal word for it. Save the one to grow into.
Lean on your other languages
See the same idea in English or any language you know. The meaning clicks faster.
Review at your level
Words you know stay out of your way. Half-known words return right before you forget.
Save words from real life
An article, a relative, a drama, a poem. Save it the moment you meet it.
Who this page is for
If you grew up between two languages, this is for you.
Heritage speakers of Urdu, Hindi, Punjabi, Spanish, Japanese, Korean, Chinese, and more. Anyone fluent in conversation who still runs out of words when it matters.
Questions
The things heritage speakers ask first.
I can already speak the language. Is this still useful?
Yes. Koboshi is built for exactly your case: depth and precision, not basics.
Will it make me study beginner words?
No. It measures against your own level. Words you know stay out of your reviews.
I understand everything but freeze when I speak. Is that normal?
Very normal. It even has a name: receptive bilingual. The fix is making your known words faster to recall, and adding the precise ones you are missing. That is what the review system trains.
Which languages does it support?
Spanish, French, German, Italian, Portuguese, Japanese, Mandarin, Korean, Hindi, Arabic, Urdu, and Russian today, with more added steadily. If your language pair is here, you are ready.
Where next
Living between two languages?
Heritage speakers usually live between two languages anyway. Sometimes an idea is clearer in one, sometimes in the other. Koboshi is built around that.
The words are closer than they feel.
Start free. Add a few words at a time. Watch the precise ones become yours.
Free tier to start.