Koboshi
Koboshi mascot

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.

One idea, three registers“beautiful” in Urdu
خوبصورتkhoobsuratA2Everyday
beautiful · خوبصورت گھر “a beautiful house”
Synonymspyaara · sundarRetained
حسينhaseenB2Literary
beautiful, lovely · حسين منظر “a lovely view”
Synonymsjameel · ra’naWeak
دلکشdilkashC1Poetic
beautiful, captivating · دلکش آواز “a captivating voice”
Synonymsjaazib · dilrubaNew
Koboshi
خوبصورتEveryday
khoobsurat · A2
beautiful. The word you already use
حسينLiterary
haseen · B2
beautiful, lovely. A touch more graceful
دلکشPoetic
dilkash · C1
beautiful, captivating. One to grow into
3 registers found

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.

In development

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.

🇵🇰 Urdu🇮🇳 Hindi🇪🇸 Spanish🇯🇵 Japanese🇰🇷 Korean🇨🇳 Mandarin

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.