Replying and searching are two different things
When people ask whether Vex "works in Hungarian", they are usually asking two questions at once. Replying in the visitor's language happens by itself. Searching your own content is a separate mechanism: your brand can hold content in several languages and keep full accuracy in all of them at the same time.
Replying: automatic, nothing to configure
Vex picks up the language of the visitor's message and answers in it — over a hundred languages, with no setting to switch on. If someone starts in English and carries on in French, Vex follows them.
Searching: up to three languages at once
Finding the right passage in your content has two halves: a meaning-based search, which does not care what language anything is in, and a keyword search, which very much does — it needs to know the language to handle word endings and stems correctly.
That keyword half runs once for every language your brand's sources are written in, up to three, each source searched in its own. A brand holding an English knowledge base and a Hungarian one keeps full accuracy in both, on the same question.
Where each source's language is set — and what it does
Open Brand → Knowledge. Every knowledge base and documentation set has its own Language, changed inline on its row. The on-screen note says exactly what it is for: "The language this is written in. It decides how your AI searches the text — it does not translate anything."
The brand's own Language, at Brand settings → General, does two things: it is the fallback for sources that have no language of their own — uploaded files, pasted text and question-and-answer entries — and it always takes the first of the three keyword-search slots, whether or not anything depends on it. So if your sources span more than three languages, only the first three are searched by keyword.
Conversation starters
The buttons a visitor sees before writing anything live at Brand → Vex → Starters. You write them in your own language, and each starter's Translations action holds its other languages; a visitor with no translation reads your wording. See Show your widget in your visitors' language.
You do not have to write them yourself. AI setup can produce a set for you, in the language it detected from your website — but only for an agent that has none at all, so it never replaces starters you wrote or deleted on purpose.
Always answering in one language (advanced)
If you want every reply in one language regardless of what the visitor writes — a Spanish-market site, say — put a rule in Answer instructions, on Brand → Vex → Personality → Answers:
Always reply in Spanish, regardless of the language the visitor writes in.Those instructions belong to that one AI agent, so a second brand keeps its own.
On a phone call
Calls work the same way, with one extra step. If the caller's language is not the language your material is written in, the search query is translated before the search runs, so the keyword half still matches. For a brand with no chat AI, the brand's own Language is used as the reference for that translation.
The chat widget's own interface language
The widget's own buttons and labels speak 38 languages and follow each visitor's pick; your brand's language is where they start. See Show your widget in your visitors' language.
Next step
See how the same brand knowledge reaches every channel: Chat, inbox and phone all answer from the same brand knowledge.