Why AI visibility in multilingual countries is double the work

A tax advisor in Brussels is searched by a Flemish client in Dutch and by a Walloon client in French. Asking the same question — "Which tax advisor in Brussels specializes in SMBs?" — once in Dutch and once in French in ChatGPT yields two different lists of companies. This isn't a coincidence, but how AI systems work in multilingual markets.

AI answers per language from its own sources

AI systems like ChatGPT, Perplexity and Google AI build their knowledge from crawled content — and content is language-bound. A French answer draws on French websites, directories and sources; a Dutch one on Dutch. A company can be presented perfectly in Dutch and be completely missing in French, simply because it provides no citable French signals.

Even within the same language, different AI platforms barely overlap: ChatGPT and Perplexity only cite 19% of the same domains (Frase.io, 2026). Across language boundaries this scatter grows even larger — a German optimization has practically no effect for an Italian or French query.

Who is affected

The problem affects every company whose home or target market speaks several languages — and in the heart of Europe there are surprisingly many:

• Belgium — Dutch (Flanders) and French (Wallonia/Brussels), plus German in the east
• Switzerland — German, French and Italian, depending on region and clientele
• South Tyrol and northern Italy — Italian and German
• Brussels and EU institutions — additionally English as a working language
• Border regions and exporters — the language of the target market, not just their own

Why that means double the work — not just a translation

It's not enough to run the website through a translator. AI visibility per language means: measuring separately how the four major AI engines present the company in that language, creating separate error and opportunity lists and setting language-specific signals — a French FAQ, Dutch schema descriptions, consistent company data in each language area. Each language is effectively its own optimization run.

That's exactly why Surfaced scales the price by languages: the first is included in the package price, each additional costs +50% of the base price — because the full analysis (17 test questions across four AI engines, each answer expert-validated) runs anew per language. With AI Visibility Monitoring (base €99/month): Belgium with Dutch + French €149/month, Switzerland with German + French + Italian €198/month.