DeepL

Cologne-based DeepL is one of Europe's best-known AI companies, famous for neural machine translation that many users find more natural than larger rivals'.

Beyond translation across dozens of languages, it has expanded into AI writing assistance for businesses. It serves hundreds of thousands of organizations worldwide and reached a roughly $2B valuation as a privately held unicorn.

Founded as Linguee and relaunched as DeepL in 2017, it remains a rare European consumer-and-enterprise AI success at global scale.