We’re Mariia and Vitalii — co-founders of Transept and the entire team. We met at Litero AI, an earlier AI writing startup, where Mariia ran product and product marketing and Vitalii led AI engineering. We left to build Transept full-time in September 2025. — Vitalii: I wrote 120,000 words of satirical romance fantasy — mages drowning in debt, a multiverse economy that makes Wall Street look ethical, and a love story tangled up in all of it. — Mariia: I write semi-fictional stories about real people, built around how it felt. Most of the people I wrote about were foreigners. We met in English, spoke in English, lived those moments in English. So I wrote them that way too. But I sometimes wonder what version of them I missed by not writing them in their language. — Vitalii: The same flatness hit me from the other side. Every tool I tried preserved the words but killed the voice — tone, rhythm, wit, emotional texture. Nothing held. It all came back flatter than it went in. — Both of us: So we did what we know how to do. We read the machine-translation papers. We benchmarked Claude, GPT, Gemini, and a handful of open models on the same 50-page chapter — judging accuracy, tone, and whether the satire still landed. None of them held all three; each failed in a different way. So we built the tool we wished had existed when we started.

Transept AI

AI translation with memory for books and long documents

AI translation with memory for books and long documents