A CAT tool (Computer-Assisted Translation tool) is software that splits a document into segments and shows a linguist source and target side-by-side with translation memory and glossary matches.
Why CAT Tools Matter
CAT tools matter because they turn translation from a blank-page task into a guided, consistent process. Instead of retyping a document from scratch, a linguist sees each segment — usually a sentence — next to any prior translation memory matches, relevant glossary terms, and style guide notes, so terminology and phrasing stay consistent across a document and across every future project in the same language pair.
The term covers a range of software, from professional desktop tools like Trados and MemoQ, built for full-time localization teams managing complex workflows, to lighter, browser-based editors built for reviewing AI output rather than translating from zero. What they share is the segment-by-segment, source/target structure and the connection to translation memory: every confirmed segment is saved and can be reused the next time similar text appears.
CAT tools are not the same as machine translation. A CAT tool doesn’t generate translations on its own — it’s the workspace where a human (or an AI draft) gets reviewed, corrected, and confirmed segment-by-segment, with translation memory and glossary as reference at every step.
A Concrete Example
A marketing manager receives an AI-translated product page in German. Opening it in a CAT tool, they see English source text on the left and the German draft on the right, split into individual segments. One segment uses “Anmelden” for “Sign up,” but the glossary specifies “Registrieren” — the glossary hint flags the mismatch, the manager corrects it in that segment, and the fix is saved to translation memory so every later mention of “Sign up” in German content matches automatically.
How CAT Tools Work in Taia
Taia includes a built-in CAT editor, available on the Pro plan, designed for marketing and content teams rather than professional localization specialists — if you can use Google Docs, you can use it. It shows source and target side-by-side, applies glossary terms automatically, and saves every edit to translation memory in real time, so reviewing an AI draft also improves future AI translations. See the CAT editor product page for the full feature set, including task assignment for team review.