Built for professional interpreters and anyone in a two-language conversation: DuoVox shows both sides live, what each person says and its translation, side by side in 4 boxes. It captions anything your PC plays (Teams, Zoom, Meet, WhatsApp, YouTube) with nothing joining the call, or people in the room via your mic. Free runs offline in 30 languages, no account. Paid plans add cloud AI and up to 43 languages; Professional adds full medical and legal word lists, a glossary and Private Mode.