The main difference: output modality
StreamVox is a captions tool: it listens to audio and renders translated text on your screen as subtitles — a well-established approach, especially if you want a readable transcript alongside the original audio.
VoxisLive captures the incoming audio, translates it, and speaks the translation back through your speakers or headphones in a natural voice. No subtitle overlay, no second thing to watch. That suits situations where your eyes are occupied — gaming, video, live presentations — and accessibility scenarios where reading captions isn't practical.
A secondary difference is capture: VoxisLive uses Windows WASAPI directly, so no virtual audio cable or loopback driver is required. StreamVox requires a virtual audio device, which works once configured but adds install steps and can conflict with exclusive-mode devices, ASIO drivers or multi-output setups.
Which should you choose?
Choose VoxisLive if you want to hear translated content rather than read it; you want zero-friction setup with no virtual drivers; you want a genuinely free tier (the open-source BYOK build costs $0 with your own Gemini key); you translate meetings without a bot; or you play games and want translated dialogue without leaving the action.
Choose StreamVox if you specifically need on-screen captions, a caption history, or a transcript-style reading experience. (VoxisLive also offers an optional caption overlay and TXT/SRT/VTT transcript export, but its core output is the spoken voice.)
Both are legitimate Windows translation utilities. The decision comes down to whether you want to read the translation or hear it.