Vaivox is an AI-powered video dubbing service that translates and dubs YouTube videos into 39 languages using natural-sounding AI voices synced to the original footage. Users paste a YouTube link, select an output language, and receive a dubbed audio track or video within minutes. The service supports videos up to 2 hours and 30 minutes long, covering full lectures, podcasts, and conferences. Plans range from a free tier with 30 minutes per month to a Pro tier offering 500 minutes, priority processing, and per-speaker voice differentiation.