CaptionGo – Bilingual Subtitles & AI Live Captions for Any Video

Add dual subtitles & AI live captions to any web video with speech recognition. 30+ translation engines. Mobile & fullscreen.

What can CaptionGo do? CaptionGo is a bilingual subtitle and AI live caption extension for Chrome, Edge, Firefox, and mobile browsers. It adds dual subtitles (original + translation) and real-time AI captions to any web video — streaming sites, online courses, live streams, video calls, and more. Works on mobile and in fullscreen. Designed for language learners, students, and anyone watching foreign-language content. Unlike tools that only translate an existing subtitle track, CaptionGo shows the original subtitle and its translation at the same time — and when a video has no captions at all, it transcribes the speech into real-time live captions using AI speech recognition (ASR). Core features are free forever, with an optional PRO upgrade. Free - Bilingual subtitles (Basic): turn on a site's captions and CaptionGo appends a translation line in place — ideal for learning a language by watching videos or learning English with TV shows and movies. - Free translation engines: a built-in on-device translator plus Google and Microsoft. - Automatic captions: turns on a site's own closed captions (CC) the moment playback starts, with per-site rules. - Live captions (speech-to-text): a free daily allowance transcribes audio for videos with no subtitles, using AI speech recognition (ASR). PRO - Advanced bilingual subtitles: read the original subtitle data for preloaded, no-wait, full-sentence translation on a dedicated overlay. - Full subtitle customization: font, size, color, background, outline, and on-screen position. - AI subtitle translation: connect your own AI provider such as OpenAI, Gemini, and DeepSeek for natural, context-aware results. - More live captions (ASR): extra usage and the option to use your own speech-to-text key. - Cross-device sync: end-to-end-encrypted cloud sync — set everything up on your computer, then just install and sign in on your phone. What sites are supported? Works across the web — video streaming sites, online course platforms, live streams, web meetings, and any site with an HTML5 video player. Also works on mobile browsers (Android Firefox, Android Edge) and in fullscreen mode. Who is CaptionGo for? - Language learners — learn English (or any language) by watching videos with bilingual subtitles and AI translation - Students — auto-generated live captions for online courses, lectures, and educational videos - Live stream & meeting viewers — real-time AI captions for live streams, web meetings, and any live content without subtitles - Foreign content viewers — dual subtitles for movies, anime, K-dramas, news, and livestreams in any language - Subtitle-less content — AI speech recognition generates real-time captions for videos without subtitles Install CaptionGo to add bilingual dual subtitles and AI live captions to any video.