CaptionGo - Live Dual Subtitles, AI Translate by RabbitPair

CaptionGo adds dual-language subtitles and AI-powered live captions to the videos you already watch, helping language learners and anyone watching foreign-language content follow every line.

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 captions for you.

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.

Great for
- Learning English (or any language) by watching videos
- Following online courses and lectures
- Understanding foreign-language movies, news, and livestreams
- Getting captions on videos that ship without subtitles

Works across the web, from streaming sites like YouTube, Netflix, and Bilibili to online course platforms and most embedded video players.

Install CaptionGo to add bilingual subtitles and live captions to any video.