SonicCaption is a browser extension designed to provide real-time bilingual subtitles for users watching videos, livestreams, or online courses. It was developed by software engineer Ethan Hu, arising from his own need for real-time translated subtitles while working and learning in a non-native language environment.
Purpose SonicCaption is mainly aimed at language learners and non-native professionals. It helps users see both the original text and translated subtitles at the same time without pausing the video or meeting, making it easier to keep up with the content. It is suitable for scenarios such as watching foreign-language videos, attending Zoom/Meet meetings, and studying online courses.
Main capabilities
- Real-time bilingual subtitles: provides subtitles with both the original text and translation displayed simultaneously on any tab.
- Low latency: subtitles appear in about 0.5 seconds, suitable for live scenarios.
- Broad compatibility: supports YouTube, Netflix, Twitch, Zoom, Meet, and others, and works as long as the tab has audio.
- No upload required: all processing is completed within the browser, audio remains in the tab, and only text segments are processed.
- Simple operation: after installing the extension, pin it to the browser bar, open any tab, choose a language, and click start.
How to use
- Install the Chrome or Edge extension and pin it to the browser bar.
- Open any tab with audio (such as YouTube, Netflix, Zoom, Twitch, or a course website).
- Choose the source language and target language, and SonicCaption will listen and translate in real time.
Use cases
- Watch Japanese livestreams, anime, or variety shows.
- Read what others are saying in real time during Zoom / Meet meetings.
- Use bilingual subtitles to capture formulas, terminology, and examples in courses.
- Learn while watching without pausing, seeing both the original text and translation at the same time.
Limitations
- Currently available only as a Chrome / Edge extension; support for other browsers is not mentioned.
- The free version provides only 20 minutes per month, and paid versions are tiered by hours; specific prices are not provided in the materials.
- Subtitle quality and latency may vary depending on network and audio quality; detailed technical specifications are not provided in the materials.
- Team/enterprise options provide a shared hour pool, centralized management, and dedicated support, but specific pricing and details are not yet provided.
SonicCaption offers a free plan (20 minutes/month) and multiple paid plans, including Starter (8 hours/month), Pro (20 hours/month), Power (50 hours/month), and Max (120 hours/month), as well as team/enterprise options. Users can choose a plan and upgrade within the extension.
The developer says he uses SonicCaption every day for work and study, and welcomes users to provide feedback via support@soniccaption.com.
