v1.1.7 is live

Chrome / Edge extension for people who watch videos, streams, and online classes in another language. No uploads. Just hit Start and read along.

Works with YouTube, Netflix, Twitch, Zoom, and more.

How it works

1. Install Extension

Pin SonicCaption in your browser bar for quick access.

2. Open Any Tab

YouTube, Netflix, Zoom, Twitch, courses... anything with audio.

3. Hit Start

Pick your languages. SonicCaption listens and translates instantly.

Follow that Japanese stream

Bilingual subtitles for late-night streams, anime, and variety shows.

Stay present in meetings

Read what people say in real time during Zoom / Meet calls.

Don’t miss course details

Use dual subtitles to catch every formula, term, and example.

Practice without pausing

See original + translation together, so you can learn as you watch.

Why it’s different

Real-time, low-latency

Subtitles appear in ~0.5s, good enough for live streams.

Dual subtitles

See original and translation at the same time.

Universal compatibility

If the tab plays audio, SonicCaption can listen.

No manual uploads

No files, no exports. Everything happens in your browser.

Privacy-aware

Audio stays in tab; only text segments are processed.

Simple plans, minutes instead of jargon

Try it with free minutes. Upgrade only if you actually use it.

Free

Try the core features.

• 20 minutes / month
• Real-time captions on any site
• Bilingual subtitles (source + translation)
• Standard caption quality

Starter

/mo

Best for occasional learners.

• 8 hours / month
• Everything in Free
• Priority caption quality & latency
• Email support

Most Popular

Pro

/mo

For weekly classes and meetings.

• 20 hours / month
• Everything in Starter
• Priority support

Power

/mo

For heavy users and daily learning.

• 50 hours / month
• Everything in Pro
• Priority support

Ultra

/mo

For power users who need maximum hours.

• 120 hours / month
• Everything in Power
• Priority support

Need more?

Contact us for custom enterprise solutions

Cancel anytime via Stripe. No tricks.

Built by someone who actually needs this

Ethan Hu · Software Engineer

Hi, I’m Ethan Hu. I’m a software engineer at a large tech company and a serious language learner. I live and work in a country where the main language isn’t my native one, so a lot of my week is spent in meetings and online courses in that language. It’s exciting, but it can also be exhausting to keep up.

I built SonicCaption because I was constantly pausing videos, rewinding meetings, and reading transcripts after work just to understand what people were saying. I wanted something that quietly sits in my browser, gives me clear subtitles and translations in real time, and lets me stay present instead of fighting the language all the time. I use SonicCaption myself every day for both work and study. If something feels off, or you have ideas to make it better, you can email me directly at support@soniccaption.com — I read every message.