Real-time bilingual subtitles on any tab.

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February 16, 2026

SonicCaption

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Real-time bilingual subtitles on any tab.

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Overview

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SonicCaption is a browser extension that provides real-time, dual-language subtitles for any online video or audio content. It serves as a highly effective tool for language learners, non-native professionals, or anyone seeking to engage with content in another language.

SonicCaption operates across a wide range of platforms, including but not limited to YouTube, Netflix, Twitch, Zoom, and Google Meet. The tool listens to the audio in any opened tab and instantaneously produces subtitles in both the original language and the user's chosen translation.

It is designed to function seamlessly without requiring any manual uploads or additional processes. SonicCaption can translate live streams with minimal latency, contributing significantly to scenarios such as international meetings, online classes, or viewing foreign shows.

Users also have the luxury of seeing the original content and translations simultaneously, facilitating efficient language learning. In addition, SonicCaption is designed with privacy considerations; it doesnt move audio out of your browser, and only processes text segments.

The tool offers various subscription plans based on user needs, from free to ultra versions, ensuring scalability for all types of users, from casual learners to power users.

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Initial release

February 16, 2026

Ethan Hu

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Initial release of SonicCaption.

Author

Ethan Hu

@xtcodetech

I’m an indie full-stack developer building browser extensions that make multilingual communication effortless. I’m the maker of SonicCaption (real-time bilingual captions & translation for any website) — https://soniccaption.com — and DubTab (live voice translation and AI dubbing in your browser) — https://dubtab.com .

soniccaption.com

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Joined: May 2025

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Pros and Cons

Pros

Real-time bilingual subtitles

Works with multiple platforms

Doesn't require uploads

Processes audio in-browser

Compatibility with live streams

Original and translated subtitles display

Privacy-focused design

Browser-based functionality

No manual processes needed

Scalability with subscription plans

Direct support available

Proficient language learning tool

Non-native professional assistance

Facilitates accessibility by subtitling

Efficient language comprehension

Immediate translations

Low latency for live streams

Multi-lingual support

Prioritizes user privacy

Easy installation process

No additional software needed

Customizable language preferences

Simultaneous original and translated subtitles

User-friendly interface

Supports various video streaming platforms

View 20 more pros

Cons

Chrome/Edge specific

No offline capability

Subscription for extensive usage

Limited free usage

No mobile app

Q&A

What is SonicCaption?

SonicCaption is an AI-driven tool that offers real-time subtitles and translation for video content. It is browser-based and primarily built to help language learners and professionals who are not native speakers of the language of the content they're viewing or listening to.

How does SonicCaption work?

SonicCaption works by listening to any audio that plays in a selected tab and instantly translating it. Users first need to install the SonicCaption extension on their Chrome or Edge browser, after which they can select their language preferences to start using the service.

What platforms is SonicCaption compatible with?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption is a Chrome/Edge browser extension for desktop (Windows, macOS, Linux). It works on virtually any website where audio/video plays in your browser tab, including YouTube, Google Meet, Zoom (web), Microsoft Teams (web), Coursera/Udemy, Twitch, and TikTok Web.

How quickly does SonicCaption provide subtitles and translations?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption provides real-time, low latency subtitles; they appear in approximately 0.3 seconds, which is efficient enough for use with live streams.

Does SonicCaption require me to upload any files or data?

No, SonicCaption does not require users to upload any files or data. All processing happens directly in the browser.

What are SonicCaption's privacy protection measures?

SonicCaption takes user privacy seriously. It only processes text sections and the audio strictly remains within the chosen tab.

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What are the free features of SonicCaption?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption's free features include real-time captions on any site and bilingual subtitles (both the source language and its translation). Users have access to up to 20 free minutes

What subscription plans does SonicCaption offer?

Based on usage, SonicCaption offers several subscription plans apart from its free service. These include the Starter, Pro, Power, and Ultra plans, priced at $10, $20, $39, and $79 per month respectively. The features, such as priority support and caption quality & latency, increase with each subsequent plan tier.

Can I use SonicCaption for live streams?

Yes, SonicCaption is perfectly capable of supporting live-streams thanks to its real-time, low-latency subtitle generation feature.

Does SonicCaption support both original and translated subtitles simultaneously?

Yes, SonicCaption supports both original and translated subtitles simultaneously. This helps users better comprehend the content being viewed.

How can SonicCaption assist me in understanding foreign language streams?

SonicCaption listens to any audio that plays in the selected tab and translates it instantly. The real-time bilingual subtitles facilitate understanding of streams in foreign languages.

Does SonicCaption work with online courses?

Yes, SonicCaption can assist with online courses. Real-time bilingual subtitles help make sure users won't miss out on crucial details.

Can SonicCaption help me in international meetings?

Yes. SonicCaption's real-time bilingual subtitles can help you follow along during international meetings, making it easier to understand what everyone is saying.

How do I select my language preferences in SonicCaption?

Ethan Hu

🛠️ 1 tool

wrote:

You can select your language preferences in SonicCaption after installing the browser extension.

How can I install SonicCaption on my browser?

Ethan Hu

🛠️ 1 tool

wrote:

You can install SonicCaption from the Chrome Web Store (for Chrome) or the Microsoft Edge Add-ons store (for Edge). You can also visit our website and click the install button, which will take you to the correct store for your browser.

What kind of support does SonicCaption offer?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption offers support through our help form, email support, and our Discord community for questions, troubleshooting, and feature requests.

Does SonicCaption process audio or text sections?

SonicCaption processes only text sections and the audio strictly remains within the chosen tab. This protects users' privacy.

Can SonicCaption provide subtitles for any audio that plays in a selected tab?

Yes, SonicCaption listens to any audio that plays in a chosen tab. It then provides real-time translations for that audio.

Is SonicCaption viable for real-time, low latency subtitling?

Yes, SonicCaption is specifically designed for low latency, real-time subtitling. Its real-time bilingual subtitles appear in approximately half a second, making it suitable for live streams.

What is SonicCaption?

SonicCaption is an AI-driven, browser-based tool that provides real-time, dual-language subtitles for any online video or audio content. It is designed primarily to assist language learners and non-native professionals by offering real-time translations across multiple platforms like YouTube, Netflix, Twitch, Zoom, and more. SonicCaption operates as a browser extension compatible with Chrome and Edge, and translates audio instantly without requiring users to upload any files or data.

How does SonicCaption work?

SonicCaption works by listening to the audio that plays in the chosen tab and instantaneously translating it into the user's preferred language. The user installs the extension, selects their language preferences, and can then start real-time bilingual subtitling. In addition, it's designed to function seamlessly without requiring users to perform any manual uploads or additional processes.

Is SonicCaption free to use or are there different subscription plans?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption offers both free and paid subscription plans. The free plan provides the core features and allows for 20 minutes of usage. The paid plans vary based on usage - the Starter plan costs $10 per month for 8 hours of usage, the Pro plan is $20 a month for 20 hours, the Power plan is $39 a month for 50 hours, and the Ultra plan costs $79 for 120 hours per month. All paid plans offer priority support and enhanced caption quality and latency.

How does the SonicCaption browser extension help in language learning?

By providing real-time, dual-language subtitles for any online video or audio content, SonicCaption acts as a highly effective tool for language learning. Users can watch and follow along with content in their target language while also seeing translations in real time. Since it displays the original content and translations simultaneously, users can understand both the language they're learning and their native tongue, which effectively aids in language comprehension and acquisition.

Does SonicCaption support dual language subtitles?

Yes, SonicCaption supports dual language subtitles. This feature allows users to see both the original language and the translated subtitles simultaneously. It provides a better understanding of the content and facilitates efficient language learning and comprehension.

What are the advantages of using SonicCaption for international meetings or online classes?

SonicCaption provides several advantages for international meetings and online classes. It offers real-time, low-latency subtitles, which helps users follow the proceedings without any delay. Users can read what people say during meetings or classes, enhancing their understanding and helping them to stay abreast with the content being delivered. It also allows users to catch every detail, term or example being discussed, making it significantly beneficial for both professional collaboration and educational purposes.

How does SonicCaption ensure privacy?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption is built to minimize what we collect and keep. Audio from the tab is processed only to generate real-time captions/translation, and data is sent over encrypted connections. We don’t sell or share your content with third parties for advertising, and it’s not used to train public models.

Does SonicCaption require any manual uploads or file sharing?

No, SonicCaption does not require any manual uploads or file sharing. The system translates the audio in the chosen browser tab in real time, without the need for any file exports. Everything happens directly in your browser, thus eliminating the need for any external uploads.

What is the real-time latency of SonicCaption?

Ethan Hu

🛠️ 1 tool

wrote:

SonicCaption has a real-time latency of approximately 0.3 second, which is low enough to allow it to effectively subtitle even live streams.

How can SonicCaption translate content on Netflix or YouTube?

SonicCaption can translate content on Netflix, YouTube, or any other platform that plays audio. It works by listening to the audio in the selected tab and instantaneously translating it into your preferred language. This seamless operation offers a rich viewing experience, regardless of the platform being used.

How does SonicCaption handle audio and text processing?

SonicCaption processes audio and text entirely within the user's browser. It listens to the audio from the selected tab and translates it, providing dual language subtitles instantly. The audio is processed in the same tab without being moved or exported, ensuring privacy and security. Only the text segments resulting from the translation are processed further for display.

What is the unique feature of SonicCaption that distinguishes it from other similar tools?

One unique feature of SonicCaption that sets it apart from other similar tools is the provision of real-time bilingual subtitles. It displays both the original language and the translated subtitles simultaneously. This design allows users to understand the context better and aids in the learning process, particularly for language learners and non-native professionals.

Does SonicCaption offer support or accept user feedback?

Yes, SonicCaption does offer support and accepts user feedback. It has a direct support system through which users can share their concerns and suggestions for enhancements. Users can reach out directly via their mentioned email address for any queries or feedback.

Can I cancel my SonicCaption subscription anytime?

Yes, SonicCaption has mentioned that subscriptions can be cancelled any time via the payment processor, Stripe. There are no hidden conditions or tricks involved.

What are the system requirements for SonicCaption?

The website does not explicitly mention the specific system requirements for SonicCaption. However, since SonicCaption functions as a browser extension, it can be inferred that any system supporting Chrome or Edge browsers would be able to use SonicCaption efficiently.

How is SonicCaption beneficial for non-native professionals?

For non-native professionals, SonicCaption can be beneficial in various ways. It allows them to engage with international content and meetings without losing out on any information. With the tool's low-latency, real-time translations, they can follow along with discussions in a foreign language without any need for pauses or replays. This can significantly impact their productivity and ability to collaborate in a multilingual environment.

Is SonicCaption developed by a language learner or professional linguist?

SonicCaption was developed by Ethan Hu, a software engineer and a serious language learner. Ethan, living and working in a country where the main language isn’t his native one, created SonicCaption out of his personal need for a tool that would provide clear subtitles and translations in real time. The tool allowed him to understand content better without constantly pausing and rewinding videos or reading transcripts after work.

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