Browser Extensions & Plugins
Immersive bilingual web translation and YouTube dual subtitles powered by DeepSeek, Claude, and Gemini
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A Chrome extension that provides side-by-side bilingual web translation and YouTube dual subtitles using AI models, with zero layout breakage and local privacy
DualTrans is a browser extension for immersive bilingual reading and translation. It uses leading AI models including DeepSeek, Claude, and Gemini to translate web pages while preserving original formatting and layout. The extension displays translations side-by-side with source text rather than replacing it, maintaining code blocks, LaTeX formulas, and interactive elements intact.
Key features include YouTube dual subtitles with synchronized bilingual captions, instant selection lookup with a floating action ball, and six customizable translation display styles. Users can choose between a free plan with Google and Microsoft translation engines plus custom API key support, or a Pro plan with managed cloud AI models and 10 million tokens per month.
The extension prioritizes privacy with a local-first architecture where API keys and browsing data remain encrypted in browser storage and are never sent to remote servers. It supports all major Chromium-based browsers including Chrome, Edge, Brave, Arc, and Vivaldi.
Pricing model: Freemium
Free plan: $0 forever with built-in Google and Edge translation engines and custom API key support. Pro plan: $2.99 USD per month or $24.99 USD per year (Save 33% with annual billing), includes official Cloud AI models (DeepSeek V3, Claude 3.5, Gemini 1.5), 10,000,000 AI tokens per month, YouTube du
Chrome's default translation forcefully replaces the entire page with target text, frequently corrupting layouts, destroying code blocks, and preventing source verification. DualTrans employs intelligent bilingual alignment, presenting source and translation side-by-side powered by modern LLMs for natural, human-grade comprehension.
DualTrans's core functionality is completely free, including built-in Google and Microsoft translation engines. If you have API keys from OpenAI, DeepSeek, or SiliconFlow, you can input them to call LLMs directly for free. If you prefer not to manage API keys, the Pro subscription gives you instant access to top-tier managed AI models.
Never. DualTrans strictly adheres to a local-first privacy architecture. Your API keys and configuration preferences are encrypted in your local browser storage, and translation requests are dispatched directly from your browser to the respective API endpoint without intermediate proxies.
DualTrans supports all major Chromium-based browsers, including Google Chrome, Microsoft Edge, Brave, Arc, and Vivaldi.
Once the extension is installed, open any YouTube video with captions. A DualTrans subtitle toggle button will automatically appear on the video player controls. Click it to display synchronized bilingual subtitles.
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DualTrans has a free listing. The owner can unlock the full profile with a paid launch for $5:
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