DualLang — Language Immersion by Duallang

DualLang turns every webpage into a language lesson — without changing how you browse.

Once installed, DualLang automatically shows translations below headings, paragraphs, and list items on every page you visit. Your original text stays exactly where it is. The translation appears just below it in a clean, unobtrusive style. Both languages, side by side, on every page.

🔍 LIVE SEARCH MIRRORING
Search bar mirroring works on major search engines and AI chat platforms, showing a live translation as you type— before you even hit Enter. See what your words look like in another language as you think them.

🌐 WORKS EVERYWHERE
DualLang translates content on every website you visit — news sites, blogs, social media, search results, forums, shopping sites, and more. It handles modern web apps that use Shadow DOM components where other translation tools fail.

⚡ ZERO CONFIGURATION
Install it. Pick your language. Done. DualLang auto-detects your native language from your browser settings and starts translating immediately. No API keys, no accounts, no complicated setup.

Vocabulary Builder (NEW)
Click any word in a translation to save it. Drag across multiple words to save a phrase. Each saved word gets an instant reverse translation so you see both languages. Build a personal vocabulary list as you browse — no extra effort required.

Flashcard Study Mode (NEW)
Open the Vocabulary page and hit Study to review your saved words as flashcards. Click to reveal the answer, then advance to the next card. Reshuffle and study again as many times as you want. Your words, your pace.

Export & Track Progress
Export your vocabulary to CSV for use in other apps or spreadsheets. Track your word count and study streak from the vocabulary dashboard.

📚 30 LANGUAGES SUPPORTED
Spanish, French, German, Italian, Portuguese, Dutch, Polish, Russian, Japanese, Chinese, Korean, Arabic, Turkish, Swedish, Danish, Finnish, Greek, Czech, Romanian, Hungarian, Ukrainian, Indonesian, Vietnamese, Bulgarian, Croatian, Lithuanian, Latvian, Slovak, Slovenian, Estonian, and Norwegian.

✨ CLEAN, NON-INTRUSIVE DESIGN
Translations appear in a subtle italic style with a colored left border — easy to spot, impossible to confuse with the original text. DualLang uses Shadow DOM isolation so translations never break page layouts, even on complex sites.

🆓 COMPLETELY FREE
No subscription. No API key required. No account needed. No ads. Just install and start learning.

HOW IT WORKS
1. Install DualLang and pick the language you're learning
2. Browse the web normally — translations appear automatically
3. Click any translated word to save it to your vocabulary
4. Open the Vocabulary page to study your saved words with flashcards
5. Your native language is auto-detected from your browser settings.

The extension runs quietly in the background. Toggle it on or off with one click from the toolbar icon. Customize the translation color in settings.

FEATURES

• Translates headings, paragraphs, list items, and content blocks on every page
• Shadow DOM support for MSN, web components, and modern sites
• Search bar mirroring works on major search engines and AI chat platforms, showing a live translation as you type
• Click individual words or drag to select phrases to save
• Flashcard study mode with shuffle and repeat
• Auto-detects your native language from browser settings
• 30+ languages supported
• Customizable translation text color
• In-memory and persistent caching for fast performance
• Multiple translation API endpoints with automatic failover
• Lightweight — no account required, no data collected
• Works on Chrome, Edge, and Chromium-based browsers

PERFECT FOR
• Language learners who want passive daily exposure
• Travelers preparing for a trip
• Bilingual families browsing together
• Students studying a foreign language
• Anyone curious about how their everyday reading looks in another language

DualLang is not a replacement for dedicated language courses — it's the companion that makes every minute you spend online a learning opportunity.