Duet Reader

DuetReader - read, listen & translate 2 languages side-by-side
Transform how you learn languages with DuetReader, the ultimate reading companion for immersing yourself in authentic foreign language content with complete control over your learning journey.
Read Anything, In 23+ Language
Break free from pre-packaged lessons. Import articles from websites, paste text directly, or upload PDF documents and EPUB e-books. Whether reading Spanish news, Japanese novels, Korean web novels, or French literature, DuetReader empowers you to learn from content that genuinely interests you.
Revolutionary Sentence-by-Sentence Translation
Experience precise sentence-by-sentence translations with synchronized highlighting. Watch each sentence illuminate in both source and translated text, making it effortless to understand exactly what each phrase means. Navigate using intuitive swipe gestures or our smart sentence slider while maintaining perfect context.
Multiple Translation Options:
Offline Translation: On-device ML Kit models work without internet—perfect for travel or commuting
Online Free Translation: Google Translate's powerful API at no cost
Premium Cloud Translation: Connect your Google Cloud API key for enhanced accuracy
All translations are cached for offline access to your favorite content.
Listen and Learn with Dual Audio
DuetReader's text-to-speech system brings content to life with dual audio playback. Hear both source language and translation with independent speed controls. Perfect pronunciation through native-like speech, then reinforce understanding with translations. Autoplay mode creates an immersive, hands-free experience perfect for commuting or exercising.
Choose system-installed voices for offline learning or connect to Google Cloud Text-to-Speech for premium, natural-sounding narration.
AI-Powered Grammar Analysis
Bring your Google Cloud API key to unlock deeper understanding with AI sentence analysis. Get detailed grammatical breakdowns explaining sentence structure, parts of speech, verb conjugations, and linguistic patterns. Like having a personal language tutor available 24/7.
Privacy-First, Offline-First Philosophy
Your data belongs to you. DuetReader delivers privacy and security:
All reading history and translations stored locally on your device
No analytics, tracking, or data collection
No advertisements
Cloud API keys encrypted and stored only on your device
Works completely offline with on-device translation and TTS
Beautiful, Customizable Interface
Enjoy elegant light and dark themes adapting to system preferences, adjustable font sizes, smooth animations, intuitive gestures, and split-pane layouts on larger screens.
Build Your Personal Language Library
Track your journey with comprehensive history management. Review articles, revisit passages, watch progress grow. Long-press to preview content, swipe to organize.
Generous Free Tier, Affordable Premium
Start with 3 free document imports daily—perfect for exploring the app. Unlock lifetime premium for unlimited imports, translations, and bilingual audio playback. No subscriptions or recurring fees—one purchase for lifetime access.
Supported Languages (23+)
European: English (US/UK), Spanish, French, German, Italian, Portuguese (Brazilian), Dutch, Polish, Russian
East Asian: Chinese (Simplified & Traditional & Cantonese), Japanese, Korean
South Asian: Hindi, Bengali, Urdu
Middle Eastern: Arabic, Turkish
Southeast Asian: Indonesian, Vietnamese, Thai
Whether you're a beginner or advanced learner, DuetReader adapts to your level and helps you progress at your own pace. Download DuetReader today and discover the joy of reading in any language.