Duoler

Learn Languages from Any Video

Only for iPhone

Free · In-App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Learn languages by watching videos! Import any video, auto-generate subtitles with on-device AI, tap to translate words and sentences. Immersive learning made effortless! Duoler - Learn Languages by Watching Videos Tired of boring vocabulary drills? Try Duoler! Import your favorite videos, generate subtitles with AI, and learn while you watch - in English, Japanese, Chinese, Korean, and more. KEY FEATURES AI Subtitle Generation No subtitles? No problem! Duoler uses on-device Whisper AI to transcribe speech in 11 languages - Simplified Chinese, Traditional Chinese, Japanese, Korean, Cantonese, English, French, German, Spanish, Italian, and Portuguese. Automatically generate bilingual subtitles with translation into 21 target languages. All processing stays on your device, completely private. Import Any Video Add your own video files with SRT, VTT, or ASS/SSA subtitles - or let AI generate them for you. Learn from movies, shows, lectures, or any video you love. Tap to Translate While watching, tap any word in the subtitles to instantly see its translation and definition. Tap a sentence to translate the whole line. Powered by Apple Translation with 21 languages supported - all on-device, no internet required. Smart Word Library Automatically saves words you look up or collect. Double-tap any word to instantly save it. Organize by date, video, or language pair. Each word retains its video context to help you remember. Sentence Book Collect entire sentences while watching - with auto-captured screenshots and audio clips from the video. Perfect for reviewing memorable dialogues and building comprehension. Subtitle Editor View and edit subtitle text and timing directly in the app. Fine-tune AI-generated or imported subtitles to perfection. SRT Export Export AI-generated subtitles as SRT files. Share your transcriptions or use them with other tools. (Premium) Multi-Language Support Transcribe speech in 11 languages and translate into 21 languages - mix and match to create the learning combination that works for you. App interface available in 23 languages. Playback Controls Adjust playback speed, subtitle timing offset, and subtitle background opacity. Navigate between subtitle lines with ease. [WHY DUOLER] - Contextual Learning - Learn words and sentences in real contexts, remember them longer - Interest-Driven - Learn with content you actually enjoy watching - AI-Powered - Generate subtitles for any video, even without existing subtitle files - Privacy First - All AI processing, videos, and learning data stay on your device - Smart Import - Import by reference to save storage, or copy for portability Download now and start your immersive language learning journey! --- Premium Subscription: - Unlock unlimited AI transcription, SRT subtitle export, and more - Free users enjoy unlimited word collection with 5 minutes/day AI transcription - Subscription auto-renews unless cancelled at least 24 hours before the end of the current period - Manage subscriptions in iPhone Settings > Apple ID > Subscriptions Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

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AI Subtitle Generation - On-device speech-to-text powered by Whisper AI - supports 11 languages - Automatic bilingual subtitle generation with translation - Background transcription with auto-save progress Sentence Book - Collect sentences while watching, with auto-captured screenshots and audio clips Multi-Language Learning - Transcribe 11 languages, translate into 21 languages - learn any combination - Tap-to-translate powered by Apple Translation (fully on-device) Subtitle Editor - View and edit subtitle text and timing within the app SRT Export - Export AI-generated subtitles as SRT files (Premium) Enhanced Video Experience - ASS/SSA subtitle format support - Import videos by reference to save storage - Playback speed control & subtitle timing adjustment

Version 1.2

The developer, 翠涓 徐, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary based, for example, on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Provider
    • 翠涓 徐
    Size
    • 665.1 MB
    Category
    • Education
    Compatibility
    Requires iOS 18.1 or later.
    • iPhone
      Requires iOS 18.1 or later.
    • Mac
      Requires macOS 15.1 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 2.1 or later.
    Languages
    English and 19 more
    • English, Arabic, Dutch, French, German, Hindi, Indonesian, Italian, Japanese, Korean, Polish, Portuguese, Russian, Simplified Chinese, Spanish, Thai, Traditional Chinese, Turkish, Ukrainian, Vietnamese
    Age Rating
    4+
    In-App Purchases
    Yes
    • Annual Subscription ₱ 1,490.00
    • Monthly Subscription ₱ 199.00
    • Learn More
    Copyright
    • © 2025 CuiJuan Xu
  • Privacy Policy

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