Comparison

Duoler vs Immersea

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Duoler

Features
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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/

About

Immersea

Read full description

Learn Spanish, Japanese, and any language from the videos and podcasts you already watch, not canned lessons. Immersea turns YouTube links, podcast episodes, and your own files into interactive language lessons. Read along and learn with subtitles synced to playback: dual captions in the source language and yours. Tap any word for an instant definition, save it to your vocabulary list, and review with flashcards and spaced repetition practice. WHY IMMERSEA Most apps teach from their own curriculum. Immersea lets you learn from real content in the language you choose: Spanish, French, Japanese, Korean, German, and more. Bring a YouTube video, a podcast episode, or a file you care about. Immersea adds dual subtitles, tap-to-learn definitions, and a personal word library. HOW IT WORKS 1. Paste a YouTube link, podcast URL, video file, or text 2. Choose the language you are learning 3. Follow along with dual captions synced to playback 4. Tap any word for meaning, examples, and pronunciation 5. Save words to your vocabulary library 6. Practice with flashcards and spaced repetition when words are due FEATURES • Learn Spanish, Japanese, Korean, and more from YouTube, podcasts, and video • Dual subtitles: source language + your learning language • Tap any word for AI definitions in context • Build your personal vocabulary from real content • Flashcards and listening practice • Spaced repetition: review words at the right time • Works with content you find, not a fixed course library PERFECT FOR • Learners who want language immersion from native content, not drills • Intermediate learners building vocabulary from real speech • Anyone who learns best from podcasts, vlogs, and real-world video Start with a link you love. Turn it into a lesson. Build vocabulary you will actually use, in whatever language you are learning. Download Immersea and learn from content that keeps you watching. LEGAL Privacy Policy: https://immersea-web.vercel.app/privacy Terms of Use: https://immersea-web.vercel.app/terms Apple Standard EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Duoler4 screens
Immersea4 screens

Verdict

The call

The clearest difference is update cadence: Immersea at every 10 days against Duoler's every 6 weeks. Immersea also leads on device support (3 vs 1) and iOS requirement (15.1 vs 18.1). On price, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Duoler sells 2 in-app purchases, starting at $2.99 per month and Immersea sells 2 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

Duoler ships an update every 6 weeks, Immersea every 10 days. The most recent releases landed on October 7, 2026 and September 23, 2026 respectively.

Scorecard3 real differences · 3 level
Duoler versus Immersea: the parameters behind the verdict, then further details
ParameterDuolerImmersea
PriceFreeFree
Update frequencyEvery 6 weeksEvery 10 days — better
AdsNoNo
In-app purchasesYesYes
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS18.115.1 — better
Further details — not scored
Size634 MB54 MB
Age rating4+4+
Developer翠涓 徐Amine Elbarry

In-app purchases

2 purchases

Duoler

Subscriptions2
  • Monthly Subscription$2.991 Month
  • Annual Subscription$24.991 Year
2 purchases

Immersea

Subscriptions2
  • Immersea Monthly Plan3 Days trial$7.991 Month
  • Immersea Yearly Plan$59.991 Year

Questions

Is Duoler free?
Duoler is free to download, with in-app purchases available.
Is Immersea free?
Immersea is free to download, with in-app purchases available.
Do Duoler or Immersea have ads?
Neither Duoler nor Immersea shows ads.
Which is updated more often, Duoler or Immersea?
Duoler ships an update every 6 weeks, and Immersea every 10 days. Most recently, Duoler was updated on October 7, 2026 and Immersea on September 23, 2026.

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