Duoler vs StoryReader
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Duoler
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Learn a language from the videos you actually want to watch. Import a movie, show, lecture or any other video from the Files app. No subtitles? Duoler creates them with AI right on your iPhone, and can add a translation line to make bilingual subtitles. Tap any word or sentence to translate it, then save it to your notebook together with the video frame and audio clip. AI SUBTITLES ON YOUR IPHONE β’ Speech recognition in 11 languages: English, Chinese (Simplified and Traditional), Cantonese, Japanese, Korean, French, German, Spanish, Italian and Portuguese β’ Bilingual subtitles with translation into 20 languages β’ Everything runs on your device. Your videos are never uploaded TAP TO TRANSLATE β’ Tap a word or a whole sentence while you watch β’ Uses Apple's on-device translation (iOS downloads each language once) A NOTEBOOK WITH CONTEXT β’ Double-tap a word to save it, or save the whole sentence β’ Every item keeps the video frame and audio clip it came from, so you can hear it again MADE FOR LISTENING PRACTICE β’ Split a video into 3- or 5-minute practice sections β’ Move through Listen, Study and Review phases, with subtitles hidden when needed β’ Loop one sentence, mark difficult moments, and resume where you stopped β’ Review saved words and sentences with their original audio β’ Jump by sentence or 10 seconds, change speed, and adjust subtitle timing MORE LOCAL VIDEO FORMATS β’ Reference the original file to save space, or keep an independent copy in Duoler β’ Local playback for common formats including MKV and WebM with VP9 or AV1, when the file's tracks are supported YOUR OWN SUBTITLES WORK TOO β’ Import SRT, VTT or ASS/SSA files β’ Edit subtitle text and timing, and export SRT files PRIVATE BY DESIGN No account, no ads, no tracking. Your videos, subtitles and notebook stay on your device. FREE AND PREMIUM Free: play videos with your own subtitles, tap to translate, save unlimited words and sentences, create AI subtitles for 5 minutes a day (up to 5 minutes per video), and export the subtitles you imported. Premium: unlimited AI subtitles and export of AI-generated subtitles, billed monthly or yearly. Eligible new subscribers can try the yearly plan free. Payment is charged to your Apple Account at confirmation of purchase. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the current period. Manage or cancel in Settings > [your name] > Subscriptions. Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/ Privacy Policy: https://duoler.vercel.app/privacy
StoryReader
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StoryReader β Learn English: read stories and grow your vocabulary StoryReader β Learn English helps you learn languages by reading. Open a story, tap any word to see its definition and hear it with text-to-speech (TTS). Save words to your vocabulary, review with flashcards and quizzes, and read with bilingual mode when you want a translation of the current passage. Read from many sources β’ Built-in stories to start reading right away β’ Project Gutenberg β thousands of free classic books β’ Your own .txt files β’ Google Sheets and RSS feeds Learn as you read β’ Tap a word for definition and translation β’ Hear pronunciation with TTS (system or online engine) β’ Save words to your vocabulary with optional notes β’ Highlight sentences and translate them Review and remember β’ Vocabulary list with filters and sorting β’ Flashcards with TTS on flip β’ Quiz: pick the right word for the definition (4+ words) β’ Paste text to extract and add words in bulk Comfortable reading β’ Adjustable font size, line height, and background β’ Light, dark, or system theme β’ Bookmarks, table of contents, and search in story β’ Reading goals and simple stats For everyone β’ Supports 8 languages for the app interface (e.g. English, Vietnamese, German, Spanish, French, Japanese, Russian, Chinese) β’ TTS for multiple languages with fallback to English when needed Download StoryReader β Learn English and turn reading into a habit that builds your vocabulary every day.
Screenshots
Verdict
The clearest difference is in-app purchases: StoryReader at none against Duoler's 2. StoryReader also leads on update cadence (every 5 weeks vs every 3 months) and device support (3 vs 1). Duoler's advantage is ads (none vs shown). On price there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. Duoler sells 2 in-app purchases, starting at $2.99 per month. StoryReader asks for nothing beyond the download.
Duoler ships an update every 3 months, StoryReader every 5 weeks. The most recent releases landed on October 30, 2026 and November 5, 2026 respectively.
| Parameter | Duoler | StoryReader |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 months | Every 5 weeks β better |
| Ads | No β better | Yes |
| In-app purchases | Yes | No β better |
| Devices | iPhone | iPhone, iPad, iPod β better |
| Requires iOS | 18.1 | 15.5 β better |
| Further details β not scored | ||
| Size | 642 MB | 87 MB |
| Age rating | 4+ | 4+ |
| Developer | ηΏ ζΆ εΎ | Thanh Truong |
In-app purchases
Duoler
- Monthly Subscription$2.991 Month
- Annual Subscription7 Days trial$24.991 Year
StoryReader
No in-app purchases









