SubPlay vs Duoler
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
SubPlay
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In this product, you can learn languages using YouTube videos powered by AI. App Features: * Speak along with audio * Listening review * Tag search * In-app YouTube * Subtitle list search * Subtitle list translation * Partial subtitle translation * History of partial subtitle translations * Review of partial translations * Bookmark videos/subtitles * Video search and filtering * Video viewing history * Multilingual support You can also learn the following languages in this app: * Japanese * English * Korean * Spanish * French * German * Italian * Portuguese * Hindi * Arabic * Russian * Simplified Chinese * Traditional Chinese For more details, please check the landing page: https://sub-play.netlify.app/en/top
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
Screenshots
Verdict
The clearest difference is update cadence: SubPlay at every 3 weeks against Duoler's every 3 months. SubPlay also leads on iOS requirement (16.0 vs 18.1). On price, ads, in-app purchases and device support 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. SubPlay sells 3 in-app purchases, starting at $2.99 per month and Duoler sells 2 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.
SubPlay ships an update every 3 weeks, Duoler every 3 months. The most recent releases landed on November 8, 2026 and October 30, 2026 respectively.
| Parameter | SubPlay | Duoler |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 3 weeks β better | Every 3 months |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad β better | iPhone |
| Requires iOS | 16.0 β better | 18.1 |
| Further details β not scored | ||
| Size | 63 MB | 642 MB |
| Age rating | 4+ | 4+ |
| Developer | Vadim Petrov | ηΏ ζΆ εΎ |
In-app purchases
SubPlay
- Mini Plan3 Days trial$2.991 Month
- Basic Plan3 Days trial$4.991 Month
- Study Plan$7.991 Month
Duoler
- Monthly Subscription$2.991 Month
- Annual Subscription7 Days trial$24.991 Year









