Duoler vs Mirra Speak
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Duoler
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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/
Mirra Speak
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EchoFlow turns any video or audio into a powerful shadowing lesson. Import YouTube, podcasts, movies, or local files, then practice with a focused, immersive workflow. Slogan: Turn What You Watch into How You Speak. Why EchoFlow? ● Anything becomes a lesson: paste a link or import a file to generate subtitles. ● Fast, accurate cloud transcription with Whisper. ● Smart segmentation into short, practice-ready sentences. ● Immersive Shadow Player: Listen → Echo → Speak → Replay. ● A/B loop and auto recording for effortless repetition. ● Waveform comparison between original and your recording. ● AI Explanation: sentence, grammar, and key phrase insights in your native language. ● Discovery hub with curated blogs, channels, and podcasts. Perfect for ● Exam prep (TOEFL/IELTS) ● Busy professionals improving spoken English ● Advanced learners who want real-world content Designed for fluency ● Smooth, low-latency practice ● Clear understanding without breaking the flow Start now and turn what you watch into how you speak. [Subscription Details - Monthly Plan] - Billing cycle: 1 month (auto-renewing) - Benefits: 30h/month AI transcription quota, unlimited AI analysis, AI coach conversations, unlimited bilingual translated subtitles [Subscription Details - Annual Plan] - Billing cycle: 1 year (auto-renewing) - Benefits: 30h/month AI transcription quota, unlimited AI analysis, AI coach conversations, unlimited bilingual translated subtitles [General Terms] - After purchase is confirmed, payment will be charged to your iTunes account. - The subscription renews automatically unless auto-renewal is turned off at least 24 hours before the end of the current period. - Renewal charges will be deducted from your account within 24 hours before the end of the current period. - After purchase, you can manage your subscription and turn off auto-renewal in Account Settings. - Any unused portion of a free trial period will be forfeited when you purchase a formal subscription (if applicable). Privacy Policy: https://my.feishu.cn/wiki/EGirwLvuIi2QTxk1puxcYJrsnJg Terms of Service (EULA): https://my.feishu.cn/wiki/EnrtwuXXoit6eWkJcKAcgQ8onYe
Screenshots
Verdict
Duoler and Mirra Speak are too close to call on the numbers: across 6 compared parameters — price, update cadence, ads and in-app purchases among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Duoler sells 2 in-app purchases, starting at $2.99 per month and Mirra Speak sells 2 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
Duoler ships an update every 6 weeks, Mirra Speak every 5 weeks. The most recent releases landed on September 20, 2026 and September 17, 2026 respectively.
| Parameter | Duoler | Mirra Speak |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 6 weeks | Every 5 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone | iPhone, iPad — better |
| Requires iOS | 18.1 | 18.0 — better |
| Further details — not scored | ||
| Size | 634 MB | 73 MB |
| Age rating | 4+ | 4+ |
| Developer | 翠涓 徐 | 彦辉 侯 |
In-app purchases
Duoler
- Monthly Subscription$2.991 Month
- Annual Subscription$24.991 Year
Mirra Speak
- 月订阅 Pro$4.991 Month
- 年度订阅Pro$39.991 Year









