DuoCards vs Lengio
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
DuoCards
Master a new language with interactive flashcards and video courses. This app helps you build vocabulary, guess words, and track your progress across over 50 languages. Learn effectively through spaced repetition and integrated translation tools.
- Flashcard learning with spaced repetition
- Video language courses with interactive subtitles
- Integrated translator for over 50 languages
- Vocabulary builder and progress tracker
- Guess words and phrases to sharpen skills
- Read foreign language articles
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Build vocabulary from the real content you already enjoy. DuoCards helps you save new words from videos, articles, shared decks, and your own notes, then remember them with smart flashcards and spaced repetition. Why learners choose DuoCards: - Save words and phrases from videos, subtitles, and articles - Practice with an AI tutor for real-life conversations - Improve pronunciation with instant feedback - Review vocabulary with flashcards that adapt to your progress - Learn English, Spanish, French, German, Japanese, Korean, and 50+ languages - Use ready-made courses, public decks, or your own personal word lists Learn in a simple loop: 1. Discover useful words in context 2. Save them to your personal deck 3. Review, speak, listen, and remember Whether you are learning for travel, school, work, or everyday conversations, DuoCards gives you a flexible way to build vocabulary and keep it in memory. Download DuoCards and start building your language habit today. Terms of use: https://www.duocards.com/termsofuse.html Privacy policy: https://www.duocards.com/privacypolicy.html
Lengio
This app uses images and spaced repetition to help you learn vocabulary in 25 languages. Engage in AI-powered conversations for pronunciation practice and customize your learning with personal photos.
- Image-based vocabulary learning
- Spaced repetition flashcards
- AI speech partner for pronunciation
- Guided lessons and word categories
- Customizable images for vocabulary
- 25 languages supported
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Words that actually stick. Most language apps are built around streaks, pressure, and guilt. Lengio isn't. It's a calm, beautifully designed visual vocabulary app that works with the way your brain actually remembers — through images, not endless text drills. LEARN THE WAY THAT WORKS FOR YOU Lessons Follow a guided path that builds naturally from the ground up, with mini-exercises after every concept to lock in what you've learned. Word Categories Browse thousands of words organised by topic across 25 languages. Words live across multiple categories so you encounter them in context — the way real fluency is actually built. Quizzes & Flashcards Spaced repetition built right in, so you review each word at exactly the moment you'd otherwise forget it. No wasted time, no drilling words you already know cold. AI Speech Partner Hold the mic and have a real, free-form conversation with an AI tutor in your target language. Gentle, contextual pronunciation feedback as you speak — like having a patient language partner available any time. 221,000+ WORDS. 25 LANGUAGES. From Arabic to Ukrainian, from Japanese to Portuguese — Lengio covers 25 languages with over 221,000 words, every one paired with an image to anchor it in visual memory. Because a word tied to a picture is a word you actually keep. MAKE IT YOURS Replace any stock image with a photo from your own camera roll. Your memories, your associations, your language. The more personal the image, the deeper the word sticks. FREE & PLUS Lengio is free to download. Core lessons, word browsing, flashcards, and daily reviews are included at no cost. Lengio Plus is an optional auto-renewing subscription that unlocks unlimited daily reviews, the AI Speech Partner, all word categories, custom card images, and full Did You Know card access. Payment is charged to your Apple ID at confirmation of purchase. Subscription automatically renews unless cancelled at least 24 hours before the end of the current period. Manage or cancel anytime in your Apple ID account settings. No streak guilt. No leaderboards. No cartoon mascot judging your progress. Just a language app you'll actually want to open — every single day. Your next language starts right now. Support: https://lengio.app/support Privacy: https://lengio.app/privacy
Screenshots
Verdict
The clearest difference is review sentiment: Lengio at 100% against DuoCards's 63%. Lengio also leads on ads (none vs shown) and update cadence (every 3 days vs monthly). DuoCards's advantage is ratings volume (1.4K vs 6) and iOS requirement (13.0 vs 17.0). On price, in-app purchases, monetization model and device support 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
Both are free to download. DuoCards sells 10 in-app purchases, starting at $19.99 per month and Lengio sells 3 in-app purchases, starting at $7.99 per month. Whichever you choose, the download price is not the number that matters.
Lengio holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: DuoCards has 1.4K ratings behind it against 6, so its average is the more settled of the two. Written reviews point the same way: 63% of DuoCards's written reviews are positive against 100% of Lengio's.
DuoCards ships an update monthly, Lengio every 3 days. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.
| Parameter | DuoCards | Lengio |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (1.4K ratings) | 5.0 (6 ratings) — better |
| Positive reviews | 63.1% of reviews | 100.0% of reviews — better |
| Number of ratings | 1.4K — better | 6 |
| Update frequency | Monthly | Every 3 days — better |
| Ads | Yes | No — better |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | Freemium |
| Devices | iPhone, iPad, iPod — better | iPhone, iPad |
| Requires iOS | 13.0 — better | 17.0 |
| Further details — not scored | ||
| Size | 19 MB | 591 MB |
| Age rating | 4+ | 4+ |
| Developer | DuoCards s.r.o | Nexios Media LLC |
Customer experience
DuoCards
Lengio
Bugs and requests
DuoCards
Reported bugs
4 issues- App freezes and crashes
- Issues with logging in and accessing content
- Inconsistent behavior when adding new words
- Problems with video playback and subtitles
Requested features
4 requests- Offline mode
- More customization options
- Improved spaced repetition system
- Better integration with other language learning tools
Lengio
Not enough reviews yet to summarise bugs or requests.
In-app purchases
DuoCards
- DuoCards Premium2 variants$19.991 Month
- DuoCards Plus$33.003 Months
- DuoCards Premium$34.993 Months
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- DuoCards Premium$49.991 Year
- DuoCards Premium7 Days trial$64.901 Year
- DuoCards Premium7 Days trial$67.991 Year
- DuoCards Premium1 Year trial$107.991 Year
- DuoCards Premium7 Days trial$109.001 Year
- DuoCards Premium7 Days trial$113.991 Year
- DuoCards Premium1 Year trial$162.991 Year
Lengio
- Lengio Plus7 Days trial$7.991 Month
- Lengio Plus7 Days trial$49.991 Year
- Lengio Plus Lifetime$199.00









