Comparison

DuoCards vs Lengio

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

Head to head
About

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.

Highlights
  • 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
Features
Read full description

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

About

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.

Highlights
  • Image-based vocabulary learning
  • Spaced repetition flashcards
  • AI speech partner for pronunciation
  • Guided lessons and word categories
  • Customizable images for vocabulary
  • 25 languages supported
Features
Read full description

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

DuoCards4 screens
Lengio4 screens

Verdict

The call

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

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

DuoCards ships an update monthly, Lengio every 3 days. The most recent releases landed on October 20, 2026 and October 6, 2026 respectively.

Scorecard6 real differences · 4 level
DuoCards versus Lengio: the parameters behind the verdict, then further details
ParameterDuoCardsLengio
PriceFreeFree
Rating4.7 (1.4K ratings)5.0 (6 ratings) — better
Positive reviews63.1% of reviews100.0% of reviews — better
Number of ratings1.4K — better6
Update frequencyMonthlyEvery 3 days — better
AdsYesNo — better
In-app purchasesYesYes
MonetizationFree with in-app purchasesFreemium
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS13.0 — better17.0
Further details — not scored
Size19 MB591 MB
Age rating4+4+
DeveloperDuoCards s.r.oNexios Media LLC

Customer experience

DuoCards

All ratings1,340 ratings
Positive93.4%
Neutral2.5%
Negative4.2%
Written reviews594 reviews
Positive63.1%
Neutral10.4%
Negative26.4%

Lengio

All ratings6 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews4 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

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

10 purchases

DuoCards

Subscriptions10
  • DuoCards Premium2 variants$19.991 Month
  • DuoCards Plus$33.003 Months
  • DuoCards Premium$34.993 Months
Show 7 more
  • 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
3 purchases

Lengio

Subscriptions2
  • Lengio Plus7 Days trial$7.991 Month
  • Lengio Plus7 Days trial$49.991 Year
One-time1
  • Lengio Plus Lifetime$199.00

Questions

Is DuoCards free?
DuoCards is free to download, with in-app purchases available.
Is Lengio free?
Lengio is free to download, with in-app purchases available.
Which has better reviews, DuoCards or Lengio?
Lengio is rated higher. DuoCards averages 4.7 out of 5 from 1.4K ratings, while Lengio averages 5.0 from 6 ratings.
Do DuoCards or Lengio have ads?
DuoCards shows ads; Lengio does not.
Which is updated more often, DuoCards or Lengio?
DuoCards ships an update monthly, and Lengio every 3 days. Most recently, DuoCards was updated on October 20, 2026 and Lengio on October 6, 2026.

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