# DuoCards vs Lengio

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.

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 22, 2026 and October 6, 2026 respectively.

## The numbers

| Metric | DuoCards | Lengio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.4K ratings)](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917/reviews) | **[5.0 (6 ratings)](https://appshunter.io/ios/app/lengio-learn-languages/id6771510274/reviews)** |
| Number of ratings | **1.4K** | 6 |
| Positive reviews | 63.1% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | **No** |
| Update frequency | Monthly | **Every 3 days** |
| Monetization | Free with in-app purchases | Freemium |
| Size | 19 MB | 591 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DuoCards s.r.o](https://appshunter.io/developer/1508159916) | [Nexios Media LLC](https://appshunter.io/developer/1866479562) |

## What reviewers say

### DuoCards

[App page](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| DuoCards Premium | $19.99 | per month |
| DuoCards Plus | $33.00 | per 3 months |
| DuoCards Premium | $34.99 | per 3 months |
| DuoCards Premium | $49.99 | per year |
| DuoCards Premium | $64.90 | per year |
| DuoCards Premium | $67.99 | per year |
| DuoCards Premium | $107.99 | per year |
| DuoCards Premium | $109.00 | per year |
| DuoCards Premium | $113.99 | per year |
| DuoCards Premium | $162.99 | per year |

**What reviewers like**

- 👍 Easy to use
- 💡 Customizable flashcards
- 🚀 Efficient learning algorithm
- 🐘 Cute mascot (Memo the mammoth)

**What reviewers complain about**

- 🐛 Bugs and crashes
- ⚠️ Unreliable server connection
- 💰 Expensive subscription
- 🤔 Confusing interface

**Reported bugs**

- 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**

- Offline mode
- More customization options
- Improved spaced repetition system
- Better integration with other language learning tools


### Lengio

[App page](https://appshunter.io/ios/app/lengio-learn-languages/id6771510274)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lengio Plus | $7.99 | per month |
| Lengio Plus | $49.99 | per year |
| Lengio Plus Lifetime | $199.00 | one-time |


## Frequently asked 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 22, 2026 and Lengio on October 6, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*