# DuoCards vs Fastlingo

The clearest difference is ratings volume: DuoCards at 1.4K against Fastlingo's 1. DuoCards also leads on iOS requirement (13.0 vs 15.0). Fastlingo's advantage is rating (5.0 vs 4.7). On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. DuoCards sells 10 in-app purchases, starting at $19.99 per month and Fastlingo sells 1 in-app purchase, starting at $3.99 per month. Whichever you choose, the download price is not the number that matters.

Fastlingo 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 1, so its average is the more settled of the two.

DuoCards ships an update monthly, Fastlingo every 4 weeks. The most recent releases landed on October 27, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | DuoCards | Fastlingo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.7 (1.4K ratings)](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/fastlingo/id6743956936/reviews)** |
| Number of ratings | **1.4K** | 1 |
| Positive reviews | 63.1% of reviews | — |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Monthly | **Every 4 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 19 MB | 38 MB |
| Requires iOS | **13.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [DuoCards s.r.o](https://appshunter.io/developer/1508159916) | [Mihai Ionescu](https://appshunter.io/developer/1805327977) |

## 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


### Fastlingo

[App page](https://appshunter.io/ios/app/fastlingo/id6743956936)

Learn languages through a structured progression of 10,000 carefully-graded sentences, each with concise grammar notes. This app offers a calm, consistent learning experience designed to prevent burnout and build confidence from beginner to intermediate levels.

**Highlights:** 10,000 graded sentences, Concise grammar notes, Continuous progression, Micro-learning design, Four languages available, Pronunciation practice, Voice recording and recognition

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Renewable monthly subscription | $3.99 | per month |


## Frequently asked questions

### Is DuoCards free?

DuoCards is free to download, with in-app purchases available.

### Is Fastlingo free?

Fastlingo is free to download, with in-app purchases available.

### Which has better reviews, DuoCards or Fastlingo?

Fastlingo is rated higher. DuoCards averages 4.7 out of 5 from 1.4K ratings, while Fastlingo averages 5.0 from 1 ratings.

### Do DuoCards or Fastlingo have ads?

Both DuoCards and Fastlingo show ads.

### Which is updated more often, DuoCards or Fastlingo?

DuoCards ships an update monthly, and Fastlingo every 4 weeks. Most recently, DuoCards was updated on October 27, 2026 and Fastlingo on October 28, 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.*