# DuoCards vs Sinonimos ES

The clearest difference is in-app purchases: Sinonimos ES at none against DuoCards's 11. Sinonimos ES also leads on ads (none vs shown). DuoCards's advantage is update cadence (monthly vs every 11 months). On price, device support and iOS requirement there is nothing between them.

Both are free to download. DuoCards sells 10 in-app purchases, starting at $19.99 per month. Sinonimos ES asks for nothing beyond the download.

DuoCards ships an update monthly, Sinonimos ES every 11 months. The most recent releases landed on October 27, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | DuoCards | Sinonimos ES |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.4K ratings)](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917/reviews)** | — |
| Number of ratings | **1.4K** | — |
| Positive reviews | 63.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Monthly** | Every 11 months |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 65 MB |
| Requires iOS | 13.0 | **12.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [DuoCards s.r.o](https://appshunter.io/developer/1508159916) | [Ivo Fernandes](https://appshunter.io/developer/1251123569) |

## 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


### Sinonimos ES

[App page](https://appshunter.io/ios/app/sinonimos-es/id6471038342)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is DuoCards free?

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

### Is Sinonimos ES free?

Sinonimos ES is free to download, with no in-app purchases.

### Do DuoCards or Sinonimos ES have ads?

DuoCards shows ads; Sinonimos ES does not.

### Which is updated more often, DuoCards or Sinonimos ES?

DuoCards ships an update monthly, and Sinonimos ES every 11 months. Most recently, DuoCards was updated on October 27, 2026 and Sinonimos ES on October 7, 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.*