# DuoCards vs Zero Shadow Day

The clearest difference is in-app purchases: Zero Shadow Day at none against DuoCards's 11. Zero Shadow Day also leads on ads (none vs shown). DuoCards's advantage is iOS requirement (13.0 vs 16.0). On price 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. Zero Shadow Day asks for nothing beyond the download.

## The numbers

| Metric | DuoCards | Zero Shadow Day |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (1.3K ratings)](https://appshunter.io/ios/app/duocards-vocabulary-builder/id1508159917/reviews)** | — |
| Number of ratings | **1.3K** | — |
| Positive reviews | 63.1% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | Monthly | — |
| Monetization | Free with in-app purchases | — |
| Size | 19 MB | 52 MB |
| Requires iOS | **13.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [DuoCards s.r.o](https://appshunter.io/developer/1508159916) | [Alok Mandavgane](https://appshunter.io/developer/6795132798) |

## 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


### Zero Shadow Day

[App page](https://appshunter.io/ios/app/zero-shadow-day/id6795132796)

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

**In-app purchases:** none


## Frequently asked questions

### Is DuoCards free?

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

### Is Zero Shadow Day free?

Zero Shadow Day is free to download, with no in-app purchases.

### Do DuoCards or Zero Shadow Day have ads?

DuoCards shows ads; Zero Shadow Day does not.

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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.*