# Retain vs Test Parent App

The clearest difference is in-app purchases: Test Parent App at none against Retain's 2. Test Parent App also leads on iOS requirement (13.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Retain sells 2 in-app purchases, starting at $4.99 per month. Test Parent App asks for nothing beyond the download.

## The numbers

| Metric | Retain | Test Parent App |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/retain-ai-flashcards/id6469217518/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 88.9% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | — |
| Monetization | Freemium | — |
| Size | 54 MB | 27 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Paul Evans](https://appshunter.io/developer/1711681032) | [Metaguard Mobitech Llp](https://appshunter.io/developer/1648235349) |

## What reviewers say

### Retain

[App page](https://appshunter.io/ios/app/retain-ai-flashcards/id6469217518)

This minimalist flashcard app uses AI to help you create and study. Its intelligent spaced repetition algorithm optimizes review intervals for efficient learning and rapid progress. Choose from different card layouts to keep your study sessions engaging.

**Highlights:** AI-generated flashcards, Customizable card layouts, Spaced repetition algorithm, Minimalist design, Progress tracking

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $4.99 | per month |
| Premium Yearly | $29.99 | per year |


### Test Parent App

[App page](https://appshunter.io/ios/app/test-parent-app/id6478282080)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Retain free?

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

### Is Test Parent App free?

Test Parent App is free to download, with no in-app purchases.

### Do Retain or Test Parent App have ads?

Neither Retain nor Test Parent App shows ads.

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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.*