# PrepAiro GRE vs Enchiridion

The clearest difference is in-app purchases: PrepAiro GRE at none against Enchiridion's 2. PrepAiro GRE also leads on iOS requirement (13.0 vs 17.0). On price, ads and device support there is nothing between them.

Both are free to download. Enchiridion sells 2 in-app purchases, starting at $12.99 per month. PrepAiro GRE asks for nothing beyond the download.

## The numbers

| Metric | PrepAiro GRE | Enchiridion |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/enchiridion-microlearning-app/id6757939608/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 4 days |
| Monetization | — | Subscription |
| Size | 145 MB | 95 MB |
| Requires iOS | **13.0** | 17.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 17+ | 12+ |
| Developer | [PrepAIro](https://appshunter.io/developer/1795391659) | [Zachary Highley-Gergel](https://appshunter.io/developer/1869789589) |

## What reviewers say

### PrepAiro GRE

[App page](https://appshunter.io/ios/app/prepairo-gre/id6757590892)

**In-app purchases:** none


### Enchiridion

[App page](https://appshunter.io/ios/app/enchiridion-microlearning-app/id6757939608)

This app helps you retain knowledge long-term using science-backed spaced repetition. It offers structured learning paths, articles, and progress tracking for various topics. Access all features through an auto-renewing subscription.

**Highlights:** Spaced repetition study sessions, Structured learning paths, Deep-dive articles, Progress tracking and streaks, iCloud sync, Personal finance, health, philosophy topics

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium Monthly | $12.99 | per month |
| Premium Annual | $99.99 | per year |


## Frequently asked questions

### Is PrepAiro GRE free?

PrepAiro GRE is free to download, with no in-app purchases.

### Is Enchiridion free?

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

### Do PrepAiro GRE or Enchiridion have ads?

Neither PrepAiro GRE nor Enchiridion 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.*