# KeyReader vs Self Study CS

The clearest difference is in-app purchases: Self Study CS at none against KeyReader's 3. Self Study CS also leads on update cadence (daily vs every 3 weeks). KeyReader's advantage is ads (none vs shown). On price, device support and iOS requirement there is nothing between them.

Both are free to download. KeyReader sells 3 in-app purchases, starting at $2.99 per month. Self Study CS asks for nothing beyond the download.

KeyReader ships an update every 3 weeks, Self Study CS daily. Both last shipped on October 7, 2026.

## The numbers

| Metric | KeyReader | Self Study CS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | **No** |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Daily** |
| Size | 7 MB | 15 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | iPhone | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Oleg Strigunov](https://appshunter.io/developer/1705947979) | [APPS BAY LIMITED](https://appshunter.io/developer/1599035519) |

## What reviewers say

### KeyReader

[App page](https://appshunter.io/ios/app/keyreader/id6762510058)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlimited Reading | $2.99 | per month |
| Unlimited Reading | $19.99 | per year |
| Unlimited Reading | $49.99 | one-time |


### Self Study CS

[App page](https://appshunter.io/ios/app/self-study-cs-learn-to-code/id6765632695)

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

**In-app purchases:** none


## Frequently asked questions

### Is KeyReader free?

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

### Is Self Study CS free?

Self Study CS is free to download, with no in-app purchases.

### Do KeyReader or Self Study CS have ads?

Self Study CS shows ads; KeyReader does not.

### Which is updated more often, KeyReader or Self Study CS?

KeyReader ships an update every 3 weeks, and Self Study CS daily. Most recently, KeyReader was updated on October 7, 2026 and Self Study CS 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.*