# Einführung in C vs C Library Reference

The clearest difference is update cadence: C Library Reference at every 3 days against Einführung in C's every 17 months. Einführung in C's advantage is iOS requirement (11.0 vs 17.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Einführung in C ships an update every 17 months, C Library Reference every 3 days. The most recent releases landed on October 3, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Einführung in C | C Library Reference |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 3 days** |
| Size | 18 MB | 3 MB |
| Requires iOS | **11.0** | 17.0 |
| Devices | iPad | **iPhone, iPad** |
| Age rating | 4+ | 4+ |
| Developer | [Eberhard Heuel](https://appshunter.io/developer/881793184) | [Roger Rub](https://appshunter.io/developer/1852594545) |

## What reviewers say

### Einführung in C

[App page](https://appshunter.io/ios/app/einfuhrung-in-c/id1418096337)

**Features:** macOS Compatibility

**In-app purchases:** none


### C Library Reference

[App page](https://appshunter.io/ios/app/c-library-reference/id6756002515)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Einführung in C free?

Einführung in C is free to download, with no in-app purchases.

### Is C Library Reference free?

C Library Reference is free to download, with no in-app purchases.

### Do Einführung in C or C Library Reference have ads?

Neither Einführung in C nor C Library Reference shows ads.

### Which is updated more often, Einführung in C or C Library Reference?

Einführung in C ships an update every 17 months, and C Library Reference every 3 days. Most recently, Einführung in C was updated on October 3, 2026 and C Library Reference on October 5, 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.*