# C Library Reference vs Mental Math Learning Cards

The clearest difference is in-app purchases: C Library Reference at none against Mental Math Learning Cards's 18. C Library Reference also leads on ads (none vs shown) and update cadence (every 3 days vs weekly). On price and device support there is nothing between them.

Both are free to download. Mental Math Learning Cards sells 18 in-app purchases, starting at $1.99 per 7 days. C Library Reference asks for nothing beyond the download.

C Library Reference ships an update every 3 days, Mental Math Learning Cards weekly. The most recent releases landed on October 5, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | C Library Reference | Mental Math Learning Cards |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.3 (7 ratings)](https://appshunter.io/ios/app/mental-math-learning-cards/id6756258865/reviews)** |
| Number of ratings | — | **7** |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | **Every 3 days** | Weekly |
| Monetization | — | Free with in-app purchases |
| Size | 3 MB | 72 MB |
| Requires iOS | **17.0** | 26.0 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Roger Rub](https://appshunter.io/developer/1852594545) | [Coffee Bytes LDA](https://appshunter.io/developer/1859577848) |

## What reviewers say

### C Library Reference

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Mental Math Learning Cards

[App page](https://appshunter.io/ios/app/mental-math-learning-cards/id6756258865)

Enhance your calculation speed and accuracy with focused daily workouts. This app offers progressive levels, skill tests, and math games to improve arithmetic abilities. Track your progress with a Math IQ score and sync across devices.

**Highlights:** Personalized practice sessions, Skill level testing, Math games and drills, Progressive difficulty levels, Math IQ tracking, Cloud synchronization

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

**In-app purchases (18)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pro Version | $1.99 | per 7 days |
| Pro Version | $5.99 | per month |
| Pro Version | $7.99 | per month |
| Pro Version | $9.99 | per year |
| Pro Version | $9.99 | per year |
| Pro Version | $24.99 | per year |
| Pro Version | $29.99 | per year |
| Pro Version | $29.99 | per year |
| Pro Version | $4.99 | one-time |
| Pro Version | $5.99 | one-time |
| Pro Version | $7.99 | one-time |
| Pro Version | $8.99 | one-time |
| Pro Version | $9.99 | one-time |
| Pro Version | $11.99 | one-time |
| Pro Version | $59.99 | one-time |
| Pro Version | $79.99 | one-time |
| Pro Version | $99.99 | one-time |
| Pro Version | $119.99 | one-time |


## Frequently asked questions

### Is C Library Reference free?

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

### Is Mental Math Learning Cards free?

Mental Math Learning Cards is free to download, with in-app purchases available.

### Do C Library Reference or Mental Math Learning Cards have ads?

Mental Math Learning Cards shows ads; C Library Reference does not.

### Which is updated more often, C Library Reference or Mental Math Learning Cards?

C Library Reference ships an update every 3 days, and Mental Math Learning Cards weekly. Most recently, C Library Reference was updated on October 5, 2026 and Mental Math Learning Cards on September 27, 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.*