# C Library Reference vs CardFlip

The clearest difference is update cadence: C Library Reference at every 3 days against CardFlip's every 6 weeks. CardFlip's advantage is iOS requirement (15.0 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.

C Library Reference ships an update every 3 days, CardFlip every 6 weeks. The most recent releases landed on October 5, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | C Library Reference | CardFlip |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.5 (4 ratings)](https://appshunter.io/ios/app/cardflip-flashcard-maker/id6766610610/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 days** | Every 6 weeks |
| Monetization | — | Free |
| Size | 3 MB | 53 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Roger Rub](https://appshunter.io/developer/1852594545) | [Gunawan Santoso](https://appshunter.io/developer/1843786072) |

## What reviewers say

### C Library Reference

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

**Features:** macOS Compatibility

**In-app purchases:** none


### CardFlip

[App page](https://appshunter.io/ios/app/cardflip-flashcard-maker/id6766610610)

Create and study custom flashcards with spaced repetition to optimize memorization. Offers multiple study modes like quiz and matching, with offline access and detailed progress tracking. Designed for students to learn vocabulary, terms, and formulas efficiently.

**Highlights:** Custom flashcard creation, Spaced repetition system, Multiple study modes (Flip, Quiz, Match, Type), Offline study capabilities, Progress tracking and analytics, Import/export flashcards

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

**In-app purchases:** none


## Frequently asked questions

### Is C Library Reference free?

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

### Is CardFlip free?

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

### Do C Library Reference or CardFlip have ads?

Neither C Library Reference nor CardFlip shows ads.

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

C Library Reference ships an update every 3 days, and CardFlip every 6 weeks. Most recently, C Library Reference was updated on October 5, 2026 and CardFlip on September 25, 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.*