# Bac II Calculator vs C4official

The clearest difference is in-app purchases: Bac II Calculator at none against C4official's 2. Bac II Calculator also leads on device support (3 vs 1) and iOS requirement (12.0 vs 16.4). C4official's advantage is ads (none vs shown). On price and update cadence there is nothing between them.

Both are free to download. C4official sells 2 one-off in-app purchases. Bac II Calculator asks for nothing beyond the download.

Bac II Calculator ships an update every 11 months, C4official every 8 months. The most recent releases landed on November 7, 2026 and November 8, 2026 respectively.

## The numbers

| Metric | Bac II Calculator | C4official |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 11 months | **Every 8 months** |
| Size | 32 MB | 85 MB |
| Requires iOS | **12.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 17+ |
| Developer | [Cheab Kunthea](https://appshunter.io/developer/1073035288) | [TagMango Inc](https://appshunter.io/developer/1611765353) |

## What reviewers say

### Bac II Calculator

[App page](https://appshunter.io/ios/app/bac-ii-calculator/id1434586040)

**Features:** macOS Compatibility

**In-app purchases:** none


### C4official

[App page](https://appshunter.io/ios/app/c4official/id6737413255)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| C4 L2: Expansion Membership | $29.99 | one-time |
| C4L1: DIY Meta Ads | $49.99 | one-time |


## Frequently asked questions

### Is Bac II Calculator free?

Bac II Calculator is free to download, with no in-app purchases.

### Is C4official free?

C4official is free to download, with in-app purchases available.

### Do Bac II Calculator or C4official have ads?

Bac II Calculator shows ads; C4official does not.

### Which is updated more often, Bac II Calculator or C4official?

Bac II Calculator ships an update every 11 months, and C4official every 8 months. Most recently, Bac II Calculator was updated on November 7, 2026 and C4official on November 8, 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.*