# ciTBI Calc vs Red Book®

The clearest difference is in-app purchases: ciTBI Calc at none against Red Book®'s 2. ciTBI Calc also leads on iOS requirement (12.1 vs 15.0). On price, ads and device support there is nothing between them.

Both are free to download. Red Book® sells 2 one-off in-app purchases. ciTBI Calc asks for nothing beyond the download.

## The numbers

| Metric | ciTBI Calc | Red Book® |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.8 (71 ratings)](https://appshunter.io/ios/app/red-book/id1586673573/reviews)** |
| Number of ratings | — | **71** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 months |
| Monetization | — | Free with in-app purchases |
| Size | 7 MB | 10 MB |
| Requires iOS | **12.1** | 15.0 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Mac** |
| Age rating | 4+ | 17+ |
| Developer | [Interpretable AI LLC](https://appshunter.io/developer/1805627984) | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) |

## What reviewers say

### ciTBI Calc

[App page](https://appshunter.io/ios/app/citbi-calc/id1470318918)

**Features:** macOS Compatibility

**In-app purchases:** none


### Red Book®

[App page](https://appshunter.io/ios/app/red-book/id1586673573)

This app provides the latest information on pediatric infectious diseases from the American Academy of Pediatrics. It includes immunization schedules, vaccine status, influenza resources, and new chapters on COVID-19 and Mpox. Features like note-taking and enhanced search aid quick access to essential medical data.

**Highlights:** Immunization schedules, Vaccine status table, Influenza resources, COVID-19 and Mpox chapters, Note-taking and highlighting, Enhanced search functionality

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Red Book 32e | $99.99 | one-time |
| Red Book | $99.99 | one-time |


## Frequently asked questions

### Is ciTBI Calc free?

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

### Is Red Book® free?

Red Book® is free to download, with in-app purchases available.

### Do ciTBI Calc or Red Book® have ads?

Neither ciTBI Calc nor Red Book® shows ads.

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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.*