# Red Book® vs PREP Self

The clearest difference is review sentiment: PREP Self at 67% against Red Book®'s 0%. PREP Self also leads on in-app purchases (none vs 2) and update cadence (daily vs every 11 months). Red Book®'s advantage is rating (4.8 vs 3.7) and ratings volume (67 vs 9). On price, ads, device support and iOS requirement there is nothing between them.

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

Red Book® holds the better App Store score, 4.8 against 3.7. That said, the two scores are not equally well evidenced: Red Book® has 67 ratings behind it against 9, so its average is the more settled of the two. Written reviews complicate that: 0% of Red Book®'s written reviews are positive against 67% of PREP Self's, so the app with the better star average is not the one people write more warmly about.

Red Book® ships an update every 11 months, PREP Self daily. The most recent releases landed on September 24, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Red Book® | PREP Self |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (67 ratings)](https://appshunter.io/ios/app/red-book/id1586673573/reviews)** | [3.7 (9 ratings)](https://appshunter.io/ios/app/prep-self-assessments-program/id6756599702/reviews) |
| Number of ratings | **67** | 9 |
| Positive reviews | 0.0% of reviews | **66.7% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Daily** |
| Monetization | Free with in-app purchases | **Free** |
| Size | 9 MB | 44 MB |
| Requires iOS | **15.0** | 15.6 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPad, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [American Academy of Pediatrics](https://appshunter.io/developer/409863343) |

## What reviewers say

### 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 |


### PREP Self

[App page](https://appshunter.io/ios/app/prep-self-assessments-program/id6756599702)

Access trusted pediatric learning content through a new mobile app. Build a personalized question bank by selecting blocks from various content areas to fit your learning style and schedule. Earn CME credits and MOC points with each block.

**Highlights:** Trusted PREP content, Customizable question bank, Case-based questions, Earn CME credits, Earn MOC points, Modern user interface

**In-app purchases:** none


## Frequently asked questions

### Is Red Book® free?

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

### Is PREP Self free?

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

### Which has better reviews, Red Book® or PREP Self?

Red Book® is rated higher. Red Book® averages 4.8 out of 5 from 67 ratings, while PREP Self averages 3.7 from 9 ratings.

### Do Red Book® or PREP Self have ads?

Neither Red Book® nor PREP Self shows ads.

### Which is updated more often, Red Book® or PREP Self?

Red Book® ships an update every 11 months, and PREP Self daily. Most recently, Red Book® was updated on September 24, 2026 and PREP Self on September 21, 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.*