# Red Book® vs SIMPL

The clearest difference is rating: Red Book® at 4.8 against SIMPL's 4.1. Red Book® also leads on chart position (#196 vs unranked) and ratings volume (67 vs 16). SIMPL's advantage is review sentiment (40% vs 0%) and in-app purchases (none vs 2). On price, ads and iOS requirement there is nothing between them.

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

Red Book® holds the better App Store score, 4.8 against 4.1. Both are backed by a comparable volume of ratings — 67 and 16 respectively. Written reviews complicate that: 0% of Red Book®'s written reviews are positive against 40% of SIMPL'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, SIMPL every 2 weeks. The most recent releases landed on October 13, 2026 and October 5, 2026 respectively.

## The numbers

| Metric | Red Book® | SIMPL |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (67 ratings)](https://appshunter.io/ios/app/red-book/id1586673573/reviews)** | [4.1 (16 ratings)](https://appshunter.io/ios/app/simpl/id1660627978/reviews) |
| Number of ratings | **67** | 16 |
| Positive reviews | 0.0% of reviews | **40.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 weeks** |
| Monetization | Free with in-app purchases | **Free** |
| Best chart rank | **#196** | — |
| Size | 9 MB | 37 MB |
| Requires iOS | 15.0 | 15.0 |
| Devices | **iPhone, iPad, iPod, Mac** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Unbound Medicine, Inc.](https://appshunter.io/developer/300420400) | [Procedural Learning and Safety Collaborative, Inc](https://appshunter.io/developer/970265410) |

## What reviewers say

### Red Book®

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

**Currently charting:** #196 Top Grossing · Medical (US App Store)

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 |


### SIMPL

[App page](https://appshunter.io/ios/app/simpl/id1660627978)

This app facilitates workplace-based assessments for medical professionals, enabling the evaluation of entrustable professional activities within medical education settings.

**Highlights:** Workplace-based assessments, Entrustable professional activities, Medical education implementation, Professional development tracking

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

**In-app purchases:** none


## Frequently asked questions

### Is Red Book® free?

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

### Is SIMPL free?

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

### Which has better reviews, Red Book® or SIMPL?

Red Book® is rated higher. Red Book® averages 4.8 out of 5 from 67 ratings, while SIMPL averages 4.1 from 16 ratings.

### Do Red Book® or SIMPL have ads?

Neither Red Book® nor SIMPL shows ads.

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

Red Book® ships an update every 11 months, and SIMPL every 2 weeks. Most recently, Red Book® was updated on October 13, 2026 and SIMPL on October 5, 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.*