# MSD E vs Preop360

The clearest difference is in-app purchases: MSD E at none against Preop360's 1. MSD E also leads on update cadence (every 5 weeks vs every 5 months) and iOS requirement (11.0 vs 15.1). On price, ads and device support there is nothing between them.

Both are free to download. Preop360 sells 1 in-app purchase, starting at $4.99 per month. MSD E asks for nothing beyond the download.

MSD E ships an update every 5 weeks, Preop360 every 5 months. The most recent releases landed on September 18, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | MSD E | Preop360 |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/preop360/id6746079405/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | **Every 5 weeks** | Every 5 months |
| Monetization | — | Free with in-app purchases |
| Size | 45 MB | 40 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Deverhood HT Co.,Ltd.](https://appshunter.io/developer/1785579550) | [CARE DECISIONS LLC](https://appshunter.io/developer/1734179704) |

## What reviewers say

### MSD E

[App page](https://appshunter.io/ios/app/msd-e-logbook/id6502573447)

**Features:** macOS Compatibility

**In-app purchases:** none


### Preop360

[App page](https://appshunter.io/ios/app/preop360/id6746079405)

This app provides evidence-based support for clinicians evaluating adult patients for noncardiac surgery. It incorporates patient comorbidities and medications with interactive calculators to assess perioperative risk. Direct links to references and explanations aid in decision-making and learning.

**Highlights:** Evidence-based preoperative assessment, Interactive risk calculators (RCRI, DASI), Incorporates comorbidities and medications, Links to key references and explanations, Streamlines patient preparation, Standardizes assessments

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Basic Plan | $4.99 | per month |


## Frequently asked questions

### Is MSD E free?

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

### Is Preop360 free?

Preop360 is free to download, with in-app purchases available.

### Do MSD E or Preop360 have ads?

Neither MSD E nor Preop360 shows ads.

### Which is updated more often, MSD E or Preop360?

MSD E ships an update every 5 weeks, and Preop360 every 5 months. Most recently, MSD E was updated on September 18, 2026 and Preop360 on July 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.*