# Coexisting Diseases & Surgery vs Master Anesthesia

The clearest difference is price: Master Anesthesia at Free against Coexisting Diseases & Surgery's $79.99. Master Anesthesia also leads on rating (4.9 vs 4.6) and ratings volume (2K vs 29). Coexisting Diseases & Surgery's advantage is in-app purchases (none vs 7) and chart position (#18 vs #130). On review sentiment, ads and device support there is nothing between them.

Master Anesthesia is free to download; Coexisting Diseases & Surgery costs $79.99 up front. Master Anesthesia sells 7 in-app purchases, starting at $69.99 per year. Coexisting Diseases & Surgery asks for nothing beyond the download.

Master Anesthesia holds the better App Store score, 4.9 against 4.6. That said, the two scores are not equally well evidenced: Master Anesthesia has 2K ratings behind it against 29, so its average is the more settled of the two. Written reviews complicate that: 85% of Coexisting Diseases & Surgery's written reviews are positive against 78% of Master Anesthesia's, so the app with the better star average is not the one people write more warmly about.

Coexisting Diseases & Surgery ships an update monthly, Master Anesthesia weekly. Both last shipped on November 3, 2026.

## The numbers

| Metric | Coexisting Diseases & Surgery | Master Anesthesia |
| --- | --- | --- |
| Price | $79.99 | **Free** |
| Rating | [4.6 (29 ratings)](https://appshunter.io/ios/app/coexisting-diseases-and-surgery/id1543711877/reviews) | **[4.9 (2K ratings)](https://appshunter.io/ios/app/master-anesthesia/id1550793078/reviews)** |
| Number of ratings | 29 | **2K** |
| Positive reviews | **84.6% of reviews** | 78.5% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Monthly | **Weekly** |
| Monetization | **Paid** | Subscription |
| Best chart rank | **#18** | #130 |
| Size | 212 MB | 66 MB |
| Requires iOS | **13** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Vargo Anesthesia Inc](https://appshunter.io/developer/441512939) | [Matthew Willis](https://appshunter.io/developer/1550793080) |

## What reviewers say

### Coexisting Diseases & Surgery

[App page](https://appshunter.io/ios/app/coexisting-diseases-and-surgery/id1543711877)

**Currently charting:** #18 Top Paid · Medical, #67 Top Grossing · Medical (US App Store)

This medical reference app provides detailed information on common and rare diseases, including their description, etiology, diagnosis, treatment, and prognosis. It also offers guidance on managing surgical patients with coexisting conditions.

**Highlights:** Disease descriptions, Etiology and onset, Diagnosis and pathophysiology, Treatment and prognosis, Perioperative management, Disease-related surgical concerns

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

**In-app purchases:** none


### Master Anesthesia

[App page](https://appshunter.io/ios/app/master-anesthesia/id1550793078)

**Currently charting:** #130 Top Grossing · Medical (US App Store)

This app provides anesthesia professionals with quick answers to common questions. It highlights anesthetic implications of diseases, surgical cases, and drugs, and includes a searchable acronym list and a comprehensive calculator for dosages, blood loss, and fluid management.

**Highlights:** Disease anesthetic implications, Surgical case anesthetic implications, Drug anesthetic implications, Searchable acronym list, Local anesthetic dosage calculator, Blood volume and loss calculator, Fluid and equipment calculations

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

**In-app purchases (7)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Master Anesthesia Contributor | $69.99 | per year |
| Full Access CE | $449.00 | per year |
| Module Unlock | $24.99 | one-time |
| Course Unlock | $99.00 | one-time |
| Master Anesthesia One Time | $99.99 | one-time |
| One-Time | $149.99 | one-time |
| Course Unlock | $449.00 | one-time |

**What reviewers like**

- 👍 Intuitive and user-friendly interface
- 🚀 Efficient and fast calculators
- 📚 Comprehensive information and resources
- 💡 Helpful for clinical practice and preparation
- 🔍 Useful reference for anesthesia providers

**What reviewers complain about**

- 🐛 Frequent crashes and freezes in the calculations section
- 🔒 Issues with purchase verification and login
- 💰 Concerns about the transition to a paid subscription model
- 🔋 High battery consumption and performance issues on older devices

**Reported bugs**

- Incorrect terminology and credentials on the starting screen
- Inconsistent behavior when accessing content after subscription changes

**Requested features**

- Offline access to content
- Apple Watch integration for the calculator
- More detailed and up-to-date information on procedures and conditions


## Frequently asked questions

### Is Coexisting Diseases & Surgery free?

Coexisting Diseases & Surgery costs $79.99, with no in-app purchases.

### Is Master Anesthesia free?

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

### Which has better reviews, Coexisting Diseases & Surgery or Master Anesthesia?

Master Anesthesia is rated higher. Coexisting Diseases & Surgery averages 4.6 out of 5 from 29 ratings, while Master Anesthesia averages 4.9 from 2K ratings.

### Do Coexisting Diseases & Surgery or Master Anesthesia have ads?

Neither Coexisting Diseases & Surgery nor Master Anesthesia shows ads.

### Which is updated more often, Coexisting Diseases & Surgery or Master Anesthesia?

Coexisting Diseases & Surgery ships an update monthly, and Master Anesthesia weekly. Most recently, Coexisting Diseases & Surgery was updated on November 3, 2026 and Master Anesthesia on November 3, 2026.

### Which is more popular, Coexisting Diseases & Surgery or Master Anesthesia?

Coexisting Diseases & Surgery currently peaks at #18 in the App Store charts, and Master Anesthesia at #130. Chart position reflects recent download velocity rather than total install base.

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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.*