# Master Anesthesia vs Periop Pacemaker

The clearest difference is monetization model: Periop Pacemaker at free with in-app purchases against Master Anesthesia's subscription. Periop Pacemaker also leads on review sentiment (100% vs 78%) and iOS requirement (13.0 vs 15.1). Master Anesthesia's advantage is update cadence (weekly vs every 2 months) and ratings volume (2K vs 8). On price, rating, ads and in-app purchases there is nothing between them.

Both are free to download. Master Anesthesia sells 7 in-app purchases, starting at $69.99 per year and Periop Pacemaker sells 2 in-app purchases, starting at $2.99 per year. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.9 for Master Anesthesia against 5.0 for Periop Pacemaker. That said, the two scores are not equally well evidenced: Master Anesthesia has 2K ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 78% of Master Anesthesia's written reviews are positive against 100% of Periop Pacemaker's.

Master Anesthesia ships an update weekly, Periop Pacemaker every 2 months. The most recent releases landed on October 15, 2026 and September 27, 2026 respectively.

## The numbers

| Metric | Master Anesthesia | Periop Pacemaker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.9 (2K ratings)](https://appshunter.io/ios/app/master-anesthesia/id1550793078/reviews) | **[5.0 (8 ratings)](https://appshunter.io/ios/app/periop-pacemaker/id6615070538/reviews)** |
| Number of ratings | **2K** | 8 |
| Positive reviews | 78.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Weekly** | Every 2 months |
| Monetization | Subscription | **Free with in-app purchases** |
| Best chart rank | **#142** | — |
| Size | 69 MB | 43 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 12+ | 17+ |
| Developer | [Matthew Willis](https://appshunter.io/developer/1550793080) | [Rhythm Management, LLC](https://appshunter.io/developer/1761518402) |

## What reviewers say

### Master Anesthesia

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

**Currently charting:** #142 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


### Periop Pacemaker

[App page](https://appshunter.io/ios/app/periop-pacemaker/id6615070538)

This app provides medical professionals with a decision algorithm for managing surgical patients with implantable defibrillators or pacemakers. It is based on guidelines endorsed by the Heart Rhythm Society and updated annually by an expert committee.

**Highlights:** Decision algorithm for pacemaker/defibrillator management, Endorsed by Heart Rhythm Society, Based on ASA Perioperative Cardiac Implantable Electronic Device Management Aid, Annual expert committee updates, Designed for medical professionals

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| PERIOP PACEMAKER ANNUAL FEE | $2.99 | per year |
| Periop Pacemaker | $7.99 | one-time |


## Frequently asked questions

### Is Master Anesthesia free?

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

### Is Periop Pacemaker free?

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

### Which has better reviews, Master Anesthesia or Periop Pacemaker?

Periop Pacemaker is rated higher. Master Anesthesia averages 4.9 out of 5 from 2K ratings, while Periop Pacemaker averages 5.0 from 8 ratings.

### Do Master Anesthesia or Periop Pacemaker have ads?

Neither Master Anesthesia nor Periop Pacemaker shows ads.

### Which is updated more often, Master Anesthesia or Periop Pacemaker?

Master Anesthesia ships an update weekly, and Periop Pacemaker every 2 months. Most recently, Master Anesthesia was updated on October 15, 2026 and Periop Pacemaker on September 27, 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.*