# Regional Anesthesia Reference vs Master Anesthesia

The clearest difference is in-app purchases: Regional Anesthesia Reference at none against Master Anesthesia's 7. Regional Anesthesia Reference also leads on review sentiment (89% vs 78%) and iOS requirement (8.0 vs 15.1). Master Anesthesia's advantage is update cadence (weekly vs every 5 months) and ratings volume (2K vs 32). On price, rating, ads and device support there is nothing between them.

Both are free to download. Master Anesthesia sells 7 in-app purchases, starting at $69.99 per year. Regional Anesthesia Reference asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 5.0 for Regional Anesthesia Reference against 4.9 for Master Anesthesia. That said, the two scores are not equally well evidenced: Master Anesthesia has 2K ratings behind it against 32, so its average is the more settled of the two. Written reviews are what separate them: 89% of Regional Anesthesia Reference's written reviews are positive against 78% of Master Anesthesia's.

Regional Anesthesia Reference ships an update every 5 months, Master Anesthesia weekly. The most recent releases landed on September 25, 2026 and October 13, 2026 respectively.

## The numbers

| Metric | Regional Anesthesia Reference | Master Anesthesia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (32 ratings)](https://appshunter.io/ios/app/regional-anesthesia-reference/id1445967461/reviews)** | [4.9 (2K ratings)](https://appshunter.io/ios/app/master-anesthesia/id1550793078/reviews) |
| Number of ratings | 32 | **2K** |
| Positive reviews | **88.9% of reviews** | 78.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 months | **Weekly** |
| Monetization | **Free** | Subscription |
| Best chart rank | — | **#197** |
| Size | 89 MB | 69 MB |
| Requires iOS | **8.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [University Of Washington](https://appshunter.io/developer/328228464) | [Matthew Willis](https://appshunter.io/developer/1550793080) |

## What reviewers say

### Regional Anesthesia Reference

[App page](https://appshunter.io/ios/app/regional-anesthesia-reference/id1445967461)

This app offers a quick reference for regional nerve block placement using ultrasound. It includes detailed anatomy, patient positioning, and technique videos, along with a local anesthetic drug calculator.

**Highlights:** Ultrasound guidance for nerve blocks, Anatomy and positioning guides, Block placement technique videos, Local anesthetic drug calculator, List of current blocks

**Features:** macOS Compatibility

**In-app purchases:** none


### Master Anesthesia

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

**Currently charting:** #197 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 Regional Anesthesia Reference free?

Regional Anesthesia Reference is free to download, with no in-app purchases.

### Is Master Anesthesia free?

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

### Which has better reviews, Regional Anesthesia Reference or Master Anesthesia?

Regional Anesthesia Reference is rated higher. Regional Anesthesia Reference averages 5.0 out of 5 from 32 ratings, while Master Anesthesia averages 4.9 from 2K ratings.

### Do Regional Anesthesia Reference or Master Anesthesia have ads?

Neither Regional Anesthesia Reference nor Master Anesthesia shows ads.

### Which is updated more often, Regional Anesthesia Reference or Master Anesthesia?

Regional Anesthesia Reference ships an update every 5 months, and Master Anesthesia weekly. Most recently, Regional Anesthesia Reference was updated on September 25, 2026 and Master Anesthesia on October 13, 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.*