# ASRA Coags vs Master Anesthesia

The clearest difference is review sentiment: Master Anesthesia at 79% against ASRA Coags's 10%. Master Anesthesia also leads on rating (4.9 vs 1.3) and update cadence (every 6 days vs every 3 months). ASRA Coags's advantage is in-app purchases (none vs 7) and iOS requirement (13.4 vs 15.1). On price, ads, monetization model 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. ASRA Coags asks for nothing beyond the download.

Master Anesthesia holds the better App Store score, 4.9 against 1.3. Both are backed by a comparable volume of ratings — 407 and 2K respectively. Written reviews point the same way: 10% of ASRA Coags's written reviews are positive against 79% of Master Anesthesia's.

ASRA Coags ships an update every 3 months, Master Anesthesia every 6 days. The most recent releases landed on September 21, 2026 and September 25, 2026 respectively.

## The numbers

| Metric | ASRA Coags | Master Anesthesia |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.3 (407 ratings)](https://appshunter.io/ios/app/asra-coags/id858796572/reviews) | **[4.9 (2K ratings)](https://appshunter.io/ios/app/master-anesthesia/id1550793078/reviews)** |
| Number of ratings | 407 | **2K** |
| Positive reviews | 9.7% of reviews | **79.1% of reviews** |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 6 days** |
| Monetization | Subscription | Subscription |
| Best chart rank | — | **#152** |
| Size | 27 MB | 69 MB |
| Requires iOS | **13.4** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 17+ | 12+ |
| Developer | [American Society of Regional Anesthesia and Pain Medicine](https://appshunter.io/developer/858796575) | [Matthew Willis](https://appshunter.io/developer/1550793080) |

## What reviewers say

### ASRA Coags

[App page](https://appshunter.io/ios/app/asra-coags/id858796572)

This app provides quick access to anticoagulation guidelines for regional anesthesia and interventional pain procedures. It offers drug-specific summaries, recommendations based on procedure type, and detailed information on medication mechanisms and guideline documents.

**Highlights:** Anticoagulation guideline reference, Drug-specific summary information, Regional anesthesia guidelines, Interventional pain guidelines, Search by drug or procedure, Recommendations by block and intervention type

**Features:** Apple Wallet, Vision Pro support

**In-app purchases:** none


### Master Anesthesia

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

**Currently charting:** #152 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 ASRA Coags free?

ASRA Coags 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, ASRA Coags or Master Anesthesia?

Master Anesthesia is rated higher. ASRA Coags averages 1.3 out of 5 from 407 ratings, while Master Anesthesia averages 4.9 from 2K ratings.

### Do ASRA Coags or Master Anesthesia have ads?

Neither ASRA Coags nor Master Anesthesia shows ads.

### Which is updated more often, ASRA Coags or Master Anesthesia?

ASRA Coags ships an update every 3 months, and Master Anesthesia every 6 days. Most recently, ASRA Coags was updated on September 21, 2026 and Master Anesthesia on September 25, 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.*