# Preop Eval vs WarfarinGuide

The clearest difference is rating: Preop Eval at 5.0 against WarfarinGuide's 3.8. WarfarinGuide's advantage is review sentiment (90% vs 67%) and iOS requirement (13.0 vs 16.6). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Preop Eval holds the better App Store score, 5.0 against 3.8. Both are backed by a comparable volume of ratings — 2 and 5 respectively. Written reviews complicate that: 67% of Preop Eval's written reviews are positive against 90% of WarfarinGuide's, so the app with the better star average is not the one people write more warmly about.

Preop Eval ships an update every 6 months, WarfarinGuide every 11 months. The most recent releases landed on September 10, 2026 and July 25, 2026 respectively.

## The numbers

| Metric | Preop Eval | WarfarinGuide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/preop-eval/id374154834/reviews)** | [3.8 (5 ratings)](https://appshunter.io/ios/app/warfaringuide/id403959804/reviews) |
| Number of ratings | 2 | **5** |
| Positive reviews | 66.7% of reviews | **90.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 6 months** | Every 11 months |
| Monetization | Free | Free |
| Size | 15 MB | 1 MB |
| Requires iOS | 16.6 | **13.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 17+ |
| Developer | [United Health Services, Inc.](https://appshunter.io/developer/1451318916) | [Joshua D. steinberg](https://appshunter.io/developer/374154837) |

## What reviewers say

### Preop Eval

[App page](https://appshunter.io/ios/app/preop-eval/id374154834)

This app provides guidance for evaluating and preparing adult patients for non-cardiac surgery. It includes algorithms and resources on medication management, cardiac event timing, and preoperative testing, serving as both a reference and a teaching tool for medical professionals.

**Highlights:** Cardiac evaluation algorithm, Medication guidance (starting/stopping), Surgery timing after cardiac events, Preoperative testing recommendations, Review for students and residents, Perioperative insulin management

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

**In-app purchases:** none


### WarfarinGuide

[App page](https://appshunter.io/ios/app/warfaringuide/id403959804)

This app provides evidence-based resources for anticoagulation management with Warfarin. It includes guidelines on indications, INR targets, and treatment duration, along with protocols for dose adjustment and initiation. It also offers guidance for peri-operative Warfarin management.

**Highlights:** Warfarin dose adjustment protocols, Warfarin initiation protocols, INR target guidelines, Peri-operative Warfarin management, ACCP guideline references, Point of care guides

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Preop Eval free?

Preop Eval is free to download, with no in-app purchases.

### Is WarfarinGuide free?

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

### Which has better reviews, Preop Eval or WarfarinGuide?

Preop Eval is rated higher. Preop Eval averages 5.0 out of 5 from 2 ratings, while WarfarinGuide averages 3.8 from 5 ratings.

### Do Preop Eval or WarfarinGuide have ads?

Neither Preop Eval nor WarfarinGuide shows ads.

### Which is updated more often, Preop Eval or WarfarinGuide?

Preop Eval ships an update every 6 months, and WarfarinGuide every 11 months. Most recently, Preop Eval was updated on September 10, 2026 and WarfarinGuide on July 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.*