# Preop Eval vs Opioid Tool

The clearest difference is rating: Preop Eval at 5.0 against Opioid Tool's 3.6. Preop Eval also leads on review sentiment (67% vs 40%). Opioid Tool's advantage is update cadence (every 5 days vs every 6 months) and ratings volume (8 vs 2). On price, ads, in-app purchases and monetization model 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 3.6. Both are backed by a comparable volume of ratings — 2 and 8 respectively. Written reviews point the same way: 67% of Preop Eval's written reviews are positive against 40% of Opioid Tool's.

Preop Eval ships an update every 6 months, Opioid Tool every 5 days. Both last shipped on September 10, 2026.

## The numbers

| Metric | Preop Eval | Opioid Tool |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (2 ratings)](https://appshunter.io/ios/app/preop-eval/id374154834/reviews)** | [3.6 (8 ratings)](https://appshunter.io/ios/app/opioid-tool/id827561557/reviews) |
| Number of ratings | 2 | **8** |
| Positive reviews | **66.7% of reviews** | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 5 days** |
| Monetization | Free | Free |
| Size | 15 MB | 1 MB |
| Requires iOS | 16.6 | **7.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [United Health Services, Inc.](https://appshunter.io/developer/1451318916) | [aaron sobol](https://appshunter.io/developer/358992561) |

## 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


### Opioid Tool

[App page](https://appshunter.io/ios/app/opioid-tool/id827561557)

This medical app provides tools for healthcare professionals rotating through specific rotations. It includes an opioid conversion calculator, a 30-day refill calculator, and a reference for opioid metabolites. A prescribing checklist is also available to aid in patient care.

**Highlights:** Opioid conversion calculator, 30-day refill calculator, Opioid metabolite reference, Prescribing checklist

**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 Opioid Tool free?

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

### Which has better reviews, Preop Eval or Opioid Tool?

Preop Eval is rated higher. Preop Eval averages 5.0 out of 5 from 2 ratings, while Opioid Tool averages 3.6 from 8 ratings.

### Do Preop Eval or Opioid Tool have ads?

Neither Preop Eval nor Opioid Tool shows ads.

### Which is updated more often, Preop Eval or Opioid Tool?

Preop Eval ships an update every 6 months, and Opioid Tool every 5 days. Most recently, Preop Eval was updated on September 10, 2026 and Opioid Tool on September 10, 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.*