# CPS by CPhA vs The Ottawa Rules

The clearest difference is review sentiment: The Ottawa Rules at 100% against CPS by CPhA's 13%. The Ottawa Rules also leads on rating (5.0 vs 1.0) and monetization model (free vs subscription). 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.

The Ottawa Rules holds the better App Store score, 5.0 against 1.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively. Written reviews point the same way: 13% of CPS by CPhA's written reviews are positive against 100% of The Ottawa Rules's.

CPS by CPhA ships an update every 4 months, The Ottawa Rules every 2 months. The most recent releases landed on October 17, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | CPS by CPhA | The Ottawa Rules |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [1.0 (2 ratings)](https://appshunter.io/ios/app/cps-by-cpha/id428293181/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/the-ottawa-rules/id1104004722/reviews)** |
| Number of ratings | 2 | 2 |
| Positive reviews | 13.1% of reviews | **100.0% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Subscription | **Free** |
| Size | 177 MB | 155 MB |
| Requires iOS | 14.2 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 12+ |
| Developer | [Canadian Pharmacists Association (CPhA)](https://appshunter.io/developer/1373388211) | [Ottawa Hospital Research Institute](https://appshunter.io/developer/574951918) |

## What reviewers say

### CPS by CPhA

[App page](https://appshunter.io/ios/app/cps-by-cpha/id428293181)

Access essential, evidence-based drug information for healthcare professionals. Choose between drug monographs or full access with therapeutic guidance and tools. Stay updated with critical warnings and advisories.

**Highlights:** Evidence-based drug monographs, Therapeutic information, Non-prescription therapy guidance, Drug tables and algorithms, Medical calculators, Critical updates and warnings

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

**In-app purchases:** none


### The Ottawa Rules

[App page](https://appshunter.io/ios/app/the-ottawa-rules/id1104004722)

This app provides accessible clinical decision rules developed by researchers to help healthcare professionals make informed choices. It aims to reduce unnecessary diagnostic imaging and emergency room wait times, improving patient comfort and healthcare costs.

**Highlights:** Accessible clinical decision rules, Reduces unnecessary imaging, Decreases ER wait times, Enhances patient comfort, Lowers healthcare costs

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CPS by CPhA free?

CPS by CPhA is free to download, with no in-app purchases.

### Is The Ottawa Rules free?

The Ottawa Rules is free to download, with no in-app purchases.

### Which has better reviews, CPS by CPhA or The Ottawa Rules?

The Ottawa Rules is rated higher. CPS by CPhA averages 1.0 out of 5 from 2 ratings, while The Ottawa Rules averages 5.0 from 2 ratings.

### Do CPS by CPhA or The Ottawa Rules have ads?

Neither CPS by CPhA nor The Ottawa Rules shows ads.

### Which is updated more often, CPS by CPhA or The Ottawa Rules?

CPS by CPhA ships an update every 4 months, and The Ottawa Rules every 2 months. Most recently, CPS by CPhA was updated on October 17, 2026 and The Ottawa Rules on October 9, 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.*