# Protocol Now vs ACR Guidance

The clearest difference is iOS requirement: Protocol Now at 11.0 against ACR Guidance's 15.0. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 11, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | Protocol Now | ACR Guidance |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.1 (12 ratings)](https://appshunter.io/ios/app/acr-guidance/id1484701466/reviews)** |
| Number of ratings | — | **12** |
| Positive reviews | — | 25.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | — | Free |
| Size | 15 MB | 111 MB |
| Requires iOS | **11.0** | 15.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 17+ | 17+ |
| Developer | [Protocol Now, Inc](https://appshunter.io/developer/1603125909) | [The American College of Radiology](https://appshunter.io/developer/493774954) |

## What reviewers say

### Protocol Now

[App page](https://appshunter.io/ios/app/protocol-now/id1423490534)

**Features:** macOS Compatibility

**In-app purchases:** none


### ACR Guidance

[App page](https://appshunter.io/ios/app/acr-guidance/id1484701466)

Access clinical guidance content from the ACR on your mobile device. Includes resources for contrast reactions, reporting systems, and incidental findings. Designed for healthcare professionals needing on-the-go reference materials.

**Highlights:** Interactive clinical guidance, ACR Contrast Reaction Cards, Reporting and Data Systems (RADS) content, Incidental Findings (IF) content, On-the-go reference materials

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Protocol Now free?

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

### Is ACR Guidance free?

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

### Do Protocol Now or ACR Guidance have ads?

Neither Protocol Now nor ACR Guidance shows ads.

### Which is updated more often, Protocol Now or ACR Guidance?

Protocol Now ships an update every 2 months, and ACR Guidance every 2 months. Most recently, Protocol Now was updated on October 11, 2026 and ACR Guidance on October 17, 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.*