# A+PTRN vs EMS Protocol Reference

The clearest difference is device support: A+PTRN at 3 against EMS Protocol Reference's 1. A+PTRN also leads on iOS requirement (15.0 vs 18.0). On price, 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.

## The numbers

| Metric | A+PTRN | EMS Protocol Reference |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | — | Every 3 months |
| Size | 27 MB | 20 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 17+ | 17+ |
| Developer | [Acid Remap LLC](https://appshunter.io/developer/323130617) | [RespondersAI LLC](https://appshunter.io/developer/1818178681) |

## What reviewers say

### A+PTRN

[App page](https://appshunter.io/ios/app/a-plus-ptrn/id6758960658)

**Features:** macOS Compatibility

**In-app purchases:** none


### EMS Protocol Reference

[App page](https://appshunter.io/ios/app/ems-protocol-reference/id6761344731)

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

**In-app purchases:** none


## Frequently asked questions

### Is A+PTRN free?

A+PTRN is free to download, with no in-app purchases.

### Is EMS Protocol Reference free?

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

### Do A+PTRN or EMS Protocol Reference have ads?

Neither A+PTRN nor EMS Protocol Reference shows ads.

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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.*