# ESF#3 Field Guide vs ARS FOG

The clearest difference is price: ESF#3 Field Guide at Free against ARS FOG's $9.99. ESF#3 Field Guide also leads on iOS requirement (16.4 vs 18.2). ARS FOG's advantage is chart position (#25 vs unranked). On ads, in-app purchases and device support there is nothing between them.

ESF#3 Field Guide is free to download; ARS FOG costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | ESF#3 Field Guide | ARS FOG |
| --- | --- | --- |
| Price | **Free** | $9.99 |
| Rating | — | **[5.0 (12 ratings)](https://appshunter.io/ios/app/ars-fog/id6761950939/reviews)** |
| Number of ratings | — | **12** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 weeks | — |
| Monetization | — | Paid |
| Best chart rank | — | **#25** |
| Size | 98 MB | 68 MB |
| Requires iOS | **16.4** | 18.2 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Donald Schlack](https://appshunter.io/developer/1403171629) | [Advanced Rescue Solutions](https://appshunter.io/developer/1892172710) |

## What reviewers say

### ESF#3 Field Guide

[App page](https://appshunter.io/ios/app/esf3-field-guide/id1632993581)

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

**In-app purchases:** none


### ARS FOG

[App page](https://appshunter.io/ios/app/ars-fog/id6761950939)

**Currently charting:** #25 Top Paid · Reference (US App Store)

This technical rescue field guide provides essential reference material and calculators for emergency operations. Access over 250 pages of content on topics like structural collapse and rope systems, along with over 20 specialized calculators for field use.

**Highlights:** Comprehensive field guide with 250+ pages, Full-text search and table of contents, 20+ purpose-built technical rescue calculators, Cross-referencing between guides and calculators, Quick-access emergency contacts and resources

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

**In-app purchases:** none


## Frequently asked questions

### Is ESF#3 Field Guide free?

ESF#3 Field Guide is free to download, with no in-app purchases.

### Is ARS FOG free?

ARS FOG costs $9.99, with no in-app purchases.

### Do ESF#3 Field Guide or ARS FOG have ads?

Neither ESF#3 Field Guide nor ARS FOG 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.*