# CMC Field Guide vs E

The clearest difference is rating: E at 5.0 against CMC Field Guide's 4.0. E also leads on iOS requirement (13.0 vs 15.1). CMC Field Guide's advantage is ratings volume (24 vs 2). 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.

E holds the better App Store score, 5.0 against 4.0. That said, the two scores are not equally well evidenced: CMC Field Guide has 24 ratings behind it against 2, so its average is the more settled of the two.

Both ship on a similar rhythm, roughly every 3 months. The most recent releases landed on June 10, 2026 and June 11, 2026 respectively.

## The numbers

| Metric | CMC Field Guide | E |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (24 ratings)](https://appshunter.io/ios/app/cmc-field-guide/id426955029/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/e-force-sli/id6449679204/reviews)** |
| Number of ratings | **24** | 2 |
| Positive reviews | 77.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | Every 3 months |
| Monetization | Free | Free |
| Size | 36 MB | 39 MB |
| Requires iOS | 15.1 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [CMC Rescue, Inc.](https://appshunter.io/developer/426955032) | [Rescue Digital Systems GmbH](https://appshunter.io/developer/1533789837) |

## What reviewers say

### CMC Field Guide

[App page](https://appshunter.io/ios/app/cmc-field-guide/id426955029)

Access rope rescue and access diagrams, reference charts, and how-to information instantly in the field. This free app provides essential rescue references, allows for note-taking, and supports offline access to downloaded content.

**Highlights:** Rope rescue and access diagrams, Reference charts, How-to information, Bookmark and take notes, Offline access to downloads, Browse equipment and tutorials

**Features:** macOS Compatibility

**In-app purchases:** none


### E

[App page](https://appshunter.io/ios/app/e-force-sli/id6449679204)

Access all your E-FORCE SLi battery rescue tools in one place. This application from GENESIS RESCUE SYSTEMS provides essential functionalities for managing and utilizing your rescue equipment.

**Highlights:** Battery rescue tool access, E-FORCE SLi system management, GENESIS RESCUE SYSTEMS tools, Integrated functionalities

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is CMC Field Guide free?

CMC Field Guide is free to download, with no in-app purchases.

### Is E free?

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

### Which has better reviews, CMC Field Guide or E?

E is rated higher. CMC Field Guide averages 4.0 out of 5 from 24 ratings, while E averages 5.0 from 2 ratings.

### Do CMC Field Guide or E have ads?

Neither CMC Field Guide nor E shows ads.

### Which is updated more often, CMC Field Guide or E?

CMC Field Guide ships an update every 3 months, and E every 3 months. Most recently, CMC Field Guide was updated on June 10, 2026 and E on June 11, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*