# CMC Field Guide vs SDNM

The clearest difference is rating: SDNM at 4.5 against CMC Field Guide's 4.0. CMC Field Guide's advantage is ratings volume (24 vs 6). 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.

SDNM holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 24 and 6 respectively.

CMC Field Guide ships an update every 3 months, SDNM every 4 months. The most recent releases landed on June 10, 2026 and September 14, 2026 respectively.

## The numbers

| Metric | CMC Field Guide | SDNM |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (24 ratings)](https://appshunter.io/ios/app/cmc-field-guide/id426955029/reviews) | **[4.5 (6 ratings)](https://appshunter.io/ios/app/sdnm/id1491809687/reviews)** |
| Number of ratings | **24** | 6 |
| Positive reviews | 77.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 4 months |
| Monetization | Free | Free |
| Size | 36 MB | 30 MB |
| Requires iOS | **15.1** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CMC Rescue, Inc.](https://appshunter.io/developer/426955032) | [San Diego Gas & Electric](https://appshunter.io/developer/489246333) |

## 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


### SDNM

[App page](https://appshunter.io/ios/app/sdnm/id1491809687)

This app allows users to anonymously and securely report near misses or close calls. It collects details about incidents, potential injuries, and safety improvements, with automatic blurring of faces and offensive images for privacy. The app offers full offline support and synchronizes data when a connection is available.

**Highlights:** Anonymous reporting, Secure data collection, Image upload and commenting, Automatic image blurring (faces, offensive content), Offline support, Auto-synchronization, User feedback mechanism

**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 SDNM free?

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

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

SDNM is rated higher. CMC Field Guide averages 4.0 out of 5 from 24 ratings, while SDNM averages 4.5 from 6 ratings.

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

Neither CMC Field Guide nor SDNM shows ads.

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

CMC Field Guide ships an update every 3 months, and SDNM every 4 months. Most recently, CMC Field Guide was updated on June 10, 2026 and SDNM on September 14, 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.*