# CMC Field Guide vs iSpyMobile

The clearest difference is review sentiment: CMC Field Guide at 77% against iSpyMobile's 32%. CMC Field Guide also leads on rating (4.0 vs 2.8) and monetization model (free vs freemium). iSpyMobile's advantage is update cadence (every 3 weeks vs every 3 months). On price, ratings volume, 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.

CMC Field Guide holds the better App Store score, 4.0 against 2.8. Both are backed by a comparable volume of ratings — 24 and 30 respectively. Written reviews point the same way: 77% of CMC Field Guide's written reviews are positive against 32% of iSpyMobile's.

CMC Field Guide ships an update every 3 months, iSpyMobile every 3 weeks. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | CMC Field Guide | iSpyMobile |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.0 (24 ratings)](https://appshunter.io/ios/app/cmc-field-guide/id426955029/reviews)** | [2.8 (30 ratings)](https://appshunter.io/ios/app/ispymobile/id697974997/reviews) |
| Number of ratings | 24 | **30** |
| Positive reviews | **77.0% of reviews** | 31.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 3 weeks** |
| Monetization | **Free** | Freemium |
| Size | 36 MB | 376 MB |
| Requires iOS | **15.1** | 15.4 |
| Devices | iPhone, iPad, iPod | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [CMC Rescue, Inc.](https://appshunter.io/developer/426955032) | [iSpyFire, Inc.](https://appshunter.io/developer/1193672675) |

## 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

**What reviewers like**

- 👍 Great resource for rescue
- 👍 Useful for knots
- 👍 Informative and well-organized
- 👍 Handy reference tool
- 👍 Clear illustrations

**What reviewers complain about**

- 🐛 App crashes frequently
- 🐛 Unable to access content after updates
- 🐛 Glitches and bugs
- 🐛 Poor display quality
- 🐛 Not working on iPad

**Reported bugs**

- App crashes before it opens
- Unable to go beyond the first page
- Unable to access after updating
- App crashed twice
- Some links in the app don't work

**Requested features**

- Enable landscape mode
- Update with latest techniques


### iSpyMobile

[App page](https://appshunter.io/ios/app/ispymobile/id697974997)

This application provides first responders with live, constantly updating data and information crucial for emergency response success. It offers flexible technology for fire, police, and EMS agencies, delivering real-time call notifications, locations, and mapping.

**Highlights:** Call notification, Call information, Call location, Map layers, Address history, Directions, Apparatus-specific features

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none

**What reviewers like**

- 🗺️ Excellent map overlay with multiple layers
- ⚡ Fast and snappy routing
- 📊 Reliable radio logs and unit times
- 🔄 Replaces CAD functionality effectively
- 👥 Responsive development team addressing issues

**What reviewers complain about**

- 🐛 Frequent crashes and force closures
- ⏱️ Slow loading times for calls and information
- 🔔 Unreliable notification delivery
- 📵 Notifications bypass disable settings
- 🎨 Poor UI redesign in version 2.0

**Reported bugs**

- App crashes when opening native maps
- Notifications don't respect disable settings
- Closed calls not displaying despite toggle enabled
- Calls not loading or showing as zero calls
- App force closes when accessing notifications from lock screen

**Requested features**

- Revert to previous app version design
- Adjustable text size controls
- Dark mode toggle option
- Google Maps integration option
- Persistent notification settings


## Frequently asked questions

### Is CMC Field Guide free?

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

### Is iSpyMobile free?

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

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

CMC Field Guide is rated higher. CMC Field Guide averages 4.0 out of 5 from 24 ratings, while iSpyMobile averages 2.8 from 30 ratings.

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

Neither CMC Field Guide nor iSpyMobile shows ads.

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

CMC Field Guide ships an update every 3 months, and iSpyMobile every 3 weeks. Most recently, CMC Field Guide was updated on October 6, 2026 and iSpyMobile on October 8, 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.*