# CMC Field Guide vs Viance Library

The clearest difference is rating: Viance Library at 5.0 against CMC Field Guide's 4.0. CMC Field Guide's advantage is update cadence (every 3 months vs every 8 months) and ratings volume (24 vs 2). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Viance Library 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.

CMC Field Guide ships an update every 3 months, Viance Library every 8 months. The most recent releases landed on October 16, 2026 and October 10, 2026 respectively.

## The numbers

| Metric | CMC Field Guide | Viance Library |
| --- | --- | --- |
| 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/viance-library/id6739003620/reviews)** |
| Number of ratings | **24** | 2 |
| Positive reviews | 77.8% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 months** | Every 8 months |
| Monetization | Free | Free |
| Size | 36 MB | 127 MB |
| Requires iOS | 15.1 | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [CMC Rescue, Inc.](https://appshunter.io/developer/426955032) | [Viance, LLC](https://appshunter.io/developer/1783368908) |

## 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


### Viance Library

[App page](https://appshunter.io/ios/app/viance-library/id6739003620)

Access expert guidance, product literature, and environmental advantages of wood products. Get accurate material estimates and find trusted wood suppliers. Learn to identify, select, and use preservative-treated wood effectively.

**Highlights:** Interactive project guide, Material quantity and type estimates, Wood product updates and environmental advantages, Product literature access, Wood preservative information, Trusted Wood Suppliers locator, Interactive questionnaires

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

**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 Viance Library free?

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

### Which has better reviews, CMC Field Guide or Viance Library?

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

### Do CMC Field Guide or Viance Library have ads?

Neither CMC Field Guide nor Viance Library shows ads.

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

CMC Field Guide ships an update every 3 months, and Viance Library every 8 months. Most recently, CMC Field Guide was updated on October 16, 2026 and Viance Library on October 10, 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.*