CMC Field Guide vs Viance Library
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
CMC Field Guide
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.
- Rope rescue and access diagrams
- Reference charts
- How-to information
- Bookmark and take notes
- Offline access to downloads
- Browse equipment and tutorials
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This free App allows quick access to rope rescue and access diagrams, reference charts, how-to information, and rescue references, all from the palm of your hand while out in the field. It's packed with reference charts, diagrams, and how-to information. With the CMC Field Guide App you can: Access rescue references instantly Bookmark and take notes on your favorite sections Download videos, guides, and manuals for offline use Browse equipment and information, tutorials, and product user manuals **Note** Updating this App will give you access to all of the functionality built into the most recent version of the App. Your saved information including Notes, References, and Attachments, will be carried through into the updated version.
Viance Library
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.
- 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
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Access expert guidance, helpful tips, and recommendations for treaters and users of all experience levels through our interactive project guide. Receive accurate estimates for material quantities and types — customized to fit your specific project needs. The Viance Library app is your go-to resource to stay informed with the latest updates on wood products and their environmental advantages. Access the most recent product's literature, providing you with the information you need, anytime and anywhere. This app will give you quick access to our product specs and informational documents for residential, commercial, utility and industrial preservatives. Learn how to extend the lifespan of wood. It also provides a Trusted Wood Suppliers locator to help you find the closest one to you. Discover all you need to know about identifying, selecting, and using preservative-treated wood through the interactive questionnaires inside the app, designed to guide you in identifying the most relevant products and documents for your specific needs, ensuring you get the right information. Get the info you need, exactly when you need it on the job site. The document library in our mobile app gives you access to hundreds of product specs. Just grab your phone, search, and get back to work without missing a beat.
Screenshots
Verdict
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.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
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.
| Parameter | CMC Field Guide | Viance Library |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (24 ratings) | 5.0 (2 ratings) — better |
| Positive reviews | 77.8% of reviews | — |
| Number of ratings | 24 — better | 2 |
| Update frequency | Every 3 months — better | Every 8 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free | Free |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 15.1 |
| Further details — not scored | ||
| Size | 36 MB | 127 MB |
| Age rating | 4+ | 4+ |
| Developer | CMC Rescue, Inc. | Viance, LLC |
Customer experience
CMC Field Guide
Viance Library
Bugs and requests
CMC Field Guide
Reported bugs
15 issues- 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
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- Multiple glitches where pages cannot be opened
- Cannot open the app after update
- New upgrade crashes on opening items
- Could not find page all the time
- App doesn't open
- Half the tabs disappear
- Barely works (can rarely get into any of the pages)
- Add-on pop up when viewing PDF
- Poor display quality - not useful for reading
- Only M/A illustration shown is 1:1 after update
Requested features
2 requests- Enable landscape mode
- Update with latest techniques
Viance Library
Not enough reviews yet to summarise bugs or requests.
In-app purchases
CMC Field Guide
No in-app purchases
Viance Library
No in-app purchases
Questions
Is CMC Field Guide free?
Is Viance Library free?
Which has better reviews, CMC Field Guide or Viance Library?
Do CMC Field Guide or Viance Library have ads?
Which is updated more often, CMC Field Guide or Viance Library?
Other comparisons
