ChesHaz vs Decon Field Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
ChesHaz
Quickly identify hazardous materials using four-digit UN/NA numbers found on placards. Access chemical names and additional information offline. Links to external resources provide further details.
- Offline UN/NA number lookup
- Chemical name display
- Links to Wikipedia
- Links to NOAA information
- Educational purposes
Read full descriptionHide full description
This is a quick, free app to look up the four-digit "UN/NA" numbers on the hazmat placards affixed to highway and rail tankers. The chemical names and other information is shown. The main data is stored off-line, so it is available when there is no network connectivity. There are links to Wikipedia pages and official online information from NOAA in the US. This app was written for educational purposes only. Though this data is carefully derived from official US government web pages and is believed to be presented accurately, first responders and other life savers should probably rely on hazmat apps from official sources.
Decon Field Guide
This reference app provides quick and efficient decontamination methods for hundreds of threats. It features a classic Threat Index, pictorial instructions, and an in-app dwell timer to guide users through mission execution. Designed for approved users, it aims to make anyone an instant decontamination expert.
- Threat Index for decontamination methods
- Pictorial instructions
- In-app dwell timer
- Covers hundreds of threats
- Designed for approved users
Read full descriptionHide full description
Imagine decontamination in the palm of your hand. Introducing the all-new, redesigned Decon Field Guide. Using the same classic Threat Index, quickly and efficiently determine proper decontamination methods for hundreds of known and emerging threats and execute your mission flawlessly utilizing pictorial instructions and in-app dwell timer. Become an instant decontamination expert with the Decon Field Guide. Only available for approved users. Download now.
Screenshots
Verdict
The clearest difference is review sentiment: ChesHaz at 100% against Decon Field Guide's 0%. ChesHaz also leads on rating (5.0 vs 4.6) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and ads 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.
ChesHaz holds the better App Store score, 5.0 against 4.6. Both are backed by a comparable volume of ratings — 4 and 8 respectively. Written reviews point the same way: 100% of ChesHaz's written reviews are positive against 0% of Decon Field Guide's.
ChesHaz ships an update every 6 weeks, Decon Field Guide every 2 months. The most recent releases landed on October 7, 2026 and October 25, 2026 respectively.
| Parameter | ChesHaz | Decon Field Guide |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (4 ratings) — better | 4.6 (8 ratings) |
| Positive reviews | 100.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 | 8 — better |
| Update frequency | Every 6 weeks — better | Every 2 months |
| Ads | No | No |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 10.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 3 MB | 74 MB |
| Age rating | 4+ | 17+ |
| Developer | WIlliam Cheswick | First Line Technology |
Customer experience
ChesHaz
Decon Field Guide
In-app purchases
ChesHaz
No in-app purchases
Decon Field Guide
No in-app purchases
Questions
Is ChesHaz free?
Is Decon Field Guide free?
Which has better reviews, ChesHaz or Decon Field Guide?
Do ChesHaz or Decon Field Guide have ads?
Which is updated more often, ChesHaz or Decon Field Guide?
Other comparisons
