# HazMat Reference vs Decon Field Guide

HazMat Reference and Decon Field Guide both sit at 4.8 stars, but that hides the real split: 96% of HazMat Reference's written reviews are positive against 0% of Decon Field Guide's. HazMat Reference also leads on ads (none vs shown) and ratings volume (1.7K vs 8). Decon Field Guide's advantage is price (Free vs $4.99). On rating, update cadence, in-app purchases and device support there is nothing between them.

Decon Field Guide is free to download; HazMat Reference costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HazMat Reference holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: HazMat Reference has 1.7K ratings behind it against 8, so its average is the more settled of the two. Written reviews point the same way: 96% of HazMat Reference's written reviews are positive against 0% of Decon Field Guide's.

HazMat Reference ships an update every 4 months, Decon Field Guide every 2 months. The most recent releases landed on September 25, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | HazMat Reference | Decon Field Guide |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.8 (1.7K ratings)](https://appshunter.io/ios/app/hazmat-reference/id385775821/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews) |
| Number of ratings | **1.7K** | 8 |
| Positive reviews | **95.9% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | **Ad-supported** |
| Best chart rank | **#89** | — |
| Size | 75 MB | 73 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 17+ |
| Developer | [ThatsMyStapler Inc.](https://appshunter.io/developer/337472637) | [First Line Technology, LLC](https://appshunter.io/developer/1388378943) |

## What reviewers say

### HazMat Reference

[App page](https://appshunter.io/ios/app/hazmat-reference/id385775821)

**Currently charting:** #89 Top Paid · Reference (US App Store)

Quickly access critical information on hazardous materials for handling, storage, and incident response. Features include advanced search, sorting, and filtering of materials from key regulatory tables and guides. Offline access ensures availability in any situation.

**Highlights:** ERG 2024 data, NIOSH, CFR/HMT, NFPA, GHS information, Advanced search, sort, and filter, Offline access, NFPA Fire Diamond, Physical descriptions and CAS#, DOT incident data filter

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

**In-app purchases:** none

**What reviewers like**

- 💡 Excellent tool
- 🚀 Saves time
- 👍 Handy app
- 👍 User-friendly
- 👍 Great resource

**What reviewers complain about**

- 🐛 Closed unexpectedly
- 🐛 Outdated information
- 👎 Color of distance pages makes it unreadable
- 👎 User interface not great

**Reported bugs**

- Bulk packaging information part of CFR 49 won't load

**Requested features**

- Format for larger phones
- Ability to print guide or reference material


### Decon Field Guide

[App page](https://appshunter.io/ios/app/decon-field-guide/id1388378944)

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.

**Highlights:** Threat Index for decontamination methods, Pictorial instructions, In-app dwell timer, Covers hundreds of threats, Designed for approved users

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HazMat Reference free?

HazMat Reference costs $4.99, with no in-app purchases.

### Is Decon Field Guide free?

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

### Which has better reviews, HazMat Reference or Decon Field Guide?

HazMat Reference is rated higher. HazMat Reference averages 4.8 out of 5 from 1.7K ratings, while Decon Field Guide averages 4.6 from 8 ratings.

### Do HazMat Reference or Decon Field Guide have ads?

Decon Field Guide shows ads; HazMat Reference does not.

### Which is updated more often, HazMat Reference or Decon Field Guide?

HazMat Reference ships an update every 4 months, and Decon Field Guide every 2 months. Most recently, HazMat Reference was updated on September 25, 2026 and Decon Field Guide on June 4, 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.*