# Decon Field Guide vs TheHazMatApp

The clearest difference is rating: Decon Field Guide at 4.6 against TheHazMatApp's 3.7. TheHazMatApp's advantage is iOS requirement (12.0 vs 15.1). On price, ratings volume, update cadence and ads there is nothing between them.

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

Decon Field Guide holds the better App Store score, 4.6 against 3.7. Both are backed by a comparable volume of ratings — 8 and 3 respectively.

Decon Field Guide ships an update every 2 months, TheHazMatApp every 6 weeks. The most recent releases landed on June 4, 2026 and June 28, 2026 respectively.

## The numbers

| Metric | Decon Field Guide | TheHazMatApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** | [3.7 (3 ratings)](https://appshunter.io/ios/app/thehazmatapp/id1527123797/reviews) |
| Number of ratings | **8** | 3 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | Ad-supported | Ad-supported |
| Size | 73 MB | 22 MB |
| Requires iOS | 15.1 | **12.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [First Line Technology, LLC](https://appshunter.io/developer/1388378943) | [HazClass, INC.](https://appshunter.io/developer/1495948162) |

## What reviewers say

### 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


### TheHazMatApp

[App page](https://appshunter.io/ios/app/thehazmatapp/id1527123797)

Access a comprehensive database of hazardous materials and their assigned building and fire code hazard classifications. Quickly look up chemicals by name or CAS number to determine their specific hazard status.

**Highlights:** Hazardous materials database, Building and fire code classifications, Lookup by Chemical Name, Lookup by CAS Number, Expert-assigned classifications

**In-app purchases:** none


## Frequently asked questions

### Is Decon Field Guide free?

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

### Is TheHazMatApp free?

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

### Which has better reviews, Decon Field Guide or TheHazMatApp?

Decon Field Guide is rated higher. Decon Field Guide averages 4.6 out of 5 from 8 ratings, while TheHazMatApp averages 3.7 from 3 ratings.

### Do Decon Field Guide or TheHazMatApp have ads?

Both Decon Field Guide and TheHazMatApp show ads.

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

Decon Field Guide ships an update every 2 months, and TheHazMatApp every 6 weeks. Most recently, Decon Field Guide was updated on June 4, 2026 and TheHazMatApp on June 28, 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.*