# HazChem vs Decon Field Guide

The clearest difference is update cadence: Decon Field Guide at every 2 months against HazChem's every 17 months. Decon Field Guide also leads on iOS requirement (15.1 vs 27.1). On price, ads, in-app purchases and device support there is nothing between them.

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

HazChem ships an update every 17 months, Decon Field Guide every 2 months. The most recent releases landed on October 24, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | HazChem | Decon Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** |
| Number of ratings | — | **8** |
| Positive reviews | — | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 17 months | **Every 2 months** |
| Monetization | — | Ad-supported |
| Size | 6 MB | 74 MB |
| Requires iOS | 27.1 | **15.1** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Darren Maxwell](https://appshunter.io/developer/336341197) | [First Line Technology](https://appshunter.io/developer/1388378943) |

## What reviewers say

### HazChem

[App page](https://appshunter.io/ios/app/hazchem/id645637554)

**In-app purchases:** none


### 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 HazChem free?

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

### Is Decon Field Guide free?

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

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

Neither HazChem nor Decon Field Guide shows ads.

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

HazChem ships an update every 17 months, and Decon Field Guide every 2 months. Most recently, HazChem was updated on October 24, 2026 and Decon Field Guide on October 25, 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.*