# DOT Chart 17 vs Decon Field Guide

The clearest difference is rating: Decon Field Guide at 4.6 against DOT Chart 17's 2.3. Decon Field Guide also leads on update cadence (every 2 months vs every 10 months). DOT Chart 17's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, review sentiment, ratings volume and in-app purchases 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 2.3. Both are backed by a comparable volume of ratings — 3 and 8 respectively. Written reviews split almost evenly too, at 0% and 0% positive.

DOT Chart 17 ships an update every 10 months, Decon Field Guide every 2 months. The most recent releases landed on September 10, 2026 and June 4, 2026 respectively.

## The numbers

| Metric | DOT Chart 17 | Decon Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/dot-chart-17/id1245251292/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** |
| Number of ratings | 3 | **8** |
| Positive reviews | 0.0% of reviews | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 2 months** |
| Monetization | **Free** | Ad-supported |
| Size | 20 MB | 73 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) | [First Line Technology, LLC](https://appshunter.io/developer/1388378943) |

## What reviewers say

### DOT Chart 17

[App page](https://appshunter.io/ios/app/dot-chart-17/id1245251292)

Access a full-color display of hazardous materials markings, labels, and placards. This app provides quick visual information and regulatory citations for shippers and carriers. It serves as a general guidance tool for hazardous materials regulations.

**Highlights:** Full-color display of markings, labels, and placards, Access to Hazardous Materials Regulations (HMR) citations, Quick visual information for shippers and carriers, Mobile access to DOT Chart-17, Guidance on 49 CFR Parts 171-180

**Features:** macOS Compatibility

**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 DOT Chart 17 free?

DOT Chart 17 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.

### Which has better reviews, DOT Chart 17 or Decon Field Guide?

Decon Field Guide is rated higher. DOT Chart 17 averages 2.3 out of 5 from 3 ratings, while Decon Field Guide averages 4.6 from 8 ratings.

### Do DOT Chart 17 or Decon Field Guide have ads?

Decon Field Guide shows ads; DOT Chart 17 does not.

### Which is updated more often, DOT Chart 17 or Decon Field Guide?

DOT Chart 17 ships an update every 10 months, and Decon Field Guide every 2 months. Most recently, DOT Chart 17 was updated on September 10, 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.*