# DOT Chart 17 vs TheHazMatApp

The clearest difference is rating: TheHazMatApp at 3.7 against DOT Chart 17's 2.3. TheHazMatApp also leads on update cadence (every 6 weeks vs every 10 months). DOT Chart 17's advantage is ads (none vs shown) and monetization model (free vs ad-supported). On price, ratings volume, 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.

TheHazMatApp holds the better App Store score, 3.7 against 2.3. Both are backed by a comparable volume of ratings — 3 and 3 respectively.

DOT Chart 17 ships an update every 10 months, TheHazMatApp every 6 weeks. The most recent releases landed on September 10, 2026 and June 28, 2026 respectively.

## The numbers

| Metric | DOT Chart 17 | TheHazMatApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.3 (3 ratings)](https://appshunter.io/ios/app/dot-chart-17/id1245251292/reviews) | **[3.7 (3 ratings)](https://appshunter.io/ios/app/thehazmatapp/id1527123797/reviews)** |
| Number of ratings | 3 | 3 |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 10 months | **Every 6 weeks** |
| Monetization | **Free** | Ad-supported |
| Size | 20 MB | 22 MB |
| Requires iOS | **11.0** | 12.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) | [HazClass, INC.](https://appshunter.io/developer/1495948162) |

## 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


### 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 DOT Chart 17 free?

DOT Chart 17 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, DOT Chart 17 or TheHazMatApp?

TheHazMatApp is rated higher. DOT Chart 17 averages 2.3 out of 5 from 3 ratings, while TheHazMatApp averages 3.7 from 3 ratings.

### Do DOT Chart 17 or TheHazMatApp have ads?

TheHazMatApp shows ads; DOT Chart 17 does not.

### Which is updated more often, DOT Chart 17 or TheHazMatApp?

DOT Chart 17 ships an update every 10 months, and TheHazMatApp every 6 weeks. Most recently, DOT Chart 17 was updated on September 10, 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.*