# QS Insider vs TheHazMatApp

The clearest difference is ads: QS Insider at none against TheHazMatApp's shown. TheHazMatApp's advantage is iOS requirement (12.0 vs 18.6). On price, update cadence, 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.

QS Insider ships an update every 3 months, TheHazMatApp every 6 weeks. The most recent releases landed on September 24, 2026 and June 28, 2026 respectively.

## The numbers

| Metric | QS Insider | TheHazMatApp |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.7 (3 ratings)](https://appshunter.io/ios/app/thehazmatapp/id1527123797/reviews)** |
| Number of ratings | — | **3** |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 3 months | **Every 6 weeks** |
| Monetization | — | Ad-supported |
| Size | 52 MB | 22 MB |
| Requires iOS | 18.6 | **12.0** |
| Devices | iPhone, iPad | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [QuickSeries Publishing](https://appshunter.io/developer/369233535) | [HazClass, INC.](https://appshunter.io/developer/1495948162) |

## What reviewers say

### QS Insider

[App page](https://appshunter.io/ios/app/qs-insider/id1455973093)

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

**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 QS Insider free?

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

### Is TheHazMatApp free?

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

### Do QS Insider or TheHazMatApp have ads?

TheHazMatApp shows ads; QS Insider does not.

### Which is updated more often, QS Insider or TheHazMatApp?

QS Insider ships an update every 3 months, and TheHazMatApp every 6 weeks. Most recently, QS Insider was updated on September 24, 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.*