# HazMat Reference vs Chemdata

The clearest difference is price: Chemdata at Free against HazMat Reference's $4.99. HazMat Reference's advantage is review sentiment (96% vs 67%) and update cadence (every 4 months vs every 19 months). On ads, in-app purchases, device support and iOS requirement there is nothing between them.

Chemdata is free to download; HazMat Reference costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HazMat Reference ships an update every 4 months, Chemdata every 19 months. The most recent releases landed on September 28, 2026 and June 5, 2026 respectively.

## The numbers

| Metric | HazMat Reference | Chemdata |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[4.8 (1.7K ratings)](https://appshunter.io/ios/app/hazmat-reference/id385775821/reviews)** | — |
| Number of ratings | **1.7K** | — |
| Positive reviews | **95.9% of reviews** | 66.7% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 19 months |
| Monetization | Paid | **Free** |
| Best chart rank | **#37** | — |
| Size | 75 MB | 49 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [ThatsMyStapler Inc.](https://appshunter.io/developer/337472637) | [Ricardo-AEA ltd](https://appshunter.io/developer/691094634) |

## What reviewers say

### HazMat Reference

[App page](https://appshunter.io/ios/app/hazmat-reference/id385775821)

**Currently charting:** #37 Top Paid · Reference (US App Store)

Quickly access critical information on hazardous materials for handling, storage, and incident response. Features include advanced search, sorting, and filtering of materials from key regulatory tables and guides. Offline access ensures availability in any situation.

**Highlights:** ERG 2024 data, NIOSH, CFR/HMT, NFPA, GHS information, Advanced search, sort, and filter, Offline access, NFPA Fire Diamond, Physical descriptions and CAS#, DOT incident data filter

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

**In-app purchases:** none

**What reviewers like**

- 💡 Excellent tool
- 🚀 Saves time
- 👍 Handy app
- 👍 User-friendly
- 👍 Great resource

**What reviewers complain about**

- 🐛 Closed unexpectedly
- 🐛 Outdated information
- 👎 Color of distance pages makes it unreadable
- 👎 User interface not great

**Reported bugs**

- Bulk packaging information part of CFR 49 won't load

**Requested features**

- Format for larger phones
- Ability to print guide or reference material


### Chemdata

[App page](https://appshunter.io/ios/app/chemdata/id849758854)

Access a comprehensive chemical hazard database offline for incident management. Provides detailed information on over 62,000 chemicals, including safety, transport, and emergency response guidance. Offers multilingual support and regular updates.

**Highlights:** Offline chemical database access, Hazardous chemical identification, Incident command support, Transport classification, Personal Protective Equipment (PPE) guidance, Multilingual support (EN, NL, FR, DE, ES)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HazMat Reference free?

HazMat Reference costs $4.99, with no in-app purchases.

### Is Chemdata free?

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

### Do HazMat Reference or Chemdata have ads?

Neither HazMat Reference nor Chemdata shows ads.

### Which is updated more often, HazMat Reference or Chemdata?

HazMat Reference ships an update every 4 months, and Chemdata every 19 months. Most recently, HazMat Reference was updated on September 28, 2026 and Chemdata on June 5, 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.*