# HazMat Reference vs DRR Rescue

The clearest difference is price: HazMat Reference at $4.99 against DRR Rescue's $19.99. HazMat Reference also leads on update cadence (every 4 months vs every 12 months) and ratings volume (1.7K vs 518). On rating, review sentiment, ads and in-app purchases there is nothing between them.

HazMat Reference costs $4.99 and DRR Rescue $19.99 up front. Neither carries in-app purchases, so what you see is what you pay.

On the App Store both sit at effectively the same score — 4.8 for HazMat Reference against 4.9 for DRR Rescue. Both are backed by a comparable volume of ratings — 1.7K and 518 respectively. Written reviews are what separate them: 96% of HazMat Reference's written reviews are positive against 93% of DRR Rescue's.

HazMat Reference ships an update every 4 months, DRR Rescue every 12 months. The most recent releases landed on September 25, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | HazMat Reference | DRR Rescue |
| --- | --- | --- |
| Price | **$4.99** | $19.99 |
| Rating | [4.8 (1.7K ratings)](https://appshunter.io/ios/app/hazmat-reference/id385775821/reviews) | **[4.9 (518 ratings)](https://appshunter.io/ios/app/drr-rescue/id570611259/reviews)** |
| Number of ratings | **1.7K** | 518 |
| Positive reviews | **95.9% of reviews** | 93.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 months** | Every 12 months |
| Monetization | Paid | Paid |
| Best chart rank | #92 | **#32** |
| Size | 75 MB | 171 MB |
| Requires iOS | **14.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 4+ |
| Developer | [ThatsMyStapler Inc.](https://appshunter.io/developer/337472637) | [Tom PENDLEY](https://appshunter.io/developer/570611262) |

## What reviewers say

### HazMat Reference

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

**Currently charting:** #92 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


### DRR Rescue

[App page](https://appshunter.io/ios/app/drr-rescue/id570611259)

**Currently charting:** #32 Top Paid · Reference (US App Store)

This app provides a digital, multimedia field operations guide for urban technical rescue. It offers illustrated procedures, video tutorials, and specialized calculators for shoring and trenching. Interactive checklists and standard-level indicators enhance training and operational efficiency for rescuers.

**Highlights:** Illustrated rescue procedures, Video tutorials, Shoring calculators, Trench calculators, Interactive command checklists, Standard level indicators

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

**In-app purchases:** none

**What reviewers like**

- 👍 Extremely easy to use and navigate
- 📚 Comprehensive technical rescue content covering multiple disciplines
- 🔄 Regularly updated with current material and standards
- 📱 Convenient pocket reference on mobile device
- 🎯 Practical field-tested information from industry experts

**What reviewers complain about**

- 💧 Moisture exposure risk compared to laminated physical guides
- 🔌 Requires device to be charged for use
- 📹 Video content limited or incomplete
- ⚠️ Platform-specific issues (iPad video download problems)
- 🔗 Redirects to external video content unexpectedly

**Reported bugs**

- App crashes on startup or during use
- Text unreadable or display glitches
- Calculator functionality not working
- Video downloads cause app to close (iPad)
- Unexpected redirects to external video content

**Requested features**

- User notes section for personal annotations
- Metric measurements (metres) in addition to imperial
- More comprehensive video tutorial library
- Improved video streaming and download functionality


## Frequently asked questions

### Is HazMat Reference free?

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

### Is DRR Rescue free?

DRR Rescue costs $19.99, with no in-app purchases.

### Which has better reviews, HazMat Reference or DRR Rescue?

DRR Rescue is rated higher. HazMat Reference averages 4.8 out of 5 from 1.7K ratings, while DRR Rescue averages 4.9 from 518 ratings.

### Do HazMat Reference or DRR Rescue have ads?

Neither HazMat Reference nor DRR Rescue shows ads.

### Which is updated more often, HazMat Reference or DRR Rescue?

HazMat Reference ships an update every 4 months, and DRR Rescue every 12 months. Most recently, HazMat Reference was updated on September 25, 2026 and DRR Rescue on September 24, 2026.

### Which is more popular, HazMat Reference or DRR Rescue?

HazMat Reference currently peaks at #92 in the App Store charts, and DRR Rescue at #32. Chart position reflects recent download velocity rather than total install base.

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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.*