# HazMat Reference vs Lost Person Behavior

The clearest difference is rating: HazMat Reference at 4.8 against Lost Person Behavior's 4.2. HazMat Reference also leads on ratings volume (1.7K vs 13) and review sentiment (96% vs 71%). Lost Person Behavior's advantage is iOS requirement (9.0 vs 14.0). On update cadence, ads, in-app purchases and monetization model there is nothing between them.

HazMat Reference costs $4.99 and Lost Person Behavior $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

HazMat Reference holds the better App Store score, 4.8 against 4.2. That said, the two scores are not equally well evidenced: HazMat Reference has 1.7K ratings behind it against 13, so its average is the more settled of the two. Written reviews point the same way: 96% of HazMat Reference's written reviews are positive against 71% of Lost Person Behavior's.

HazMat Reference ships an update every 4 months, Lost Person Behavior every 2 months. The most recent releases landed on October 13, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | HazMat Reference | Lost Person Behavior |
| --- | --- | --- |
| Price | **$4.99** | $9.99 |
| Rating | **[4.8 (1.7K ratings)](https://appshunter.io/ios/app/hazmat-reference/id385775821/reviews)** | [4.2 (13 ratings)](https://appshunter.io/ios/app/lost-person-behavior/id958063238/reviews) |
| Number of ratings | **1.7K** | 13 |
| Positive reviews | **95.9% of reviews** | 71.4% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 4 months | **Every 2 months** |
| Monetization | Paid | Paid |
| Best chart rank | #27 | **#20** |
| Size | 75 MB | 11 MB |
| Requires iOS | 14.0 | **9.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 12+ | 12+ |
| Developer | [ThatsMyStapler Inc.](https://appshunter.io/developer/337472637) | [dbS Productions](https://appshunter.io/developer/958063237) |

## What reviewers say

### HazMat Reference

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

**Currently charting:** #27 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


### Lost Person Behavior

[App page](https://appshunter.io/ios/app/lost-person-behavior/id958063238)

**Currently charting:** #20 Top Paid · Reference (US App Store)

This app provides critical information for search and rescue operations, guiding officials on where to look for missing persons. It offers detailed behavioral profiles, tactical briefings, and investigative questions tailored to 41 subject categories. The app functions offline, making it reliable in remote locations.

**Highlights:** 41 subject categories, Subject category wizard, Behavioral profiles, Tactical briefings, Investigative questions, Spatial and survival statistics, Offline functionality

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

**In-app purchases:** none


## Frequently asked questions

### Is HazMat Reference free?

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

### Is Lost Person Behavior free?

Lost Person Behavior costs $9.99, with no in-app purchases.

### Which has better reviews, HazMat Reference or Lost Person Behavior?

HazMat Reference is rated higher. HazMat Reference averages 4.8 out of 5 from 1.7K ratings, while Lost Person Behavior averages 4.2 from 13 ratings.

### Do HazMat Reference or Lost Person Behavior have ads?

Neither HazMat Reference nor Lost Person Behavior shows ads.

### Which is updated more often, HazMat Reference or Lost Person Behavior?

HazMat Reference ships an update every 4 months, and Lost Person Behavior every 2 months. Most recently, HazMat Reference was updated on October 13, 2026 and Lost Person Behavior on October 8, 2026.

### Which is more popular, HazMat Reference or Lost Person Behavior?

HazMat Reference currently peaks at #27 in the App Store charts, and Lost Person Behavior at #20. 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.*