Comparison

HazMat Reference vs Hazmat Registration Search

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HazMat Reference

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
Currently charting
Read full description

Your best quick reference for hazardous materials. Includes: NIOSH, CFR/HMT, NFPA, GHS, CAMEO information. This app serves as a quick reference and educational tool for employees that are involved with the regular handling and storage or incident response of Hazardous Materials. Materials from the Hazardous Material Table (HMT) and Emergency Response Guidebook (ERG) are listed in easy to review form with advanced search, sort, and filter capabilities. Pertinent information from the HMT, ERG, NIOSH and other sources are listed with the proper placard and hazard class for each material. The Hazardous Materials Table (HMT) 49 CFR §172.101 is a list of hazardous materials by proper shipping name that governs the transportation, marking and labeling by all modes: air, water, rail, and highway. Understanding and knowing how to use information in the HMT is the first step toward compliance. The Emergency Response Guidebook (ERG) is primarily a guide to aid first responders in quickly identifying the specific or generic hazards of the material(s) involved in the incident, and protecting themselves and the general public during the initial response phase of the incident. The ERG is updated and released every 4 years by the D.O.T. No internet connection required. Find materials by name or UN Identifier. Includes information from all tables and reference pages in the ERG. Additional Features: * Filter/Sort Materials with DOT Reported Incidents in the last 12 months * History of materials - most recent or most viewed * NFPA Fire Diamond: quick visual ref for Health, Fire, Reactivity, and other hazards * Physical descriptions for most chemicals * CAS#, RTECS# with NIOSH IDLH and exposure information * Quicksort by UN ID#, guide #, name or number of incidents

About

Hazmat Registration Search

Easily check the status of hazmat registrations for companies. Search by registration ID, USDOT number, postal code, or company name. Generate and share PDF certificates of registration.

Highlights
  • Search hazmat registration database
  • Basic and advanced search options
  • Search by registration ID, USDOT #, postal code, company name
  • View company registration details
  • Generate PDF registration certificates
  • Save or email certificates
Features
Read full description

The Hazmat Registration Search mobile app allows you to search the US Department of Transportation’s Hazmat Registration database to determine the status of a company’s hazmat registration. Basic and advanced search functions allow you to search using registration ID, USDOT #, postal code and/or company name. The basic search function provides one field to enter a search value and can return a list of many results. The advanced search function provides multiple fields to enter search values and can return a shorter refined list of results. Once a search is performed, a list of companies is returned. By selecting a company, you can expand the details of a specific hazmat registration record. A PDF function allows you to generate a PDF version of the Hazmat Registration certificate that can be printed, saved or emailed. The web based version of this application can be accessed at https://portal.phmsa.dot.gov/HazmatRegistrationSearch.

Screenshots

HazMat Reference4 screens
Hazmat Registration Search4 screens

Verdict

The call

The clearest difference is price: Hazmat Registration Search at Free against HazMat Reference's $4.99. Hazmat Registration Search also leads on iOS requirement (11.0 vs 14.0). HazMat Reference's advantage is ratings volume (1.8K vs 2) and chart position (#25 vs unranked). On rating, update cadence, ads and in-app purchases there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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

ReceptionRating · Positive reviews · Number of ratings

Hazmat Registration Search holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: HazMat Reference has 1.8K ratings behind it against 2, so its average is the more settled of the two.

UpkeepUpdate frequency

HazMat Reference ships an update every 4 months, Hazmat Registration Search every 5 months. The most recent releases landed on November 10, 2026 and November 3, 2026 respectively.

Scorecard5 real differences · 6 level
HazMat Reference versus Hazmat Registration Search: the parameters behind the verdict, then further details
ParameterHazMat ReferenceHazmat Registration Search
Price$4.99Free — better
Rating4.8 (1.8K ratings)5.0 (2 ratings) — better
Positive reviews95.9% of reviews—
Number of ratings1.8K — better2
Update frequencyEvery 4 months — betterEvery 5 months
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
Best chart rank#25 — better—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS14.011.0 — better
Further details — not scored
Size75 MB17 MB
Age rating12+4+
DeveloperThatsMyStapler Inc.Pipeline and Hazardous Materials Safety Administration

Customer experience

HazMat Reference

All ratings1,723 ratings
Positive96.4%
Neutral1.7%
Negative1.9%
Written reviews170 reviews
Positive95.9%
Neutral2.4%
Negative1.8%

Hazmat Registration Search

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

HazMat Reference

Reported bugs

1 issue
  • Bulk packaging information part of CFR 49 won't load

Requested features

2 requests
  • Format for larger phones
  • Ability to print guide or reference material

Hazmat Registration Search

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

HazMat Reference

No in-app purchases

None

Hazmat Registration Search

No in-app purchases

Questions

Is HazMat Reference free?
HazMat Reference costs $4.99, with no in-app purchases.
Is Hazmat Registration Search free?
Hazmat Registration Search is free to download, with no in-app purchases.
Which has better reviews, HazMat Reference or Hazmat Registration Search?
Hazmat Registration Search is rated higher. HazMat Reference averages 4.8 out of 5 from 1.8K ratings, while Hazmat Registration Search averages 5.0 from 2 ratings.
Do HazMat Reference or Hazmat Registration Search have ads?
Neither HazMat Reference nor Hazmat Registration Search shows ads.
Which is updated more often, HazMat Reference or Hazmat Registration Search?
HazMat Reference ships an update every 4 months, and Hazmat Registration Search every 5 months. Most recently, HazMat Reference was updated on November 10, 2026 and Hazmat Registration Search on November 3, 2026.

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