UN Number vs ChesHaz
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
UN Number
Quickly access essential information for hazardous materials emergencies. This reference guide provides detailed data based on established emergency response cards, usable even without an internet connection. It's designed for rapid retrieval of critical details in critical situations.
- Enter UN numbers via keypad
- Quick information retrieval
- Based on ERI-Cards
- Offline functionality
- Categorized data display
- User-friendly interface
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Hazardous Materials Reference Guide: You can enter the UN number after starting the application using a big and easy to use keypad. Information can thus be retrieved quickly. This product uses ERI-Cards based Information but is not endorsed, certified or otherwise approved in any way by CEFIC. "The CEFIC Emergency Response Intervention Cards (ERICards or ERIC's) provide guidance on initial actions for fire crews when they first arrive at the scene of a chemical transport accident without having appropriate and reliable product specific emergency information at hand". (source: :www.ericards.net) The ERICards are displayed as a table following the seven categories. An internet connection is not needed to display the ERICards. Therefore, the app can be used with an ipod touch or in remote areas without internet connection. ------------------------ Disclaimer: The information displayed is based on the CEFIC-"Emergency Response Intervention Cards" (ERI-Cards). They are available at the Cefic website free of charge. The price you pay for this application is for the user-interface, data-formatting and search function. Cefic has developed ERICards in good faith and has made every effort to ensure the reliability and completeness of the information provided. They are designed as guidelines to be used by fire crews, in the case of an emergency response to a chemical transport accident. The information available on the ERICards should be applied on the basis of sound judgement, taking into consideration the particular circumstances of each accident and the specialised equipment available. Consequently, this information may not be sufficient or appropriate in all cases and the Cefic and 2denker will not be liable for the results of any misinterpretation or misuse of this information by fire crews or any other persons. Tags: Hazardous Materials Reference
ChesHaz
Quickly identify hazardous materials using four-digit UN/NA numbers found on placards. Access chemical names and additional information offline. Links to external resources provide further details.
- Offline UN/NA number lookup
- Chemical name display
- Links to Wikipedia
- Links to NOAA information
- Educational purposes
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This is a quick, free app to look up the four-digit "UN/NA" numbers on the hazmat placards affixed to highway and rail tankers. The chemical names and other information is shown. The main data is stored off-line, so it is available when there is no network connectivity. There are links to Wikipedia pages and official online information from NOAA in the US. This app was written for educational purposes only. Though this data is carefully derived from official US government web pages and is believed to be presented accurately, first responders and other life savers should probably rely on hazmat apps from official sources.
Screenshots
Verdict
The clearest difference is review sentiment: ChesHaz at 100% against UN Number's 63%. ChesHaz also leads on in-app purchases (none vs 5) and rating (5.0 vs 4.7). UN Number's advantage is ratings volume (55 vs 4). On price, ads, device support and iOS requirement 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
Both are free to download. UN Number sells 5 in-app purchases, starting at $1.99 per month. ChesHaz asks for nothing beyond the download.
ChesHaz holds the better App Store score, 5.0 against 4.7. That said, the two scores are not equally well evidenced: UN Number has 55 ratings behind it against 4, so its average is the more settled of the two. Written reviews point the same way: 63% of UN Number's written reviews are positive against 100% of ChesHaz's.
UN Number ships an update every 3 months, ChesHaz every 6 weeks. The most recent releases landed on November 6, 2026 and November 2, 2026 respectively.
| Parameter | UN Number | ChesHaz |
|---|---|---|
| Price | Free | Free |
| Rating | 4.7 (55 ratings) | 5.0 (4 ratings) — better |
| Positive reviews | 63.0% of reviews | 100.0% of reviews — better |
| Number of ratings | 55 — better | 4 |
| Update frequency | Every 3 months | Every 6 weeks — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 11.0 | 10.0 — better |
| Further details — not scored | ||
| Size | 44 MB | 3 MB |
| Age rating | 4+ | 4+ |
| Developer | ZWEIDENKER Holding GmbH | WIlliam Cheswick |
Customer experience
UN Number
ChesHaz
In-app purchases
UN Number
- UN⁺ Monthly14 Days trial$1.991 Month
- UN⁺ Yearly14 Days trial$17.991 Year
- ADR Label$0.99
- Hazard Diamond$0.99
- Hommel$2.99
ChesHaz
No in-app purchases
Questions
Is UN Number free?
Is ChesHaz free?
Which has better reviews, UN Number or ChesHaz?
Do UN Number or ChesHaz have ads?
Which is updated more often, UN Number or ChesHaz?
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