# UN Number vs Decon Field Guide

UN Number and Decon Field Guide both sit at 4.7 stars, but that hides the real split: 63% of UN Number's written reviews are positive against 0% of Decon Field Guide's. UN Number also leads on ratings volume (55 vs 8) and iOS requirement (11.0 vs 15.1). Decon Field Guide's advantage is in-app purchases (none vs 5). On price, rating, update cadence and ads there is nothing between them.

Both are free to download. UN Number sells 5 in-app purchases, starting at $1.99 per month. Decon Field Guide asks for nothing beyond the download.

On the App Store both sit at effectively the same score — 4.7 for UN Number against 4.6 for Decon Field Guide. That said, the two scores are not equally well evidenced: UN Number has 55 ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 63% of UN Number's written reviews are positive against 0% of Decon Field Guide's.

UN Number ships an update every 3 months, Decon Field Guide every 2 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | UN Number | Decon Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.7 (55 ratings)](https://appshunter.io/ios/app/un-number/id307373793/reviews)** | [4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews) |
| Number of ratings | **55** | 8 |
| Positive reviews | **63.0% of reviews** | 0.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 months | **Every 2 months** |
| Monetization | Free with in-app purchases | **Ad-supported** |
| Size | 44 MB | 74 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [ZWEIDENKER Holding GmbH](https://appshunter.io/developer/307356444) | [First Line Technology](https://appshunter.io/developer/1388378943) |

## What reviewers say

### UN Number

[App page](https://appshunter.io/ios/app/un-number/id307373793)

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.

**Highlights:** Enter UN numbers via keypad, Quick information retrieval, Based on ERI-Cards, Offline functionality, Categorized data display, User-friendly interface

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

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| UN⁺ Monthly | $1.99 | per month |
| UN⁺ Yearly | $17.99 | per year |
| ADR Label | $0.99 | one-time |
| Hazard Diamond | $0.99 | one-time |
| Hommel | $2.99 | one-time |


### Decon Field Guide

[App page](https://appshunter.io/ios/app/decon-field-guide/id1388378944)

This reference app provides quick and efficient decontamination methods for hundreds of threats. It features a classic Threat Index, pictorial instructions, and an in-app dwell timer to guide users through mission execution. Designed for approved users, it aims to make anyone an instant decontamination expert.

**Highlights:** Threat Index for decontamination methods, Pictorial instructions, In-app dwell timer, Covers hundreds of threats, Designed for approved users

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is UN Number free?

UN Number is free to download, with in-app purchases available.

### Is Decon Field Guide free?

Decon Field Guide is free to download, with no in-app purchases.

### Which has better reviews, UN Number or Decon Field Guide?

UN Number is rated higher. UN Number averages 4.7 out of 5 from 55 ratings, while Decon Field Guide averages 4.6 from 8 ratings.

### Do UN Number or Decon Field Guide have ads?

Neither UN Number nor Decon Field Guide shows ads.

### Which is updated more often, UN Number or Decon Field Guide?

UN Number ships an update every 3 months, and Decon Field Guide every 2 months. Most recently, UN Number was updated on October 23, 2026 and Decon Field Guide on October 25, 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.*