# NPMS Public Viewer vs Decon Field Guide

The clearest difference is rating: Decon Field Guide at 4.6 against NPMS Public Viewer's 4.0. NPMS Public Viewer's advantage is review sentiment (40% vs 0%) and monetization model (free vs ad-supported). On price, ratings volume, update cadence and ads there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Decon Field Guide holds the better App Store score, 4.6 against 4.0. Both are backed by a comparable volume of ratings — 4 and 8 respectively. Written reviews complicate that: 40% of NPMS Public Viewer's written reviews are positive against 0% of Decon Field Guide's, so the app with the better star average is not the one people write more warmly about.

Both ship on a similar rhythm, roughly every 2 months. The most recent releases landed on October 16, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | NPMS Public Viewer | Decon Field Guide |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.0 (4 ratings)](https://appshunter.io/ios/app/npms-public-viewer/id1232277603/reviews) | **[4.6 (8 ratings)](https://appshunter.io/ios/app/decon-field-guide/id1388378944/reviews)** |
| Number of ratings | 4 | **8** |
| Positive reviews | **40.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | Every 2 months |
| Monetization | **Free** | Ad-supported |
| Size | 2 MB | 74 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) | [First Line Technology](https://appshunter.io/developer/1388378943) |

## What reviewers say

### NPMS Public Viewer

[App page](https://appshunter.io/ios/app/npms-public-viewer/id1232277603)

View maps of hazardous liquid and gas transmission pipelines. Discover pipeline operators, the materials they transport, and contact information. Locate pipelines by county, offshore area, or proximity to your current location.

**Highlights:** Hazardous pipeline maps, Operator identification, Material transported details, Contact information, Location-based search, County and offshore area selection

**In-app purchases:** none


### 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 NPMS Public Viewer free?

NPMS Public Viewer is free to download, with no in-app purchases.

### Is Decon Field Guide free?

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

### Which has better reviews, NPMS Public Viewer or Decon Field Guide?

Decon Field Guide is rated higher. NPMS Public Viewer averages 4.0 out of 5 from 4 ratings, while Decon Field Guide averages 4.6 from 8 ratings.

### Do NPMS Public Viewer or Decon Field Guide have ads?

Neither NPMS Public Viewer nor Decon Field Guide shows ads.

### Which is updated more often, NPMS Public Viewer or Decon Field Guide?

NPMS Public Viewer ships an update every 2 months, and Decon Field Guide every 2 months. Most recently, NPMS Public Viewer was updated on October 16, 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.*