NPMS Public Viewer vs Decon Field Guide
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
NPMS Public Viewer
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.
- Hazardous pipeline maps
- Operator identification
- Material transported details
- Contact information
- Location-based search
- County and offshore area selection
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The Pipeline and Hazardous Materials Safety Administration’s (PHMSA) National Pipeline Mapping System (NPMS) has developed the NPMS Public Viewer iPhone app to allow the public to view hazardous liquid and gas transmission pipeline maps. The user can see who operates a pipeline, what it transports, and who to contact for further information. To get started, a user may choose one county or offshore area (including state waters or federal waters) or choose to see pipelines closest to the user’s current location. For more information about the NPMS, or to access the full desktop browser version of the NPMS Public Map Viewer, go to the NPMS website at https://www.npms.phmsa.dot.gov/.
Decon Field Guide
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.
- Threat Index for decontamination methods
- Pictorial instructions
- In-app dwell timer
- Covers hundreds of threats
- Designed for approved users
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Imagine decontamination in the palm of your hand. Introducing the all-new, redesigned Decon Field Guide. Using the same classic Threat Index, quickly and efficiently determine proper decontamination methods for hundreds of known and emerging threats and execute your mission flawlessly utilizing pictorial instructions and in-app dwell timer. Become an instant decontamination expert with the Decon Field Guide. Only available for approved users. Download now.
Screenshots
Verdict
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 ads (none vs shown). On price, ratings volume, update cadence 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
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 September 22, 2026 and June 4, 2026 respectively.
| Parameter | NPMS Public Viewer | Decon Field Guide |
|---|---|---|
| Price | Free | Free |
| Rating | 4.0 (4 ratings) | 4.6 (8 ratings) — better |
| Positive reviews | 40.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 4 | 8 — better |
| Update frequency | Every 2 months | Every 2 months |
| Ads | No — better | Yes |
| In-app purchases | No | No |
| Monetization | Free — better | Ad-supported |
| Devices | iPhone, iPod | iPhone, iPad, iPod — better |
| Requires iOS | 14.0 — better | 15.1 |
| Further details — not scored | ||
| Size | 2 MB | 73 MB |
| Age rating | 4+ | 17+ |
| Developer | Pipeline and Hazardous Materials Safety Administration | First Line Technology, LLC |
Customer experience
NPMS Public Viewer
Decon Field Guide
In-app purchases
NPMS Public Viewer
No in-app purchases
Decon Field Guide
No in-app purchases
Questions
Is NPMS Public Viewer free?
Is Decon Field Guide free?
Which has better reviews, NPMS Public Viewer or Decon Field Guide?
Do NPMS Public Viewer or Decon Field Guide have ads?
Which is updated more often, NPMS Public Viewer or Decon Field Guide?
Other comparisons
