# NPMS/PP App vs NPMS Public Viewer

The clearest difference is update cadence: NPMS Public Viewer at every 2 months against NPMS/PP App's every 11 months. On price, ads, in-app purchases and device support there is nothing between them.

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

NPMS/PP App ships an update every 11 months, NPMS Public Viewer every 2 months. The most recent releases landed on September 14, 2026 and September 22, 2026 respectively.

## The numbers

| Metric | NPMS/PP App | NPMS Public Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.0 (4 ratings)](https://appshunter.io/ios/app/npms-public-viewer/id1232277603/reviews)** |
| Number of ratings | — | **4** |
| Positive reviews | — | 40.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 11 months | **Every 2 months** |
| Monetization | — | Free |
| Size | 24 MB | 2 MB |
| Requires iOS | 15.0 | **14.0** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Centre for Ecology and Hydrology](https://appshunter.io/developer/986306797) | [Pipeline and Hazardous Materials Safety Administration](https://appshunter.io/developer/954888820) |

## What reviewers say

### NPMS/PP App

[App page](https://appshunter.io/ios/app/npmspp-app/id1161238829)

**Features:** Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is NPMS/PP App free?

NPMS/PP App is free to download, with no in-app purchases.

### Is NPMS Public Viewer free?

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

### Do NPMS/PP App or NPMS Public Viewer have ads?

Neither NPMS/PP App nor NPMS Public Viewer shows ads.

### Which is updated more often, NPMS/PP App or NPMS Public Viewer?

NPMS/PP App ships an update every 11 months, and NPMS Public Viewer every 2 months. Most recently, NPMS/PP App was updated on September 14, 2026 and NPMS Public Viewer on September 22, 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.*