# Niagara 4Valve Controller vs GPS Fields Area Measure on Map

The clearest difference is in-app purchases: Niagara 4Valve Controller at none against GPS Fields Area Measure on Map's 1. On price, update cadence, ads and device support there is nothing between them.

Both are free to download. GPS Fields Area Measure on Map sells 1 one-off in-app purchase. Niagara 4Valve Controller asks for nothing beyond the download.

Niagara 4Valve Controller ships an update every 2 months, GPS Fields Area Measure on Map every 6 weeks. The most recent releases landed on October 27, 2026 and October 30, 2026 respectively.

## The numbers

| Metric | Niagara 4Valve Controller | GPS Fields Area Measure on Map |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[4.1 (34 ratings)](https://appshunter.io/ios/app/gps-fields-area-measure-on-map/id6450924223/reviews)** |
| Number of ratings | — | **34** |
| Positive reviews | — | 42.9% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 6 weeks** |
| Monetization | — | Free |
| Size | 27 MB | 48 MB |
| Requires iOS | 14.0 | 14.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Niagara Automation](https://appshunter.io/developer/1459220336) | [SUSAMP INFOTECH](https://appshunter.io/developer/1535920005) |

## What reviewers say

### Niagara 4Valve Controller

[App page](https://appshunter.io/ios/app/niagara-4valve-controller/id1641708221)

**Features:** macOS Compatibility

**In-app purchases:** none


### GPS Fields Area Measure on Map

[App page](https://appshunter.io/ios/app/gps-fields-area-measure-on-map/id6450924223)

Easily measure land areas and distances using GPS technology. Calculate plot sizes, save favorite locations, and convert measurements between various units. Ideal for professionals, outdoor enthusiasts, and farmers.

**Highlights:** Measure land area, Measure distance between points, Save favorite locations (POIs), Select map types (normal, satellite, terrain, hybrid), Convert measurement units, Magnetic compass for navigation, Save calculations as screenshots

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $4.99 | one-time |


## Frequently asked questions

### Is Niagara 4Valve Controller free?

Niagara 4Valve Controller is free to download, with no in-app purchases.

### Is GPS Fields Area Measure on Map free?

GPS Fields Area Measure on Map is free to download, with in-app purchases available.

### Do Niagara 4Valve Controller or GPS Fields Area Measure on Map have ads?

Neither Niagara 4Valve Controller nor GPS Fields Area Measure on Map shows ads.

### Which is updated more often, Niagara 4Valve Controller or GPS Fields Area Measure on Map?

Niagara 4Valve Controller ships an update every 2 months, and GPS Fields Area Measure on Map every 6 weeks. Most recently, Niagara 4Valve Controller was updated on October 27, 2026 and GPS Fields Area Measure on Map on October 30, 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.*