# Niagara 4Valve Controller vs Observation

The clearest difference is update cadence: Observation at every 2 weeks against Niagara 4Valve Controller's every 2 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.

Niagara 4Valve Controller ships an update every 2 months, Observation every 2 weeks. The most recent releases landed on October 27, 2026 and November 3, 2026 respectively.

## The numbers

| Metric | Niagara 4Valve Controller | Observation |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 2 weeks** |
| Size | 27 MB | 80 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Niagara Automation](https://appshunter.io/developer/1459220336) | [Observation International](https://appshunter.io/developer/1464543487) |

## What reviewers say

### Niagara 4Valve Controller

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

**Features:** macOS Compatibility

**In-app purchases:** none


### Observation

[App page](https://appshunter.io/ios/app/observation/id6446407612)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Niagara 4Valve Controller free?

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

### Is Observation free?

Observation is free to download, with no in-app purchases.

### Do Niagara 4Valve Controller or Observation have ads?

Neither Niagara 4Valve Controller nor Observation shows ads.

### Which is updated more often, Niagara 4Valve Controller or Observation?

Niagara 4Valve Controller ships an update every 2 months, and Observation every 2 weeks. Most recently, Niagara 4Valve Controller was updated on October 27, 2026 and Observation on November 3, 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.*