# Pipe Diameter Calculators vs FlowAnalyzer Viewer

The clearest difference is update cadence: FlowAnalyzer Viewer at every 2 months against Pipe Diameter Calculators's every 20 months. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Pipe Diameter Calculators sells 1 one-off in-app purchase and FlowAnalyzer Viewer sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

Pipe Diameter Calculators ships an update every 20 months, FlowAnalyzer Viewer every 2 months. The most recent releases landed on October 25, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Pipe Diameter Calculators | FlowAnalyzer Viewer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 20 months | **Every 2 months** |
| Size | 59 MB | 1 MB |
| Requires iOS | 15.6 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ashvin Kevadiya](https://appshunter.io/developer/1756324971) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Pipe Diameter Calculators

[App page](https://appshunter.io/ios/app/pipe-diameter-calculators/id6743020859)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lifetime | $9.99 | one-time |


### FlowAnalyzer Viewer

[App page](https://appshunter.io/ios/app/flowanalyzer-viewer/id6754879365)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HydroViewer Pro | $2.99 | one-time |


## Frequently asked questions

### Is Pipe Diameter Calculators free?

Pipe Diameter Calculators is free to download, with in-app purchases available.

### Is FlowAnalyzer Viewer free?

FlowAnalyzer Viewer is free to download, with in-app purchases available.

### Do Pipe Diameter Calculators or FlowAnalyzer Viewer have ads?

Neither Pipe Diameter Calculators nor FlowAnalyzer Viewer shows ads.

### Which is updated more often, Pipe Diameter Calculators or FlowAnalyzer Viewer?

Pipe Diameter Calculators ships an update every 20 months, and FlowAnalyzer Viewer every 2 months. Most recently, Pipe Diameter Calculators was updated on October 25, 2026 and FlowAnalyzer Viewer on October 21, 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.*