# Compare Flow vs Pipe Hydraulic Network Viewer

The clearest difference is in-app purchases: Compare Flow at none against Pipe Hydraulic Network Viewer's 1. Pipe Hydraulic Network Viewer's advantage is update cadence (every 6 weeks vs every 32 months). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. Pipe Hydraulic Network Viewer sells 1 one-off in-app purchase. Compare Flow asks for nothing beyond the download.

Compare Flow ships an update every 32 months, Pipe Hydraulic Network Viewer every 6 weeks. The most recent releases landed on September 17, 2026 and September 15, 2026 respectively.

## The numbers

| Metric | Compare Flow | Pipe Hydraulic Network Viewer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/compare-flow/id581217854/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 6 weeks** |
| Monetization | Free | — |
| Size | 23 MB | 1 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iENGINEERING Corporation](https://appshunter.io/developer/419618955) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### Compare Flow

[App page](https://appshunter.io/ios/app/compare-flow/id581217854)

This application helps engineers and designers evaluate the hydraulic flow capacity of various non-pressure sewer pipe types. It allows for comparisons between different pipe geometries and materials, including concrete, thermoplastic, and metal options.

**Highlights:** Manning's Formula calculation, Compare hydraulic flow capacity, Evaluate pipe geometry alternatives, Compare pipe material options, Supports concrete, thermoplastic, and metal pipes, Circular, elliptical, arch, and box sections

**Features:** macOS Compatibility

**In-app purchases:** none


### Pipe Hydraulic Network Viewer

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

**Features:** macOS Compatibility

**In-app purchases (1)**

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


## Frequently asked questions

### Is Compare Flow free?

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

### Is Pipe Hydraulic Network Viewer free?

Pipe Hydraulic Network Viewer is free to download, with in-app purchases available.

### Do Compare Flow or Pipe Hydraulic Network Viewer have ads?

Neither Compare Flow nor Pipe Hydraulic Network Viewer shows ads.

### Which is updated more often, Compare Flow or Pipe Hydraulic Network Viewer?

Compare Flow ships an update every 32 months, and Pipe Hydraulic Network Viewer every 6 weeks. Most recently, Compare Flow was updated on September 17, 2026 and Pipe Hydraulic Network Viewer on September 15, 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.*