# Compare Flow vs Hydraulic Power Unit

The clearest difference is iOS requirement: Hydraulic Power Unit at 6.0 against Compare Flow's 15.1. On price, update cadence, ads and in-app purchases there is nothing between them.

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

Compare Flow ships an update every 32 months, Hydraulic Power Unit every 37 months. The most recent releases landed on September 17, 2026 and December 9, 2025 respectively.

## The numbers

| Metric | Compare Flow | Hydraulic Power Unit |
| --- | --- | --- |
| 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 | No |
| Ads | No | No |
| Update frequency | **Every 32 months** | Every 37 months |
| Monetization | Free | — |
| Size | 23 MB | 4 MB |
| Requires iOS | 15.1 | **6.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iENGINEERING Corporation](https://appshunter.io/developer/419618955) | [Zanthic Automation Inc.](https://appshunter.io/developer/574695320) |

## 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


### Hydraulic Power Unit

[App page](https://appshunter.io/ios/app/hydraulic-power-unit/id608111471)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Compare Flow free?

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

### Is Hydraulic Power Unit free?

Hydraulic Power Unit is free to download, with no in-app purchases.

### Do Compare Flow or Hydraulic Power Unit have ads?

Neither Compare Flow nor Hydraulic Power Unit shows ads.

### Which is updated more often, Compare Flow or Hydraulic Power Unit?

Compare Flow ships an update every 32 months, and Hydraulic Power Unit every 37 months. Most recently, Compare Flow was updated on September 17, 2026 and Hydraulic Power Unit on December 9, 2025.

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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.*