# Compare Flow vs Open Channel Flow Pro

The clearest difference is price: Compare Flow at Free against Open Channel Flow Pro's $2.99. Compare Flow also leads on rating (4.6 vs 2.0). Open Channel Flow Pro's advantage is update cadence (every 2 months vs every 32 months). On ratings volume, ads, in-app purchases and device support there is nothing between them.

Compare Flow is free to download; Open Channel Flow Pro costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Compare Flow holds the better App Store score, 4.6 against 2.0. Both are backed by a comparable volume of ratings — 5 and 2 respectively.

Compare Flow ships an update every 32 months, Open Channel Flow Pro every 2 months. The most recent releases landed on September 17, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Compare Flow | Open Channel Flow Pro |
| --- | --- | --- |
| Price | **Free** | $2.99 |
| Rating | **[4.6 (5 ratings)](https://appshunter.io/ios/app/compare-flow/id581217854/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/open-channel-flow-pro/id1576457515/reviews) |
| Number of ratings | **5** | 2 |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 32 months | **Every 2 months** |
| Monetization | **Free** | Paid |
| Size | 23 MB | 2 MB |
| Requires iOS | 15.1 | **14.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [iENGINEERING Corporation](https://appshunter.io/developer/419618955) | [Alexius Academia](https://appshunter.io/developer/1209840214) |

## 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


### Open Channel Flow Pro

[App page](https://appshunter.io/ios/app/open-channel-flow-pro/id1576457515)

This hydraulic engineering calculator simplifies complex open channel flow calculations for professionals and students. It provides accurate results for basic parameters, flow characteristics, critical flow analysis, and rating curves.

**Highlights:** Basic Hydraulic Parameters, Flow Characteristics, Critical Flow Analysis, Rating Curves, Wetted Perimeter, Area, Hydraulic Radius, Velocity, Froude Number, Hydraulic Depth

**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 Open Channel Flow Pro free?

Open Channel Flow Pro costs $2.99, with no in-app purchases.

### Which has better reviews, Compare Flow or Open Channel Flow Pro?

Compare Flow is rated higher. Compare Flow averages 4.6 out of 5 from 5 ratings, while Open Channel Flow Pro averages 2.0 from 2 ratings.

### Do Compare Flow or Open Channel Flow Pro have ads?

Neither Compare Flow nor Open Channel Flow Pro shows ads.

### Which is updated more often, Compare Flow or Open Channel Flow Pro?

Compare Flow ships an update every 32 months, and Open Channel Flow Pro every 2 months. Most recently, Compare Flow was updated on September 17, 2026 and Open Channel Flow Pro on September 13, 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.*