# A vs Open Channel Flow Pro

The clearest difference is rating: A at 3.0 against Open Channel Flow Pro's 2.0. A also leads on update cadence (every 3 weeks vs every 2 months). Open Channel Flow Pro's advantage is price ($2.99 vs $8.99) and iOS requirement (14.0 vs 18.0). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

A costs $8.99 and Open Channel Flow Pro $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

A holds the better App Store score, 3.0 against 2.0. Both are backed by a comparable volume of ratings — 2 and 2 respectively.

A ships an update every 3 weeks, Open Channel Flow Pro every 2 months. The most recent releases landed on September 23, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | A | Open Channel Flow Pro |
| --- | --- | --- |
| Price | $8.99 | **$2.99** |
| Rating | **[3.0 (2 ratings)](https://appshunter.io/ios/app/a-projects/id1469182938/reviews)** | [2.0 (2 ratings)](https://appshunter.io/ios/app/open-channel-flow-pro/id1576457515/reviews) |
| Number of ratings | 2 | 2 |
| Positive reviews | 38.5% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Paid | Paid |
| Size | 59 MB | 2 MB |
| Requires iOS | 18.0 | **14.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Jutarus Ratanasethakul](https://appshunter.io/developer/1454380236) | [Alexius Academia](https://appshunter.io/developer/1209840214) |

## What reviewers say

### A

[App page](https://appshunter.io/ios/app/a-projects/id1469182938)

This app simplifies structural analysis for engineers and architects. It uses Direct Stiffness Analysis to calculate shear forces, bending moments, and deflections for beams, trusses, and frames. Get instant results and detailed reports for documentation and learning.

**Highlights:** Direct Stiffness Analysis, Beam, truss, and frame analysis, Shear force, bending moment, deflection calculations, User-friendly interface, Detailed analysis reports, Educational resource

**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 A free?

A costs $8.99, 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, A or Open Channel Flow Pro?

A is rated higher. A averages 3.0 out of 5 from 2 ratings, while Open Channel Flow Pro averages 2.0 from 2 ratings.

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

Neither A nor Open Channel Flow Pro shows ads.

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

A ships an update every 3 weeks, and Open Channel Flow Pro every 2 months. Most recently, A was updated on September 23, 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.*