# A vs Open Channel Flow Pro

The clearest difference is rating: Open Channel Flow Pro at 1.7 against A's 1.0. Open Channel Flow Pro also leads on price ($2.99 vs $9.99) and ratings volume (3 vs 1). A's advantage is update cadence (fortnightly vs every 3 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

A costs $9.99 and Open Channel Flow Pro $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Open Channel Flow Pro holds the better App Store score, 1.7 against 1.0. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

A ships an update fortnightly, Open Channel Flow Pro every 3 months. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | A | Open Channel Flow Pro |
| --- | --- | --- |
| Price | $9.99 | **$2.99** |
| Rating | [1.0 (1 ratings)](https://appshunter.io/ios/app/a-frame3d-pro/id1207537713/reviews) | **[1.7 (3 ratings)](https://appshunter.io/ios/app/open-channel-flow-pro/id1576457515/reviews)** |
| Number of ratings | 1 | **3** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 23 MB | 2 MB |
| Requires iOS | 18.6 | **15.0** |
| 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-frame3d-pro/id1207537713)

Analyze complex 3D space frames with this powerful yet easy-to-use application. Input node coordinates, member alignments, and material properties to solve structures and view step-by-step calculations. Visualize deformations and generate shear force and bending moment diagrams.

**Highlights:** 3D space frame analysis, Stiffness Matrix Method, Step-by-step calculation display, Equilibrium check, Deformation visualization, Shear Force & Bending Moment Diagrams

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

**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 $9.99, 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?

Open Channel Flow Pro is rated higher. A averages 1.0 out of 5 from 1 ratings, while Open Channel Flow Pro averages 1.7 from 3 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 fortnightly, and Open Channel Flow Pro every 3 months. Most recently, A was updated on October 6, 2026 and Open Channel Flow Pro on October 17, 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.*