# Orifice Flow vs Pressure Vessel Pro

The clearest difference is review sentiment: Orifice Flow at 100% against Pressure Vessel Pro's 33%. Orifice Flow also leads on price ($3.99 vs $5.99). Pressure Vessel Pro's advantage is rating (4.5 vs 4.0) and update cadence (every 5 months vs every 12 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Orifice Flow costs $3.99 and Pressure Vessel Pro $5.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Pressure Vessel Pro holds the better App Store score, 4.5 against 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews complicate that: 100% of Orifice Flow's written reviews are positive against 33% of Pressure Vessel Pro's, so the app with the better star average is not the one people write more warmly about.

Orifice Flow ships an update every 12 months, Pressure Vessel Pro every 5 months. Both last shipped on November 1, 2026.

## The numbers

| Metric | Orifice Flow | Pressure Vessel Pro |
| --- | --- | --- |
| Price | **$3.99** | $5.99 |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews) | **[4.5 (2 ratings)](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | **100.0% of reviews** | 33.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 5 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 10 MB |
| Requires iOS | 14.3 | **12.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [J.R.Hobbs](https://appshunter.io/developer/395110523) |

## What reviewers say

### Orifice Flow

[App page](https://appshunter.io/ios/app/orifice-flow/id479581349)

Calculate fluid flow rates in pipes and conduits using orifice plates. Supports common industrial fluids and custom fluid properties, with adjustable units and orifice types. Ideal for engineers and designers.

**Highlights:** Fluid flow rate computation, Supports 15 common industrial fluids, Custom fluid property input and saving, Multiple orifice plate types, Adjustable units (SI/USCS), Detailed computation model documentation

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

**In-app purchases:** none


### Pressure Vessel Pro

[App page](https://appshunter.io/ios/app/pressure-vessel-pro/id535696875)

Perform essential pressure vessel stress calculations with ease. Input dimensions for various tank geometries and instantly get results, including detailed formulae and ASME code compliance. Generate and share PDF reports with schematics.

**Highlights:** Pressure vessel stress calculations, ASME Boiler & Pressure Vessel Code compliance, Support for vertical, horizontal, and spherical tanks, Component stress calculations (cylinders, heads), Generate and share PDF reports, Flexible unit system (Metric/English), Save multiple calculation cases

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Orifice Flow free?

Orifice Flow costs $3.99, with no in-app purchases.

### Is Pressure Vessel Pro free?

Pressure Vessel Pro costs $5.99, with no in-app purchases.

### Which has better reviews, Orifice Flow or Pressure Vessel Pro?

Pressure Vessel Pro is rated higher. Orifice Flow averages 4.0 out of 5 from 1 ratings, while Pressure Vessel Pro averages 4.5 from 2 ratings.

### Do Orifice Flow or Pressure Vessel Pro have ads?

Neither Orifice Flow nor Pressure Vessel Pro shows ads.

### Which is updated more often, Orifice Flow or Pressure Vessel Pro?

Orifice Flow ships an update every 12 months, and Pressure Vessel Pro every 5 months. Most recently, Orifice Flow was updated on November 1, 2026 and Pressure Vessel Pro on November 1, 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.*