# Orifice Flow vs Hydrostatic Pressure Calc

The clearest difference is rating: Hydrostatic Pressure Calc at 5.0 against Orifice Flow's 4.0. Hydrostatic Pressure Calc also leads on price ($2.99 vs $3.99). Orifice Flow's advantage is update cadence (every 12 months vs every 31 months). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Orifice Flow costs $3.99 and Hydrostatic Pressure Calc $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Hydrostatic Pressure Calc holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

Orifice Flow ships an update every 12 months, Hydrostatic Pressure Calc every 31 months. The most recent releases landed on September 9, 2026 and June 25, 2026 respectively.

## The numbers

| Metric | Orifice Flow | Hydrostatic Pressure Calc |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrostatic-pressure-calc/id1420384357/reviews)** |
| Number of ratings | 1 | 1 |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 31 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | 14.3 | **13** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Tan Chia Ling](https://appshunter.io/developer/321121189) |

## 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


### Hydrostatic Pressure Calc

[App page](https://appshunter.io/ios/app/hydrostatic-pressure-calc/id1420384357)

Quickly calculate hydrostatic pressure at any depth with this physics tool. It offers instant results, supports various units, and displays the relevant formulas for reference. Optimized for ease of use and accuracy.

**Highlights:** Instant hydrostatic pressure calculation, Supports multiple input units, Includes hydrostatic pressure formulas, Results are copyable, High precision up to 16 decimal places, Lightweight and optimized

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Orifice Flow free?

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

### Is Hydrostatic Pressure Calc free?

Hydrostatic Pressure Calc costs $2.99, with no in-app purchases.

### Which has better reviews, Orifice Flow or Hydrostatic Pressure Calc?

Hydrostatic Pressure Calc is rated higher. Orifice Flow averages 4.0 out of 5 from 1 ratings, while Hydrostatic Pressure Calc averages 5.0 from 1 ratings.

### Do Orifice Flow or Hydrostatic Pressure Calc have ads?

Neither Orifice Flow nor Hydrostatic Pressure Calc shows ads.

### Which is updated more often, Orifice Flow or Hydrostatic Pressure Calc?

Orifice Flow ships an update every 12 months, and Hydrostatic Pressure Calc every 31 months. Most recently, Orifice Flow was updated on September 9, 2026 and Hydrostatic Pressure Calc on June 25, 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.*