# Orifice Flow vs PIDTune

The clearest difference is rating: PIDTune at 5.0 against Orifice Flow's 4.0. PIDTune also leads on update cadence (every 4 months vs every 12 months). Orifice Flow's advantage is price ($3.99 vs $4.99). On review sentiment, ratings volume, ads and in-app purchases there is nothing between them.

Orifice Flow costs $3.99 and PIDTune $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

PIDTune holds the better App Store score, 5.0 against 4.0. Both are backed by a comparable volume of ratings — 1 and 2 respectively. Written reviews split almost evenly too, at 100% and 100% positive.

Orifice Flow ships an update every 12 months, PIDTune every 4 months. The most recent releases landed on September 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Orifice Flow | PIDTune |
| --- | --- | --- |
| Price | **$3.99** | $4.99 |
| Rating | [4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/pidtune/id1045174726/reviews)** |
| Number of ratings | 1 | **2** |
| Positive reviews | 100.0% of reviews | 100.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 4 months** |
| Monetization | Paid | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | **14.3** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Richard H Street](https://appshunter.io/developer/954888336) |

## 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


### PIDTune

[App page](https://appshunter.io/ios/app/pidtune/id1045174726)

This utility calculates PID tuning parameters using the IMC method for various process and controller types. It allows for direct input of process gain or variable changes, with adjustable tuning aggression via a slider.

**Highlights:** IMC method for PID tuning, Calculates Kc, Ti, Td, Supports FO, SO, and I process types, Handles Parallel and Series controller types, Adjustable tuning aggression slider, Input process gain or variable changes

**Features:** macOS Compatibility, 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 PIDTune free?

PIDTune costs $4.99, with no in-app purchases.

### Which has better reviews, Orifice Flow or PIDTune?

PIDTune is rated higher. Orifice Flow averages 4.0 out of 5 from 1 ratings, while PIDTune averages 5.0 from 2 ratings.

### Do Orifice Flow or PIDTune have ads?

Neither Orifice Flow nor PIDTune shows ads.

### Which is updated more often, Orifice Flow or PIDTune?

Orifice Flow ships an update every 12 months, and PIDTune every 4 months. Most recently, Orifice Flow was updated on September 9, 2026 and PIDTune on September 21, 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.*