# Orifice Flow vs Lambda Tuner

The clearest difference is rating: Orifice Flow at 4.0 against Lambda Tuner's 3.3. Orifice Flow also leads on iOS requirement (14.3 vs 16.6). Lambda Tuner's advantage is ratings volume (3 vs 1). On price, update cadence, ads and in-app purchases there is nothing between them.

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

Orifice Flow holds the better App Store score, 4.0 against 3.3. Both are backed by a comparable volume of ratings — 1 and 3 respectively.

Orifice Flow ships an update every 12 months, Lambda Tuner every 19 months. The most recent releases landed on September 9, 2026 and July 5, 2026 respectively.

## The numbers

| Metric | Orifice Flow | Lambda Tuner |
| --- | --- | --- |
| Price | $3.99 | $3.99 |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews)** | [3.3 (3 ratings)](https://appshunter.io/ios/app/lambda-tuner/id632731065/reviews) |
| Number of ratings | 1 | **3** |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 19 months |
| Monetization | Paid | Paid |
| Size | 1 MB | 1 MB |
| Requires iOS | **14.3** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) | [Johan Bjors](https://appshunter.io/developer/632731068) |

## 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


### Lambda Tuner

[App page](https://appshunter.io/ios/app/lambda-tuner/id632731065)

This tool helps tune PID controllers using the Lambda method to calculate P, I, and D parameters. It's designed for intuitive use in various process industries and works on self-regulating and integrating loops. You can also use it to learn the impact of different PID parameters.

**Highlights:** Lambda method for PID parameter calculation, Supports self-regulating and integrating loops, Intuitive and easy to use interface, Adjustable Lambda value for reaction speed, Manual PID parameter testing, Educational tool for PID parameter impact

**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 Lambda Tuner free?

Lambda Tuner costs $3.99, with no in-app purchases.

### Which has better reviews, Orifice Flow or Lambda Tuner?

Orifice Flow is rated higher. Orifice Flow averages 4.0 out of 5 from 1 ratings, while Lambda Tuner averages 3.3 from 3 ratings.

### Do Orifice Flow or Lambda Tuner have ads?

Neither Orifice Flow nor Lambda Tuner shows ads.

### Which is updated more often, Orifice Flow or Lambda Tuner?

Orifice Flow ships an update every 12 months, and Lambda Tuner every 19 months. Most recently, Orifice Flow was updated on September 9, 2026 and Lambda Tuner on July 5, 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.*