# Orifice Flow vs Flow Rate Conversion

The clearest difference is review sentiment: Orifice Flow at 100% against Flow Rate Conversion's 0%. Orifice Flow also leads on rating (4.0 vs 3.0) and update cadence (every 12 months vs every 29 months). Flow Rate Conversion's advantage is price ($2.99 vs $3.99). On ratings volume, ads, in-app purchases and monetization model there is nothing between them.

Orifice Flow costs $3.99 and Flow Rate Conversion $2.99 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 3.0. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews point the same way: 100% of Orifice Flow's written reviews are positive against 0% of Flow Rate Conversion's.

Orifice Flow ships an update every 12 months, Flow Rate Conversion every 29 months. The most recent releases landed on September 9, 2026 and September 13, 2026 respectively.

## The numbers

| Metric | Orifice Flow | Flow Rate Conversion |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | **[4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews)** | [3.0 (1 ratings)](https://appshunter.io/ios/app/flow-rate-conversion/id525300855/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | **100.0% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 12 months** | Every 29 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) | [Nitrio](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


### Flow Rate Conversion

[App page](https://appshunter.io/ios/app/flow-rate-conversion/id525300855)

Easily convert between various units of flow rate, including volume-based, mass-based, and mole-based measurements. Essential for physics and engineering applications involving fluid dynamics and hydrometry.

**Highlights:** Volume flow rate conversion, Mass flow rate conversion, Mole-based flow rate conversion, Physics and engineering utility, Fluid dynamics calculations

**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 Flow Rate Conversion free?

Flow Rate Conversion costs $2.99, with no in-app purchases.

### Which has better reviews, Orifice Flow or Flow Rate Conversion?

Orifice Flow is rated higher. Orifice Flow averages 4.0 out of 5 from 1 ratings, while Flow Rate Conversion averages 3.0 from 1 ratings.

### Do Orifice Flow or Flow Rate Conversion have ads?

Neither Orifice Flow nor Flow Rate Conversion shows ads.

### Which is updated more often, Orifice Flow or Flow Rate Conversion?

Orifice Flow ships an update every 12 months, and Flow Rate Conversion every 29 months. Most recently, Orifice Flow was updated on September 9, 2026 and Flow Rate Conversion on September 13, 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.*