# HVAC Pipe Sizer vs Orifice Flow

The clearest difference is in-app purchases: Orifice Flow at none against HVAC Pipe Sizer's 1. Orifice Flow also leads on review sentiment (100% vs 67%) and price ($3.99 vs $6.99). On update cadence, ads, monetization model and device support there is nothing between them.

HVAC Pipe Sizer costs $6.99 and Orifice Flow $3.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase. Orifice Flow asks for nothing beyond the download.

HVAC Pipe Sizer ships an update every 9 months, Orifice Flow every 12 months. The most recent releases landed on August 27, 2026 and September 9, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | Orifice Flow |
| --- | --- | --- |
| Price | $6.99 | **$3.99** |
| Rating | — | **[4.0 (1 ratings)](https://appshunter.io/ios/app/orifice-flow/id479581349/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 66.7% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | **Every 9 months** | Every 12 months |
| Monetization | Paid | Paid |
| Size | 17 MB | 1 MB |
| Requires iOS | 15.6 | **14.3** |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Kaup Shenoy Associates](https://appshunter.io/developer/460148822) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-steam/id336112747)

Quickly size steam pipe systems by inputting piping and steam properties. Includes a steam table calculator and HVAC equipment locator. Supports English and metric units.

**Highlights:** Steam pipe sizing, Steam table calculator, HVAC Equipment Locator, English/metric unit selection, Pipe fitting database, Slider controls for input

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| HVAC Equipment Locator | $9.99 | one-time |


### 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


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $6.99, and also offers in-app purchases.

### Is Orifice Flow free?

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

### Do HVAC Pipe Sizer or Orifice Flow have ads?

Neither HVAC Pipe Sizer nor Orifice Flow shows ads.

### Which is updated more often, HVAC Pipe Sizer or Orifice Flow?

HVAC Pipe Sizer ships an update every 9 months, and Orifice Flow every 12 months. Most recently, HVAC Pipe Sizer was updated on August 27, 2026 and Orifice Flow on September 9, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*