# HVAC Pipe Sizer Plus vs Fluid Mechanics Calculator

The clearest difference is review sentiment: HVAC Pipe Sizer Plus at 67% against Fluid Mechanics Calculator's 0%. Fluid Mechanics Calculator's advantage is price ($2.99 vs $13.99) and rating (4.5 vs 3.0). On ads, in-app purchases, monetization model and device support there is nothing between them.

HVAC Pipe Sizer Plus costs $13.99 and Fluid Mechanics Calculator $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Fluid Mechanics Calculator holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Fluid Mechanics Calculator has 21 ratings behind it against 1, so its average is the more settled of the two. Written reviews complicate that: 67% of HVAC Pipe Sizer Plus's written reviews are positive against 0% of Fluid Mechanics Calculator's, so the app with the better star average is not the one people write more warmly about.

HVAC Pipe Sizer Plus ships an update every 15 months, Fluid Mechanics Calculator every 7 months. Both last shipped on November 6, 2026.

## The numbers

| Metric | HVAC Pipe Sizer Plus | Fluid Mechanics Calculator |
| --- | --- | --- |
| Price | $13.99 | **$2.99** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594/reviews) | **[4.5 (21 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calculator/id526974981/reviews)** |
| Number of ratings | 1 | **21** |
| Positive reviews | **66.7% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 7 months** |
| Monetization | Paid | Paid |
| Size | 2 MB | 11 MB |
| Requires iOS | 17.0 | **16.1** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | +4 | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [V PUGAZHENTHI](https://appshunter.io/developer/491898049) |

## What reviewers say

### HVAC Pipe Sizer Plus

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594)

This utility app combines three specialized pipe sizing tools for HVAC systems: liquid, steam, and gas. It offers flexible input options, unit conversions, and an equipment locator for comprehensive HVAC design.

**Highlights:** Liquid pipe sizing, Steam pipe sizing with steam table calculator, Gas pipe sizing (low and high pressure), HVAC Equipment Locator, Slider controls for input adjustments, English and Metric unit display

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

**In-app purchases:** none


### Fluid Mechanics Calculator

[App page](https://appshunter.io/ios/app/fluid-mechanics-calculator/id526974981)

This app provides 97 calculators for fluid mechanics and civil engineering parameters. It supports both Imperial (USCS) and Metric (SI) units, offering automatic and accurate calculations with unit changes.

**Highlights:** 97 fluid mechanics and civil engineering calculators, Supports SI and USCS (Imperial) units, Automatic calculations with unit changes, Wide range of parameters covered, Civil engineering applications

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

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer Plus free?

HVAC Pipe Sizer Plus costs $13.99, with no in-app purchases.

### Is Fluid Mechanics Calculator free?

Fluid Mechanics Calculator costs $2.99, with no in-app purchases.

### Which has better reviews, HVAC Pipe Sizer Plus or Fluid Mechanics Calculator?

Fluid Mechanics Calculator is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while Fluid Mechanics Calculator averages 4.5 from 21 ratings.

### Do HVAC Pipe Sizer Plus or Fluid Mechanics Calculator have ads?

Neither HVAC Pipe Sizer Plus nor Fluid Mechanics Calculator shows ads.

### Which is updated more often, HVAC Pipe Sizer Plus or Fluid Mechanics Calculator?

HVAC Pipe Sizer Plus ships an update every 15 months, and Fluid Mechanics Calculator every 7 months. Most recently, HVAC Pipe Sizer Plus was updated on November 6, 2026 and Fluid Mechanics Calculator on November 6, 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.*