# HVAC Pipe Sizer vs HydroCalc Plus

The clearest difference is update cadence: HydroCalc Plus at every 3 weeks against HVAC Pipe Sizer's every 12 months. HydroCalc Plus also leads on review sentiment (100% vs 80%) and price ($3.99 vs $7.99). On rating, ratings volume, ads and in-app purchases there is nothing between them.

HVAC Pipe Sizer costs $7.99 and HydroCalc Plus $3.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase and HydroCalc Plus sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 5.0 for HVAC Pipe Sizer against 5.0 for HydroCalc Plus. Both are backed by a comparable volume of ratings — 1 and 1 respectively. Written reviews are what separate them: 80% of HVAC Pipe Sizer's written reviews are positive against 100% of HydroCalc Plus's.

HVAC Pipe Sizer ships an update every 12 months, HydroCalc Plus every 3 weeks. The most recent releases landed on September 9, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | HydroCalc Plus |
| --- | --- | --- |
| Price | $7.99 | **$3.99** |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews) |
| Number of ratings | 1 | 1 |
| Positive reviews | 80.0% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 12 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 18 MB | 34 MB |
| Requires iOS | 15.6 | **15.1** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Transparent Blue Water LLC](https://appshunter.io/developer/1847968351) |

## What reviewers say

### HVAC Pipe Sizer

[App page](https://appshunter.io/ios/app/hvac-pipe-sizer-gas-plus/id342239204)

Calculate gas piping systems for low and high pressure. Input flow, pressure, or diameter to find pipe sizes, velocity, and equivalent lengths. Supports English and metric units, with extensive pipe fitting data.

**Highlights:** Low and high pressure gas pipe sizing, Calculate flow, pressure drop, diameter, and velocity, Universal app for iPhone and iPad, English and metric unit support, Built-in pipe fitting equivalent length tables, Slider controls for quick adjustments

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

**In-app purchases (1)**

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


### HydroCalc Plus

[App page](https://appshunter.io/ios/app/hydrocalc-plus/id578807688)

A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.

**Highlights:** Friction head loss calculation (Hazen-Williams), US and SI unit support, Extensive pipe material library, Fittings and valves database, Inverse calculation mode, Real-time results (velocity, losses)

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

**In-app purchases (4)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Pump Power Calculator | $1.99 | one-time |
| System Curve Generator | $1.99 | one-time |
| Pipe Database | $1.99 | one-time |
| Industrial Fluids Pack | $2.99 | one-time |


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $7.99, and also offers in-app purchases.

### Is HydroCalc Plus free?

HydroCalc Plus costs $3.99, and also offers in-app purchases.

### Which has better reviews, HVAC Pipe Sizer or HydroCalc Plus?

HVAC Pipe Sizer and HydroCalc Plus are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do HVAC Pipe Sizer or HydroCalc Plus have ads?

Neither HVAC Pipe Sizer nor HydroCalc Plus shows ads.

### Which is updated more often, HVAC Pipe Sizer or HydroCalc Plus?

HVAC Pipe Sizer ships an update every 12 months, and HydroCalc Plus every 3 weeks. Most recently, HVAC Pipe Sizer was updated on September 9, 2026 and HydroCalc Plus on August 31, 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.*