# HVAC Pipe Sizer vs HydroCalc Plus

The clearest difference is update cadence: HydroCalc Plus at every 3 weeks against HVAC Pipe Sizer's every 6 months. HydroCalc Plus also leads on review sentiment (100% vs 71%) and price ($3.99 vs $4.99). On ads, in-app purchases, monetization model and device support there is nothing between them.

HVAC Pipe Sizer costs $4.99 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.

HVAC Pipe Sizer ships an update every 6 months, HydroCalc Plus every 3 weeks. The most recent releases landed on August 27, 2026 and August 31, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | HydroCalc Plus |
| --- | --- | --- |
| Price | $4.99 | **$3.99** |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/hydrocalc-plus/id578807688/reviews)** |
| Number of ratings | — | **1** |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 3 weeks** |
| Monetization | Paid | Paid |
| Size | 16 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-liquid/id325069065)

Calculate pipe sizes for liquid systems, including hot and chilled water. Input flow rate, head loss, diameter, or velocity to determine other properties. Supports various liquids, pipe materials, and fittings, with English or metric units.

**Highlights:** Liquid pipe sizing, Hydronic system calculations, Input flow, head loss, diameter, or velocity, Calculate fluid flow and head loss, Supports various liquids and pipe materials, English and metric unit options, Email results

**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 $4.99, and also offers in-app purchases.

### Is HydroCalc Plus free?

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

### 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 6 months, and HydroCalc Plus every 3 weeks. Most recently, HVAC Pipe Sizer was updated on August 27, 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.*