# HVAC Pipe Sizer vs CalcEngineer

The clearest difference is price: CalcEngineer at Free against HVAC Pipe Sizer's $4.99. CalcEngineer also leads on in-app purchases (none vs 1) and update cadence (every 2 days vs every 6 months). HVAC Pipe Sizer's advantage is iOS requirement (15.6 vs 17). On ads and device support there is nothing between them.

CalcEngineer is free to download; HVAC Pipe Sizer costs $4.99 up front. HVAC Pipe Sizer sells 1 one-off in-app purchase. CalcEngineer asks for nothing beyond the download.

HVAC Pipe Sizer ships an update every 6 months, CalcEngineer every 2 days. The most recent releases landed on August 27, 2026 and September 12, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer | CalcEngineer |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | — | **[5.0 (2 ratings)](https://appshunter.io/ios/app/calcengineer/id6748969344/reviews)** |
| Number of ratings | — | **2** |
| Positive reviews | 71.4% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 6 months | **Every 2 days** |
| Monetization | Paid | **Free** |
| Size | 16 MB | 10 MB |
| Requires iOS | **15.6** | 17 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 9+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Justin Bush](https://appshunter.io/developer/1828308327) |

## 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 |


### CalcEngineer

[App page](https://appshunter.io/ios/app/calcengineer/id6748969344)

This app provides professional engineering calculations for compressed air systems. It helps engineers and technicians determine CFM requirements, size compressors and tanks, and analyze pressure drops for optimized pneumatic systems.

**Highlights:** CFM Calculator, Compressor & Tank Sizing, Pressure Drop Analysis, Flow Velocity & Pipe Sizing, Multiple CFM Entries, General Engineering Calculator Suite

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is HVAC Pipe Sizer free?

HVAC Pipe Sizer costs $4.99, and also offers in-app purchases.

### Is CalcEngineer free?

CalcEngineer is free to download, with no in-app purchases.

### Do HVAC Pipe Sizer or CalcEngineer have ads?

Neither HVAC Pipe Sizer nor CalcEngineer shows ads.

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

HVAC Pipe Sizer ships an update every 6 months, and CalcEngineer every 2 days. Most recently, HVAC Pipe Sizer was updated on August 27, 2026 and CalcEngineer on September 12, 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.*