# HVAC Pipe Sizer Plus vs Dr. DE

The clearest difference is price: Dr. DE at Free against HVAC Pipe Sizer Plus's $13.99. Dr. DE also leads on rating (4.5 vs 3.0) and update cadence (every 3 months vs every 15 months). On review sentiment, ads, in-app purchases and device support there is nothing between them.

Dr. DE is free to download; HVAC Pipe Sizer Plus costs $13.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Dr. DE holds the better App Store score, 4.5 against 3.0. That said, the two scores are not equally well evidenced: Dr. DE has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of HVAC Pipe Sizer Plus's written reviews are positive against 56% of Dr. DE's.

HVAC Pipe Sizer Plus ships an update every 15 months, Dr. DE every 3 months. The most recent releases landed on September 21, 2026 and July 18, 2026 respectively.

## The numbers

| Metric | HVAC Pipe Sizer Plus | Dr. DE |
| --- | --- | --- |
| Price | $13.99 | **Free** |
| Rating | [3.0 (1 ratings)](https://appshunter.io/ios/app/hvac-pipe-sizer-plus/id352069594/reviews) | **[4.5 (16 ratings)](https://appshunter.io/ios/app/dr-de/id954796004/reviews)** |
| Number of ratings | 1 | **16** |
| Positive reviews | 50.0% of reviews | **55.6% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 15 months | **Every 3 months** |
| Monetization | Paid | **Free** |
| Size | 27 MB | 33 MB |
| Requires iOS | 15.6 | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 17+ |
| Developer | [Carmel Software Corporation](https://appshunter.io/developer/317970398) | [Pegasus Vertex, Inc.](https://appshunter.io/developer/954796003) |

## 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


### Dr. DE

[App page](https://appshunter.io/ios/app/dr-de/id954796004)

This mobile toolbox simplifies complex drilling engineering calculations. It offers a comprehensive suite of 29 functions across 11 categories, eliminating the need for handbooks and improving efficiency for engineers and technicians.

**Highlights:** 29 drilling engineering functions, 11 functional groups, Bit hydraulics calculations, Hole cleaning analysis, Well control solutions, Unit conversion tools, Tank capacity calculations

**Features:** macOS Compatibility

**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 Dr. DE free?

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

### Which has better reviews, HVAC Pipe Sizer Plus or Dr. DE?

Dr. DE is rated higher. HVAC Pipe Sizer Plus averages 3.0 out of 5 from 1 ratings, while Dr. DE averages 4.5 from 16 ratings.

### Do HVAC Pipe Sizer Plus or Dr. DE have ads?

Neither HVAC Pipe Sizer Plus nor Dr. DE shows ads.

### Which is updated more often, HVAC Pipe Sizer Plus or Dr. DE?

HVAC Pipe Sizer Plus ships an update every 15 months, and Dr. DE every 3 months. Most recently, HVAC Pipe Sizer Plus was updated on September 21, 2026 and Dr. DE on July 18, 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.*