Comparison

HVAC Pipe Sizer Plus vs Dr. DE

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

HVAC Pipe Sizer Plus

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
Read full description

The HVAC Pipe Sizer Plus application is a combination of three (3) of our individual pipe sizing applications including: 1. HVAC Pipe Sizer - Liquid 2. HVAC Pipe Sizer - Steam 3. HVAC Pipe Sizer - Gas Plus This app is a universal app that works on both the iPhone and iPad and adjusts its screen size accordingly. The "HVAC Pipe Sizer - Gas" module allows you to quickly size a simple low (less than or equal to 1.5 psi) and high (greater than 1.5 psi) pressure gas piping system by inputting a number of piping and gas properties. The "HVAC Pipe Sizer - Steam" module allows you to size a steam pipe run, and it also includes a bonus steam table calculator. The "HVAC Pipe Sizer - Liquid" module allows you to size a pipe run with many different types of liquids (or fluids), pipe material and fitting types. This app also includes the HVAC Equipment Locator. Click here for details: http://bit.ly/1yTq539 This application includes all of the great features of the individual pipe sizer apps such as the use of slider controls that allow you to quickly increment or decrement the input values and immediately observe the calculated results. It also allows you to specify different types of liquids, gases, pipe material types, fitting quantities, min and max ranges, and step values. Also, you can display a wide variety of English and Metric units. The "HVAC Pipe Sizer Plus" application was designed by Carmel Software Corporation, a leader in HVAC design software since 1995. In fact, Autodesk (the makers of AutoCAD) acquired our load calculation software and incorporated it into their leading 3D modeling software called Revit. In addition, we developed a number of customized apps for ASHRAE, DNV GL, and other organizations. We also offer the following additional apps for the iPhone and iPad: 1. HVAC Residential Load Calcs for iPhone and iPad 2. HVAC Quick Load Plus 3. HVAC Quick Load 4. HVAC Toolkit 5. HVAC Pipe Sizer – Gas Low Pressure 6. HVAC Pipe Sizer - Gas High Pressure 7. HVAC Pipe Sizer – Liquid 8. HVAC Pipe Sizer – Steam 9. Steam Tables 10. Psychrometric Plus 11. Psychrometric LT 12. HVAC Pipe Sizer Plus 13. HVAC Pipe Sizer Gas Plus 14. HVAC Toolkit Ultimate 15. HVAC Equipment Locator 16. HVAC ResLoad-J 17. HVAC Psych HD

About

Dr. DE

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
Read full description

Do you want to solve drilling engineering problems in seconds? It is easier than ever before to use Dr. DE Lite mobile app, a must-have toolbox app that includes a substantial collection of functions for every drilling engineer and technician. Bid farewell to flipping through handbooks, textbooks, standards, etc. for answers. This free app, sophisticated yet simple to use, not only saves time and money, but also makes your engineering and sales efforts more reliable and professional. The Dr. DE Lite app is equipped with 29 functions that are divided into 11 groups. --Bit Hydraulics --Casing Centralizer --Hole Cleaning --Hydraulics --Mud Additives --Pipe --Pump --Tank Capacity --Volume and Capacity --Well Control --Unit Conversion

Screenshots

HVAC Pipe Sizer Plus4 screens
Dr. DE4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard5 real differences · 5 level
HVAC Pipe Sizer Plus versus Dr. DE: the parameters behind the verdict, then further details
ParameterHVAC Pipe Sizer PlusDr. DE
Price$13.99Free — better
Rating3.0 (1 ratings)4.5 (16 ratings) — better
Positive reviews50.0% of reviews55.6% of reviews — better
Number of ratings116 — better
Update frequencyEvery 15 monthsEvery 3 months — better
AdsNoNo
In-app purchasesNoNo
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.6
Further details — not scored
Size27 MB33 MB
Age rating4+17+
DeveloperCarmel Software CorporationPegasus Vertex, Inc.

Customer experience

HVAC Pipe Sizer Plus

All ratings1 ratings
Positive0.0%
Neutral100.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

Dr. DE

All ratings16 ratings
Positive87.5%
Neutral0.0%
Negative12.5%
Written reviews9 reviews
Positive55.6%
Neutral0.0%
Negative44.4%

In-app purchases

None

HVAC Pipe Sizer Plus

No in-app purchases

None

Dr. DE

No in-app purchases

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.

Other comparisons