Comparison

HydroCalc Plus vs HVAC Toolkit Lite

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

Head to head
About

HydroCalc Plus

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
Read full description

Professional hydraulic engineering tool for calculating pressure losses in piping systems. Essential for engineers, plumbers, and contractors designing water distribution networks. Key Features: Calculate friction head losses using industry-standard Hazen-Williams equation Support for both US (ft, gpm, psi) and SI (m, lps, bar) units Extensive pipe material library with pre-defined roughness coefficients (C-factors) Complete fittings and valves database including elbows, tees, valves, contractions, and expansions Inverse calculations to determine optimal pipe diameter, flow rate, or length for target head loss Real-time results showing velocity, friction loss, minor losses, and total system head loss What Sets Pro Apart: Unlike basic calculators, HydroCalc Pro accounts for both major losses (pipe friction) and minor losses (fittings and valves). The app includes a comprehensive database of K-factors for various components, allowing accurate total system pressure loss calculations. Perfect For: Water supply system design Irrigation network planning HVAC piping calculations Fire protection systems Industrial fluid transport Educational purposes in hydraulic engineering Technical Capabilities: The app considers all critical factors affecting pressure loss: flow velocity, pipe diameter, internal roughness, pipe length, and fitting configurations. Materials include PVC, polyethylene, steel, cast iron, concrete, and more with accurate C-factors ranging from 120-150. Inverse Calculation Mode: Unique feature allowing backward calculations - determine required pipe size for allowable head loss, maximum flow capacity, or optimal pipe length for your system constraints. Simple, intuitive interface with instant results. No internet connection required. Professional-grade calculations in your pocket. Note: Premium modules are available in English and Spanish.

About

HVAC Toolkit Lite

This tool assists HVAC engineers with design checks and quick calculations. It offers various tools for ducting friction loss, pipe sizing, ventilation, and heat load estimations, providing instructions and formulas for each calculation.

Highlights
  • Friction loss calculation
  • Pipe sizing
  • Ventilation calculations
  • Heat load estimation
  • Pump head calculation
  • Fan ESP calculation
  • Metric/Imperial units
  • English/Arabic language support
Features
Read full description

The HVAC ToolKit Lite is an easy-to-use app that has been created to assist HVAC engineers in checking their designs and making quick calculations and estimations. The app includes helpful calculation tools for calculating friction losses in ducting, pipe sizing, parking ventilation, staircase pressurization, and estimating heat loads, pump head, fan ESP, among others, where the user is able to enter the required inputs and is given the calculated output. Each tool also includes instructions and abbreviated formulas that have been used to calculate the results. The app can be set to metric or imperial units and/or to the English or Arabic language. Users are expected to have some knowledge and understanding of HVAC engineering in order to use the tools properly. Users are also expected to check that the results are within an acceptable range for their respective projects. If you come across any inconsistencies while using the app or have any recommendations for additional inclusions, please contact us.

Screenshots

HydroCalc Plus4 screens
HVAC Toolkit Lite3 screens

Verdict

The call

The clearest difference is price: HVAC Toolkit Lite at Free against HydroCalc Plus's $3.99. HVAC Toolkit Lite also leads on in-app purchases (none vs 4) and iOS requirement (12.0 vs 15.1). On rating, ratings volume, update cadence and ads 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

HVAC Toolkit Lite is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. HVAC Toolkit Lite asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 5.0 for HydroCalc Plus against 5.0 for HVAC Toolkit Lite. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

HydroCalc Plus ships an update every 3 weeks, HVAC Toolkit Lite every 11 days. The most recent releases landed on August 31, 2026 and September 11, 2026 respectively.

Scorecard4 real differences · 6 level
HydroCalc Plus versus HVAC Toolkit Lite: the parameters behind the verdict, then further details
ParameterHydroCalc PlusHVAC Toolkit Lite
Price$3.99Free — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 3 weeksEvery 11 days — better
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.112.0 — better
Further details — not scored
Size34 MB61 MB
Age rating4+4+
DeveloperTransparent Blue Water LLCMohamad Jaber

Customer experience

HydroCalc Plus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

HVAC Toolkit Lite

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

In-app purchases

4 purchases

HydroCalc Plus

One-time4
  • Pump Power Calculator$1.99
  • System Curve Generator$1.99
  • Pipe Database$1.99
Show 1 more
  • Industrial Fluids Pack$2.99
None

HVAC Toolkit Lite

No in-app purchases

Questions

Is HydroCalc Plus free?
HydroCalc Plus costs $3.99, and also offers in-app purchases.
Is HVAC Toolkit Lite free?
HVAC Toolkit Lite is free to download, with no in-app purchases.
Which has better reviews, HydroCalc Plus or HVAC Toolkit Lite?
HydroCalc Plus and HVAC Toolkit Lite are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do HydroCalc Plus or HVAC Toolkit Lite have ads?
Neither HydroCalc Plus nor HVAC Toolkit Lite shows ads.
Which is updated more often, HydroCalc Plus or HVAC Toolkit Lite?
HydroCalc Plus ships an update every 3 weeks, and HVAC Toolkit Lite every 11 days. Most recently, HydroCalc Plus was updated on August 31, 2026 and HVAC Toolkit Lite on September 11, 2026.

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