Comparison

HydroCalc Plus vs Volume in Pipe

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

Volume in Pipe

Quickly estimate the gas volume within pipes, launchers, or vessels. Input operating conditions and pipe size for an approximate volume calculation. This tool is designed for rapid field estimates.

Highlights
  • Estimate gas volume
  • Input operating conditions
  • Select pipe size
  • Quick field estimates
  • Supports iPhone
Features
Read full description

Volume in Pipe (V.i.P.) is a simple, efficient tool for estimating the gas volume contained in a pipe, pig launcher/receiver, or vessel. Enter basic operating conditions, select a pipe size, and the app provides an approximate volume based on general assumptions. This tool is intended for quick field estimates only. It does not incorporate detailed gas analysis, which may significantly affect calculated volumes.

Screenshots

HydroCalc Plus4 screens
Volume in Pipe4 screens

Verdict

The call

The clearest difference is price: Volume in Pipe at Free against HydroCalc Plus's $3.99. Volume in Pipe also leads on in-app purchases (none vs 4). HydroCalc Plus's advantage is update cadence (every 3 weeks vs every 26 months) and device support (3 vs 1). On rating, ratings volume, ads and iOS requirement 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

Volume in Pipe is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. Volume in Pipe 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 Volume in Pipe. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

UpkeepUpdate frequency

HydroCalc Plus ships an update every 3 weeks, Volume in Pipe every 26 months. The most recent releases landed on August 31, 2026 and September 10, 2026 respectively.

Scorecard5 real differences · 5 level
HydroCalc Plus versus Volume in Pipe: the parameters behind the verdict, then further details
ParameterHydroCalc PlusVolume in Pipe
Price$3.99Free — better
Rating5.0 (1 ratings)5.0 (1 ratings)
Positive reviews100.0% of reviews—
Number of ratings11
Update frequencyEvery 3 weeks — betterEvery 26 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
DevicesiPhone, iPad, iPod — betteriPhone
Requires iOS15.1 — better16.6
Further details — not scored
Size34 MB11 MB
Age rating4+4+
DeveloperTransparent Blue Water LLCKelly Gayneaux

Customer experience

HydroCalc Plus

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

Volume in Pipe

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

Volume in Pipe

No in-app purchases

Questions

Is HydroCalc Plus free?
HydroCalc Plus costs $3.99, and also offers in-app purchases.
Is Volume in Pipe free?
Volume in Pipe is free to download, with no in-app purchases.
Which has better reviews, HydroCalc Plus or Volume in Pipe?
HydroCalc Plus and Volume in Pipe are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.
Do HydroCalc Plus or Volume in Pipe have ads?
Neither HydroCalc Plus nor Volume in Pipe shows ads.
Which is updated more often, HydroCalc Plus or Volume in Pipe?
HydroCalc Plus ships an update every 3 weeks, and Volume in Pipe every 26 months. Most recently, HydroCalc Plus was updated on August 31, 2026 and Volume in Pipe on September 10, 2026.

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