Comparison

Pipe Flow Gas Pressure Drop vs Mechanical Engineering Toolkit

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

Head to head
About

Pipe Flow Gas Pressure Drop

This app calculates gas pressure loss in pipes using various compressible flow equations. It automatically handles gas density changes and provides detailed results including Reynolds number and friction factors. Users can customize pipe materials, fittings, and gases from integrated or custom databases.

Highlights
  • Friction and fitting loss calculations
  • Multiple compressible flow equations
  • Automatic gas density handling
  • Customizable pipe, fitting, and gas data
  • Imperial and Metric unit support
  • Professional Excel and PDF reports
  • Results verification against published data
Features
Read full description

Pipe Flow Gas Pressure Drop is a pressure loss calculator app from Pipe Flow Software that performs calculations using compressible isothermal equations to calculate friction loss and fitting loss results. Pressure losses can be calculated using the General Fundamental Flow, Complete Isothermal Flow, AGA, IGT, Panhandle A, Panhandle B and Weymouth equations. Changes in gas density are handled automatically using the Ideal Gas Law together with either a calculated CNGA compressibility factor or a specified a custom compressibility. The atmospheric pressure and standard volume conditions can also be defined as required. Pipe Flow Software applications are used by engineers in over 100 countries worldwide. The Gas Pressure Drop App has an intuitive user interface that allows for easy entry of the input data, including changes in elevation, and selection of valves & fittings. Comprehensive results include Reynolds number, friction factor, friction losses, fitting losses, fluid velocities and more. Each result is clearly displayed using expandable sections that reveal further information as needed. Users can select pipe materials, pipe diameters, pipe fittings (k factors) and gases from the integrated databases, and these can also be extended with user specific data for custom pipe materials, diameters, fittings, and gas properties. An integrated gas properties calculator assists the user with the creation of user defined gas data at a specific temperature and pressure condition. The App can operate in Imperial or Metric units and each individual field can be further customised to use a specific unit. Results values can be displayed to a specified number of decimal places. Pipe Flow Gas Pressure Drop calculation results have been verified against multiple cases of published data from well known sources. The results of these calculations are included in the Compressible Results Verification PDF document which can be accessed from within the App. Engineers can easily perform their gas pressure drop calculations in the office or on site. Professional Excel and PDF reports can easily be shared with others. Results can also be saved to the library within the App. The Pipe Flow Gas Pressure Drop software has unrivalled functions and features: - Gas properties database for air, nitrogen, natural gas, and other compressible fluids. - Pipe material database for various Steel, Aluminium, Copper, HDPE, and other pipes. - Fitting database for standard valves and bends, with associated K factor values. - User definable custom materials, fluids and fittings. - Gas properties calculator to help with the creation of user defined gas data at a specific temperature and pressure condition. - Professional Excel and PDF reports showing calculation results. - Results verification against published data to provide confidence in the calculation results. - Configurable post decimals for display on screen and in reports. - Automatic conversion between a wide range of units. - Compatibility with Pipe Flow Wizard files for iOS, macOS and Windows. - Calculation engine based on the same reliable calculation engine that is used by Pipe Flow Software's premier Pipe Flow Expert software, which is trusted by users in over 100 countries worldwide. - High quality, reliable software, and unrivalled customer support. Pipe Flow Gas Pressure Drop is offered as as a free trial download and can be purchased for a one-time fee within the App. Terms of Use: https://www.pipeflow.com/pipe-flow-mobile-software/pipe-flow-mobile-software-license-terms

About

Mechanical Engineering Toolkit

This utility app provides a comprehensive collection of engineering equations and formulas for students and professionals. Easily perform calculations by selecting a formula and inputting variables, with detailed instructions and reference material included.

Highlights
  • Engineering equations and formulas
  • Mechanics of Material calculations
  • Theory of Elasticity formulas
  • Composite Material properties
  • Reference material
  • Variable input for calculations
Features
Read full description

Mechanical Engineering Toolkit is a professional engineering calculator for students, researchers, and practicing engineers. Choose a formula, enter your variables, and get instant results — with calculation steps, formulas, diagrams, and unit conversions shown along the way. Switch between SI and Imperial units anytime, save favorites, and find the right tool fast with recommendations by major. Save your inputs as named projects, and export any result as text, image, CSV or PDF. Categories and tools: Mechanics of Material • Moments of inertia of plane areas • Force-displacement relation of a bar • Torsion formula and angle of twist • Flexure formula of a beam • Transverse shear stress • Deflections and slopes of cantilever and simple beams • Plane stress transformation and Mohr's circle • Principal stresses and planes • Spherical shell and thin-walled pressure vessel stresses • Buckling load of a column • Thermal deformation and stress • Combined loading • Bolted / riveted joints • Fatigue safety factor • Shaft power and torque Statics • Centroid of an area • Resultant of a force system • Beam reactions • 2D truss analysis Machine Design • Helical compression springs • Spur gear geometry and stresses • Shaft fatigue design (DE-Goodman) • Bearing L10 life • Belt and chain drives • Bolt preload / torque-tension • Fillet weld strength • Press / shrink-fit interference • Shaft critical speed (Dunkerley) • Beam natural frequency (five end conditions) • Torsional natural frequency (one or two rotors) Fluids & Thermal • Reynolds number and flow regime • Pipe pressure drop (Darcy-Weisbach with Colebrook) • Pump and fan power • Composite wall conduction • Fin efficiency • Heat exchanger sizing by LMTD Theory of Elasticity • Constitutive relation of linear elastic material • Stress/strain of linear elastic material Composite Material • Lamina and laminate stress/strain • Lamina engineering constants • Laminate plane and 3D properties • Rule of mixtures • Failure criteria (Tsai-Hill, Tsai-Wu) Reference Tables • Drill & tap chart (metric and imperial thread series) • ISO 286 fits & tolerances • Standard sections (AISC W, IPE, HEB) • Unit converter No account required. Works offline. Available in English, Chinese, German, French, and Japanese.

Screenshots

Pipe Flow Gas Pressure Drop4 screens
Mechanical Engineering Toolkit4 screens

Verdict

The call

The clearest difference is ads: Pipe Flow Gas Pressure Drop at none against Mechanical Engineering Toolkit's shown. Pipe Flow Gas Pressure Drop also leads on monetization model (free vs ad-supported) and iOS requirement (11.0 vs 15.0). Mechanical Engineering Toolkit's advantage is ratings volume (64 vs 13). On price, rating, update cadence and in-app purchases 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

Both are free to download. Pipe Flow Gas Pressure Drop sells 1 one-off in-app purchase and Mechanical Engineering Toolkit sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.8 for Pipe Flow Gas Pressure Drop against 4.8 for Mechanical Engineering Toolkit. Both are backed by a comparable volume of ratings — 13 and 64 respectively.

UpkeepUpdate frequency

Pipe Flow Gas Pressure Drop ships an update fortnightly, Mechanical Engineering Toolkit every 8 days. The most recent releases landed on September 3, 2026 and September 24, 2026 respectively.

Scorecard4 real differences · 6 level
Pipe Flow Gas Pressure Drop versus Mechanical Engineering Toolkit: the parameters behind the verdict, then further details
ParameterPipe Flow Gas Pressure DropMechanical Engineering Toolkit
PriceFreeFree
Rating4.8 (13 ratings)4.8 (64 ratings)
Positive reviews—57.1% of reviews
Number of ratings1364 — better
Update frequencyFortnightlyEvery 8 days — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS11.0 — better15.0
Further details — not scored
Size67 MB38 MB
Age rating4+4+
DeveloperPipe Flow SoftwareAPPS BAY LIMITED

Customer experience

Pipe Flow Gas Pressure Drop

All ratings13 ratings
Positive100.0%
Neutral0.0%
Negative0.0%

Mechanical Engineering Toolkit

All ratings64 ratings
Positive95.3%
Neutral1.6%
Negative3.1%
Written reviews7 reviews
Positive57.1%
Neutral14.3%
Negative28.6%

In-app purchases

1 purchases

Pipe Flow Gas Pressure Drop

One-time1
  • Pipe Flow Gas Pressure Drop$4.99
1 purchases

Mechanical Engineering Toolkit

One-time1
  • Remove Ads$2.99

Questions

Is Pipe Flow Gas Pressure Drop free?
Pipe Flow Gas Pressure Drop is free to download, with in-app purchases available.
Is Mechanical Engineering Toolkit free?
Mechanical Engineering Toolkit is free to download, with in-app purchases available.
Which has better reviews, Pipe Flow Gas Pressure Drop or Mechanical Engineering Toolkit?
Pipe Flow Gas Pressure Drop and Mechanical Engineering Toolkit are both rated 4.8 out of 5 on the App Store, from 13 and 64 ratings respectively.
Do Pipe Flow Gas Pressure Drop or Mechanical Engineering Toolkit have ads?
Mechanical Engineering Toolkit shows ads; Pipe Flow Gas Pressure Drop does not.
Which is updated more often, Pipe Flow Gas Pressure Drop or Mechanical Engineering Toolkit?
Pipe Flow Gas Pressure Drop ships an update fortnightly, and Mechanical Engineering Toolkit every 8 days. Most recently, Pipe Flow Gas Pressure Drop was updated on September 3, 2026 and Mechanical Engineering Toolkit on September 24, 2026.

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