Comparison

Fluid Mechanics Calc 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

Fluid Mechanics Calc

This utility app provides a comprehensive calculator for fluid mechanics, civil, and structural engineering parameters. It offers over 130 formulas and 360 calculation methods, supporting seamless unit system switching for analysis, design, and operation of fluid-related systems.

Highlights
  • 130+ fluid mechanics formulas
  • 360+ calculation methods
  • Unit system conversion (metric/US)
  • Favorite formula marking
  • High mathematical precision
  • Seamless unit switching
Features
Read full description

The app is useful for the fluid thinkers. This app covers a wide variety of topics and helps in analysis, design, maintenance and operation of fluid related systems. The calculator will provide results for different fluid mechanics, civil, structural, pipe flow and engineering parameters. It is useful in the fields of automotive, aviation, geology, space, biological applications, petroleum, marine systems and cylinder manufacturing. This app comes handy to students, engineers, analysts, researchers and the curious. Here are the useful features of this app LISTS 130+ FORMULAE Memorizing hundreds of formula is not the way to go when it comes to learning fluid mechanics 360+ METHODS OF CALCULATION This calculator allows a user to change subject of formula based on the variable he/she wants to calculate. The formula applied is displayed in the app CALCULATE FOR ANSWERS Key in the numbers, set units and see results. Switch upto three conversion units. The app accepts input and provides results to the highest mathematical precision MARK FAVORITES Easy markups for easy recall HOP SEAMLESSLY BETWEEN BETWEEN METRIC AND US (INCH) UNIT SYSTEMS The app maintains separate functioning of these unit systems. The app has a predefined library of units designated to each of them It would be a good idea to kill the app and re-open it once in a while with the internet. We constantly strive to update, increase and enrich the content of the app. Go fluid with this app in your pocket!

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

Fluid Mechanics Calc4 screens
Mechanical Engineering Toolkit4 screens

Verdict

The call

The clearest difference is in-app purchases: Fluid Mechanics Calc at none against Mechanical Engineering Toolkit's 1. Fluid Mechanics Calc also leads on ads (none vs shown) and rating (5.0 vs 4.8). Mechanical Engineering Toolkit's advantage is update cadence (every 8 days vs every 22 months) and ratings volume (64 vs 3). On price, device support 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

Both are free to download. Mechanical Engineering Toolkit sells 1 one-off in-app purchase. Fluid Mechanics Calc asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Fluid Mechanics Calc holds the better App Store score, 5.0 against 4.8. That said, the two scores are not equally well evidenced: Mechanical Engineering Toolkit has 64 ratings behind it against 3, so its average is the more settled of the two.

UpkeepUpdate frequency

Fluid Mechanics Calc ships an update every 22 months, Mechanical Engineering Toolkit every 8 days. The most recent releases landed on September 19, 2026 and September 24, 2026 respectively.

Scorecard6 real differences · 4 level
Fluid Mechanics Calc versus Mechanical Engineering Toolkit: the parameters behind the verdict, then further details
ParameterFluid Mechanics CalcMechanical Engineering Toolkit
PriceFreeFree
Rating5.0 (3 ratings) — better4.8 (64 ratings)
Positive reviews—57.1% of reviews
Number of ratings364 — better
Update frequencyEvery 22 monthsEvery 8 days — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterAd-supported
DevicesiPhone, iPad, iPodiPhone, iPad, iPod, Mac — better
Requires iOS15.615.0 — better
Further details — not scored
Size108 MB38 MB
Age rating4+4+
DeveloperTrelleborg Sealing SolutionsAPPS BAY LIMITED

Customer experience

Fluid Mechanics Calc

All ratings3 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

None

Fluid Mechanics Calc

No in-app purchases

1 purchases

Mechanical Engineering Toolkit

One-time1
  • Remove Ads$2.99

Questions

Is Fluid Mechanics Calc free?
Fluid Mechanics Calc is free to download, with no in-app purchases.
Is Mechanical Engineering Toolkit free?
Mechanical Engineering Toolkit is free to download, with in-app purchases available.
Which has better reviews, Fluid Mechanics Calc or Mechanical Engineering Toolkit?
Fluid Mechanics Calc is rated higher. Fluid Mechanics Calc averages 5.0 out of 5 from 3 ratings, while Mechanical Engineering Toolkit averages 4.8 from 64 ratings.
Do Fluid Mechanics Calc or Mechanical Engineering Toolkit have ads?
Mechanical Engineering Toolkit shows ads; Fluid Mechanics Calc does not.
Which is updated more often, Fluid Mechanics Calc or Mechanical Engineering Toolkit?
Fluid Mechanics Calc ships an update every 22 months, and Mechanical Engineering Toolkit every 8 days. Most recently, Fluid Mechanics Calc was updated on September 19, 2026 and Mechanical Engineering Toolkit on September 24, 2026.

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