Comparison

Hydraulic Engineer vs Hydraulic System Calculator

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

Head to head
About

Hydraulic Engineer

This comprehensive calculator app offers over 1,000 hydraulic engineering formulas across 13 categories. It includes temperature conversions, reference tables, and the ability to save and share calculations. Works offline and supports both US Customary and SI Metric units.

Highlights
  • Over 1,000 hydraulic formulas
  • 13 specialized calculator categories
  • Temperature scale converters
  • Professional reference tables
  • Save and share calculations
  • Works offline
  • US Customary and SI Metric units
Features
Read full description

HYDRAULIC ENGINEER is the most comprehensive hydraulic engineering calculator available on the App Store, featuring over 1,000 formulas across 13 specialized calculator categories, 8 temperature scale converters, and 8 professional reference tables. CALCULATOR CATEGORIES - Actuator Formulas — cylinder force, stroke, speed, and rod calculations - Fluid Power — pressure, flow, horsepower, and torque calculations - Pump Laws — affinity laws for speed, flow, pressure, and power - Vehicle Drive — drive speed, tractive effort, gradeability, and drawbar pull - Hydraulic Tubing — wall thickness, burst pressure, and working pressure - Cylinder Calculations — extend/retract speed, rod end area, and cycle times - Thermal Hydraulics — heat generation, reservoir cooling, heat exchangers, and energy to heat fluid - Oil Velocity & Pressure Loss — pipe velocity, pressure drop per foot, and total system losses - Pipe Flow — Reynolds number, Darcy-Weisbach head loss, laminar friction, and orifice flow - Accumulator Sizing — discharge volume, precharge pressure, adiabatic and isothermal gas volumes - Reservoir Sizing — open/closed circuit sizing, cylinder-based sizing, and oil weight calculations - AC/DC Electrical — Ohm's law, power, resistance, inductance, and motor selection - Area Formulas — 60 geometric area calculations for every common shape 700+ CONVERSION FORMULAS Pressure, horsepower, BTU, flow rates, linear measure, square measure, cubic measure, liquid measure, weights, watts, power, HVAC, metric, sand-to-volume, and fraction conversions. 8 TEMPERATURE SCALES Convert between Celsius, Fahrenheit, Kelvin, Rankine, Reaumur, Newton, Delisle, and Romer — 56 conversion formulas covering every combination. 8 PROFESSIONAL REFERENCE TABLES - Pipe Schedule (Schedule 40 & 80) - ISO Viscosity Grades - Recommended Flow Velocities - Hydraulic Hose Sizing (SAE) - JIC Thread Sizes - Pipe Roughness Values - O-Ring Sizes (AS568) - Wire Rope Working Load Limits KEY FEATURES - Save and share any calculation result - Share reference tables - Calculation history - Favorites for quick access to your most-used formulas - Switch between US Customary and SI Metric units - Dual-unit display shows both US and metric values simultaneously - Dark mode optimized interface - Works offline — no internet connection required PREMIUM UPGRADE Unlock sharing, advanced calculator sections, and unlimited history with a one-time lifetime purchase — no subscriptions. HYDRAULIC ENGINEER is designed for working hydraulic engineers, technicians, maintenance professionals, and engineering students. If there are formulas or reference tables you'd like to see added, just use the built-in feedback feature to let us know.

About

Hydraulic System Calculator

Calculate key parameters for hydraulic cylinders, pumps, motors, and pipes. Design individual components, view formulas, and switch between metric and imperial units for precise engineering.

Highlights
  • Calculate cylinder, pump, and motor parameters
  • Design single/double-acting cylinders
  • View and switch units (Metric/Imperial)
  • Calculate piping parameters
  • Dynamic result updates
  • Copy and share results
Features
Read full description

The Hydraulic System Calculator is an intuitive tool for people working with hydraulic cylinders, pumps, motors and pipes. This app enables design of individual hydraulic components around single-acting or double-acting cylinders. A user can look into the formulas involved and switch to their preferred units. Features at a glance: - By entering the requisite dimensions of the cylinder and parameters like the pressure and oil flow the user would be able to calculate the areas & volumes in the cylinder, extraction & retraction forces, velocity, time, outflow and ratio. The output is derived on both the piston and rod side of the cylinder - A backward compatibility is also provided on some of the parameters (force, time & velocity) in the cylinder area to provide users with the extension of using the calculator in more user friendly environment - The app enables the calculation of flow rate, pressure, displacement, speed, torque and power in Motor section - The app enables the calculation of displacement, flow rate, electric motor power and total efficiency in Pump section - The app can be used to calculate pressure drop around an orifice - Piping parameters like velocity, cross-sectional area and reynolds number can be calculated using absolute or kinematic viscosity - The calculations can be carried out in both Metric or Imperial units - The data provided is in conformation with ISO 3320, ISO 3321 and ISO 4393 in the cylinder section - The calculator is built to dynamically update the results as the user keys in the values - The input and output values could be displayed in preferred sub-units as per the requirements of the user after the calculation is carried out. It also helps the user to make specific changes in units before the calculations - Interactive images on cylinder section provides the user with a good understanding of the component - The results can be copied to clipboard and can be shared via e-mail

Screenshots

Hydraulic Engineer4 screens
Hydraulic System Calculator4 screens

Verdict

The call

The clearest difference is price: Hydraulic System Calculator at Free against Hydraulic Engineer's $4.99. Hydraulic System Calculator also leads on in-app purchases (none vs 1) and ratings volume (3 vs 1). Hydraulic Engineer's advantage is review sentiment (25% vs 0%) and chart position (#137 vs unranked). On rating, update cadence, ads 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

Hydraulic System Calculator is free to download; Hydraulic Engineer costs $4.99 up front. Hydraulic Engineer sells 1 one-off in-app purchase. Hydraulic System Calculator asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

On the App Store both sit at effectively the same score — 4.0 for Hydraulic Engineer against 4.0 for Hydraulic System Calculator. Both are backed by a comparable volume of ratings — 1 and 3 respectively. Written reviews are what separate them: 25% of Hydraulic Engineer's written reviews are positive against 0% of Hydraulic System Calculator's.

UpkeepUpdate frequency

Hydraulic Engineer ships an update every 6 months, Hydraulic System Calculator every 7 months. The most recent releases landed on October 30, 2026 and September 30, 2026 respectively.

Scorecard7 real differences · 4 level
Hydraulic Engineer versus Hydraulic System Calculator: the parameters behind the verdict, then further details
ParameterHydraulic EngineerHydraulic System Calculator
Price$4.99Free — better
Rating4.0 (1 ratings)4.0 (3 ratings)
Positive reviews25.0% of reviews — better0.0% of reviews
Number of ratings13 — better
Update frequencyEvery 6 months — betterEvery 7 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationPaidFree — better
Best chart rank#137 — better—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.614.0 — better
Further details — not scored
Size19 MB94 MB
Age rating4+4+
DeveloperHistorycentral.comTrelleborg Sealing Solutions

Customer experience

Hydraulic Engineer

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive25.0%
Neutral25.0%
Negative50.0%

Hydraulic System Calculator

All ratings3 ratings
Positive66.7%
Neutral0.0%
Negative33.3%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Hydraulic Engineer

One-time1
  • Hydraulic Pro$3.99
None

Hydraulic System Calculator

No in-app purchases

Questions

Is Hydraulic Engineer free?
Hydraulic Engineer costs $4.99, and also offers in-app purchases.
Is Hydraulic System Calculator free?
Hydraulic System Calculator is free to download, with no in-app purchases.
Which has better reviews, Hydraulic Engineer or Hydraulic System Calculator?
Hydraulic Engineer and Hydraulic System Calculator are both rated 4.0 out of 5 on the App Store, from 1 and 3 ratings respectively.
Do Hydraulic Engineer or Hydraulic System Calculator have ads?
Neither Hydraulic Engineer nor Hydraulic System Calculator shows ads.
Which is updated more often, Hydraulic Engineer or Hydraulic System Calculator?
Hydraulic Engineer ships an update every 6 months, and Hydraulic System Calculator every 7 months. Most recently, Hydraulic Engineer was updated on October 30, 2026 and Hydraulic System Calculator on September 30, 2026.

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