Comparison

Hydraulic vs Engine Calculator Plus

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

Head to head
About

Hydraulic

Perform essential hydraulic calculations for cylinders, pumps, and fluid lines. Solve for forces, speeds, torque, power, and pressure drop. Supports metric and imperial units, with advanced features unlocked via in-app purchase.

Highlights
  • Cylinder force and speed calculations
  • Pump displacement, flow, and pressure calculations
  • Hydraulic line fluid velocity and pressure drop
  • Orifice flow and pressure calculations
  • Speed, torque, and power calculations
  • Metric and imperial unit support
  • Copy results to clipboard
Features
Read full description

The Hydraulic Calculator includes many basic hydraulic calculations. Cylinder calculations can be done to solve for extension / retraction forces or speeds. Pump calculations can also be done by entering combinations of displacement, oil flow and pressure to determine values for speed, torque and power. Both mechanical and volumetric efficiencies can be used in these calculations. Hydraulic line calculations can also be done for fluid velocity, cross sectional area, Reynolds number and pressure drop. The free version is limited to 1” or 25mm line diameters. Orifice calculations can also be made using three parameters: Oil Flow, Orifice Diameter and Pressure Drop. Enter any two values and have the third calculated. Speed - Torque - Power page: Enter any two values have the third calculated. Unit conversions built into the page. Calculations can be done in either metric or imperial units. Basic unit conversions are also available. With the in-app purchase, all features from the Hydraulic Calculator will become active: Cylinder characteristics can be entered in a number of different ways. Enter hydraulic flow, cylinder velocity, or stroke time and calculate the other two. User can also enter Hydraulic pressure, extend force or retract force and have the other two calculated. One application for this is to measure the stroke time of a cylinder. By entering this with the bore diameter and stroke length, the system flow is calculated. Full motor & pump calculation page. The motor & pump calculator are flexible tools in which the user can enter any three known values to have the remaining values calculated. Values include: displacement, oil flow, pressure, rotational speed, torque, and motor power. Both mechanical and volumetric efficiency values are used. Results can be copied to the clipboard in a text format for use in e-mails, messages, or other documentation.

About

Engine Calculator Plus

Calculate engine specifications for various car and plane engines, including displacement, compression ratio, and horsepower. Supports metric and imperial systems with a user-friendly interface and 3D engine visualization.

Highlights
  • Engine displacement calculation
  • Compression ratio calculation
  • Horsepower estimation
  • Metric and Imperial support
  • 3D engine display
  • Copyable results
Features
Read full description

Engine Calculator Plus is designed to help you figure out engine specs for all car or plane engine types from inline 4 to V12 Engine. This calculator provides calculations for engine displacement based on either the metric or US standard system. Features: - User friendly UI - Engine type selection from single cylinder to complex W16 or even custom cylinder count. - Display 3D engine from selection - Metric or Imperial input - Output Engine Displacement on cc, liter and cubic inch - Output Compression ratio of engine - Calculate estimate horse power in HP and Kilowatts - Include formula to calculate the engine displacement in help page - Result are copy-able to other app The engine's static compression ratio is easily calculated if you know six measurements or volumes: Bore - The diameter of the cylinder bore Stroke - The distance the piston travels in the cylinder Deck Height - The distance between the top of the cylinder bore and the top of the piston, when the piston is at TDC (Top Dead Center, or at its highest position) Piston top volume - If the piston is dished, domed, or dimpled, that has an affect on compression ratio. Combustion chamber volume - How much open space is in the head above the cylinder Compression ratios: Higher compression ratios cylinder produces better power and fuel economy. It is not just because the charge is squeezed harder and the resulting combustion pressure goes up, but also because the higher expansion ratio allows more energy to be extracted from the original high-pressure. High compression ratio engines burn both much more cleanly and much more efficiently than lower-compression engines. However a lower compression motor will let you run cheap fuel, but your motor won't be as efficient, less efficient and less power. *Thanks for your support, stay tune for more update to come.

Screenshots

Hydraulic4 screens
Engine Calculator Plus4 screens

Verdict

The call

The clearest difference is price: Hydraulic at Free against Engine Calculator Plus's $2.99. Hydraulic also leads on review sentiment (50% vs 13%) and update cadence (every 6 weeks vs every 48 months). Engine Calculator Plus's advantage is in-app purchases (none vs 2) and chart position (#183 vs unranked). On 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 is free to download; Engine Calculator Plus costs $2.99 up front. Hydraulic sells 2 one-off in-app purchases. Engine Calculator Plus asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Hydraulic holds the better App Store score, 4.2 against 4.0. That said, the two scores are not equally well evidenced: Hydraulic has 16 ratings behind it against 1, so its average is the more settled of the two. Written reviews point the same way: 50% of Hydraulic's written reviews are positive against 13% of Engine Calculator Plus's.

UpkeepUpdate frequency

Hydraulic ships an update every 6 weeks, Engine Calculator Plus every 48 months. The most recent releases landed on June 4, 2026 and September 10, 2026 respectively.

Scorecard9 real differences · 2 level
Hydraulic versus Engine Calculator Plus: the parameters behind the verdict, then further details
ParameterHydraulicEngine Calculator Plus
PriceFree — better$2.99
Rating4.2 (16 ratings) — better4.0 (1 ratings)
Positive reviews50.0% of reviews — better12.5% of reviews
Number of ratings16 — better1
Update frequencyEvery 6 weeks — betterEvery 48 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases — betterPaid
Best chart rank—#183 — better
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113 — better
Further details — not scored
Size24 MB2 MB
Age rating4+4+
DeveloperZanthic Automation Inc.Nitrio

Customer experience

Hydraulic

All ratings16 ratings
Positive81.3%
Neutral12.5%
Negative6.3%
Written reviews8 reviews
Positive50.0%
Neutral0.0%
Negative50.0%

Engine Calculator Plus

All ratings1 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews8 reviews
Positive12.5%
Neutral0.0%
Negative87.5%

In-app purchases

2 purchases

Hydraulic

One-time2
  • Full Version$7.99
  • Pro Version$7.99
None

Engine Calculator Plus

No in-app purchases

Questions

Is Hydraulic free?
Hydraulic is free to download, with in-app purchases available.
Is Engine Calculator Plus free?
Engine Calculator Plus costs $2.99, with no in-app purchases.
Which has better reviews, Hydraulic or Engine Calculator Plus?
Hydraulic is rated higher. Hydraulic averages 4.2 out of 5 from 16 ratings, while Engine Calculator Plus averages 4.0 from 1 ratings.
Do Hydraulic or Engine Calculator Plus have ads?
Neither Hydraulic nor Engine Calculator Plus shows ads.
Which is updated more often, Hydraulic or Engine Calculator Plus?
Hydraulic ships an update every 6 weeks, and Engine Calculator Plus every 48 months. Most recently, Hydraulic was updated on June 4, 2026 and Engine Calculator Plus on September 10, 2026.

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