Hydraulic vs UnitsConv
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
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.
- 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
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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.
UnitsConv
This app provides conversion factors for 28 common properties used in multiphysics simulations and finite element analysis. It's a free tool designed for engineers and researchers working with complex physical models.
- 28 conversion properties
- Multiphysics simulation support
- Finite element analysis (FEA) focus
- Free to use
- Supports iPhone, iPad, and iPod
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Units conversion app with conversion factors for 28 properties commonly used in multiphysics simulations and finite element analysis (FEA).
Screenshots
Verdict
The clearest difference is in-app purchases: UnitsConv at none against Hydraulic's 2. UnitsConv also leads on rating (4.3 vs 4.1) and iOS requirement (12.0 vs 15.1). Hydraulic's advantage is update cadence (every 6 weeks vs every 4 months) and ratings volume (17 vs 3). On price, 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
Both are free to download. Hydraulic sells 2 one-off in-app purchases. UnitsConv asks for nothing beyond the download.
UnitsConv holds the better App Store score, 4.3 against 4.1. That said, the two scores are not equally well evidenced: Hydraulic has 17 ratings behind it against 3, so its average is the more settled of the two.
Hydraulic ships an update every 6 weeks, UnitsConv every 4 months. The most recent releases landed on November 1, 2026 and November 3, 2026 respectively.
| Parameter | Hydraulic | UnitsConv |
|---|---|---|
| Price | Free | Free |
| Rating | 4.1 (17 ratings) | 4.3 (3 ratings) — better |
| Positive reviews | 50.0% of reviews | — |
| Number of ratings | 17 — better | 3 |
| Update frequency | Every 6 weeks — better | Every 4 months |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Free with in-app purchases | Free — better |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 | 12.0 — better |
| Further details — not scored | ||
| Size | 24 MB | 8 MB |
| Age rating | 4+ | 4+ |
| Developer | Zanthic Automation Inc. | john selverian |
Customer experience
Hydraulic
UnitsConv
In-app purchases
Hydraulic
- Full Version$7.99
- Pro Version$7.99
UnitsConv
No in-app purchases
Questions
Is Hydraulic free?
Is UnitsConv free?
Which has better reviews, Hydraulic or UnitsConv?
Do Hydraulic or UnitsConv have ads?
Which is updated more often, Hydraulic or UnitsConv?
Other comparisons
