Comparison

Hydraulic vs TESS Services

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

TESS Services

Features
Read full description

TESS Services makes it easier to submit safety tests and simplifies workflow.

Screenshots

Hydraulic4 screens
TESS Services1 screens

Verdict

The call

The clearest difference is in-app purchases: TESS Services at none against Hydraulic's 2. TESS Services also leads on iOS requirement (11.0 vs 15.1). Hydraulic's advantage is update cadence (every 6 weeks vs every 13 months). 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

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Hydraulic sells 2 one-off in-app purchases. TESS Services asks for nothing beyond the download.

UpkeepUpdate frequency

Hydraulic ships an update every 6 weeks, TESS Services every 13 months. The most recent releases landed on October 20, 2026 and October 7, 2026 respectively.

Scorecard3 real differences · 7 level
Hydraulic versus TESS Services: the parameters behind the verdict, then further details
ParameterHydraulicTESS Services
PriceFreeFree
Rating4.1 (17 ratings) — better—
Positive reviews50.0% of reviews—
Number of ratings17 — better—
Update frequencyEvery 6 weeks — betterEvery 13 months
AdsNoNo
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.111.0 — better
Further details — not scored
Size24 MB163 MB
Age rating4+4+
DeveloperZanthic Automation Inc.TESS as

In-app purchases

2 purchases

Hydraulic

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

TESS Services

No in-app purchases

Questions

Is Hydraulic free?
Hydraulic is free to download, with in-app purchases available.
Is TESS Services free?
TESS Services is free to download, with no in-app purchases.
Do Hydraulic or TESS Services have ads?
Neither Hydraulic nor TESS Services shows ads.
Which is updated more often, Hydraulic or TESS Services?
Hydraulic ships an update every 6 weeks, and TESS Services every 13 months. Most recently, Hydraulic was updated on October 20, 2026 and TESS Services on October 7, 2026.

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