Comparison

Compare Flow vs Hydraulic

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

Head to head
About

Compare Flow

This application helps engineers and designers evaluate the hydraulic flow capacity of various non-pressure sewer pipe types. It allows for comparisons between different pipe geometries and materials, including concrete, thermoplastic, and metal options.

Highlights
  • Manning's Formula calculation
  • Compare hydraulic flow capacity
  • Evaluate pipe geometry alternatives
  • Compare pipe material options
  • Supports concrete, thermoplastic, and metal pipes
  • Circular, elliptical, arch, and box sections
Features
Read full description

Compare Flow app uses Manning's Formula, the most widely accepted formula for evaluating the hydraulic capacity of non-pressure sewers. In order to evaluate possible alternatives in either pipe geometry or material, use this app to compare the hydraulic flow capacity among various concrete pipes including circular, elliptical, arch and box sections with circular thermoplastic and corrugated metal pipes.

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.

Screenshots

Compare Flow4 screens
Hydraulic4 screens

Verdict

The call

The clearest difference is in-app purchases: Compare Flow at none against Hydraulic's 2. Compare Flow also leads on rating (4.6 vs 4.2). Hydraulic's advantage is update cadence (every 6 weeks vs every 32 months) and ratings volume (16 vs 5). On price, review sentiment, 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. Compare Flow asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Compare Flow holds the better App Store score, 4.6 against 4.2. Both are backed by a comparable volume of ratings — 5 and 16 respectively. Written reviews split almost evenly too, at 50% and 50% positive.

UpkeepUpdate frequency

Compare Flow ships an update every 32 months, Hydraulic every 6 weeks. The most recent releases landed on September 17, 2026 and June 4, 2026 respectively.

Scorecard5 real differences · 5 level
Compare Flow versus Hydraulic: the parameters behind the verdict, then further details
ParameterCompare FlowHydraulic
PriceFreeFree
Rating4.6 (5 ratings) — better4.2 (16 ratings)
Positive reviews50.0% of reviews50.0% of reviews
Number of ratings516 — better
Update frequencyEvery 32 monthsEvery 6 weeks — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.115.1
Further details — not scored
Size23 MB24 MB
Age rating4+4+
DeveloperiENGINEERING CorporationZanthic Automation Inc.

Customer experience

Compare Flow

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%
Written reviews2 reviews
Positive50.0%
Neutral50.0%
Negative0.0%

Hydraulic

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

In-app purchases

None

Compare Flow

No in-app purchases

2 purchases

Hydraulic

One-time2
  • Full Version$7.99
  • Pro Version$7.99

Questions

Is Compare Flow free?
Compare Flow is free to download, with no in-app purchases.
Is Hydraulic free?
Hydraulic is free to download, with in-app purchases available.
Which has better reviews, Compare Flow or Hydraulic?
Compare Flow is rated higher. Compare Flow averages 4.6 out of 5 from 5 ratings, while Hydraulic averages 4.2 from 16 ratings.
Do Compare Flow or Hydraulic have ads?
Neither Compare Flow nor Hydraulic shows ads.
Which is updated more often, Compare Flow or Hydraulic?
Compare Flow ships an update every 32 months, and Hydraulic every 6 weeks. Most recently, Compare Flow was updated on September 17, 2026 and Hydraulic on June 4, 2026.

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