Comparison

Pypley vs Pipe Flow Liquid Pipe Diameter

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

Head to head
About

Pypley

This app calculates flow rate, pressure drop, and pump performance for circular pipe systems. It supports custom pumps and fittings, and allows for unit conversions between Metric and US Imperial. Ideal for hydraulic and process engineers for early-stage design and quick estimations.

Highlights
  • Flow rate and pressure drop calculation
  • Customizable pump and fitting database
  • Metric/Imperial unit conversion
  • Pump performance curve plotting
  • Cavitation risk assessment (NPSH)
  • Reynolds number and friction factor calculation
Features
Read full description

Pypley calculates flow rate, pressure drop, and pump performance for circular pipe systems with Newtonian liquids. Build serial pipe systems using a pump database, fittings, and valves, with support for custom pumps and fittings stored via iCloud. Designed for hydraulic and process engineers, Pypley supports early-stage design and quick estimations. Key Features: * Converts all project parameters between Metric and US Imperial units. * Calculates flow rate, pipe velocity, and pressure drop in pipes. * Generates pressure loss tables for fittings and pipes in the system. * Includes native and customizable pump database. * Adjusts pump performance via speed (RPM) and impeller diameter. * Plots pump and system performance curves. * Computes K values for fittings using 3K and 2K methods. * Determines Reynolds number for each pipe diameter. * Calculates pipe friction factor using the Colebrook equation. * Reports pump discharge pressure and pressure at each pipe’s start. * Evaluates NPSHr and NPSHa to assess pump cavitation risk. * Supports custom fitting lists with Kv/Cv coefficients or pressure/flow data. * Detects negative pressure in pipelines. * Identifies when centrifugal pumps reach maximum flow capacity. * Organises projects chronologically, with newest first. * Provides an expanded pipe material library with enhanced data. Pypley is a design tool for hydraulic and process applications, ideal for initial designs or rapid calculations. Note: Pypley does not support parallel or network flow analysis. Disclaimer: While we strive for accuracy and will address any issues, the developer is not liable for errors or omissions in Pypley’s calculations.

About

Pipe Flow Liquid Pipe Diameter

This app calculates the minimum internal pipe diameter required for a specific flow rate and maximum pressure loss. It offers comprehensive results, customizable databases for materials and fluids, and generates professional reports.

Highlights
  • Pipe diameter calculation
  • Friction loss calculation
  • Customizable material and fluid databases
  • Imperial and Metric unit support
  • Professional Excel and PDF reports
  • Results verification against published data
Features
Read full description

Pipe Flow Liquid Pipe Diameter is a pipe sizing calculator app from Pipe Flow Software that calculates the minimum internal pipe diameter needed for a given flow rate at a specified maximum pressure loss. Pipe Flow Software applications are used by engineers in over 100 countries worldwide. The Pipe Diameter App has an intuitive user interface that allows for easy entry of the input data, including changes in elevation, and selection of valves & fittings. Comprehensive results include Reynolds number, friction factor, friction losses, fitting losses, fluid velocities and more. Each result is clearly displayed using expandable sections that reveal further information as needed. Users can select pipe materials, pipe diameters, pipe fittings (k factors) and liquids from the integrated databases, and these can also be extended with user specific data for custom pipe materials, diameters, fittings, and liquids. The App can operate in Imperial or Metric units and each individual field can be further customised to use a specific unit. Results values can be displayed to a specified number of decimal places. Pipe Flow Liquid Pipe Diameter calculation results have been verified against multiple cases of published data from well known sources. The results of these calculations are included in the Results Verification PDF document which can be accessed from within the App. Engineers can easily perform their pipe sizing calculations in the office or on site. Professional Excel and PDF reports can easily be shared with others. Results can also be saved to the library within the App. The Pipe Flow Liquid Pipe Diameter software has unrivalled functions and features: - Liquid properties database for water, oils, acids, and other fluids. - Pipe material database for various Steel, Aluminium, Copper, HDPE, and other pipes. - Fitting database for standard valves and bends, with associated K factor values. - User definable custom materials, fluids and fittings. - Professional Excel and PDF reports showing calculation results. - Results verification against published data to provide confidence in the calculation results. - Configurable post decimal places for display on screen and in reports. - Automatic conversion between a wide range of units. - Compatibility with Pipe Flow Wizard files for iOS, macOS and Windows. - Calculation results based on the same reliable calculation engine that is used by Pipe Flow Software's premier Pipe Flow Expert software, which is trusted by users in over 100 countries worldwide. - High quality, reliable software, and unrivalled customer support. Pipe Flow Liquid Pipe Diameter is offered as a free trial download and can be purchased for a one-time fee within the App. Terms of Use: https://www.pipeflow.com/pipe-flow-mobile-software/pipe-flow-mobile-software-license-terms

Screenshots

Pypley4 screens
Pipe Flow Liquid Pipe Diameter4 screens

Verdict

The call

The clearest difference is price: Pipe Flow Liquid Pipe Diameter at Free against Pypley's $2.99. Pipe Flow Liquid Pipe Diameter also leads on rating (4.6 vs 1.0) and ratings volume (5 vs 1). Pypley's advantage is in-app purchases (none vs 1). On 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

Pipe Flow Liquid Pipe Diameter is free to download; Pypley costs $2.99 up front. Pipe Flow Liquid Pipe Diameter sells 1 one-off in-app purchase. Pypley asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Pipe Flow Liquid Pipe Diameter holds the better App Store score, 4.6 against 1.0. That said, the two scores are not equally well evidenced: Pipe Flow Liquid Pipe Diameter has 5 ratings behind it against 1, so its average is the more settled of the two.

UpkeepUpdate frequency

Pypley ships an update every 3 weeks, Pipe Flow Liquid Pipe Diameter fortnightly. The most recent releases landed on October 8, 2026 and October 11, 2026 respectively.

Scorecard6 real differences · 4 level
Pypley versus Pipe Flow Liquid Pipe Diameter: the parameters behind the verdict, then further details
ParameterPypleyPipe Flow Liquid Pipe Diameter
Price$2.99Free — better
Rating1.0 (1 ratings)4.6 (5 ratings) — better
Positive reviews83.3% of reviews—
Number of ratings15 — better
Update frequencyEvery 3 weeksFortnightly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationPaidFree with in-app purchases — better
DevicesiPhone, iPodiPhone, iPad, iPod — better
Requires iOS13.011.0 — better
Further details — not scored
Size4 MB67 MB
Age rating4+4+
DeveloperAli MohammedPipe Flow Software

Customer experience

Pypley

All ratings1 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews6 reviews
Positive83.3%
Neutral0.0%
Negative16.7%

Pipe Flow Liquid Pipe Diameter

All ratings5 ratings
Positive80.0%
Neutral20.0%
Negative0.0%

In-app purchases

None

Pypley

No in-app purchases

1 purchases

Pipe Flow Liquid Pipe Diameter

One-time1
  • Pipe Flow Pipe Diameter$4.99

Questions

Is Pypley free?
Pypley costs $2.99, with no in-app purchases.
Is Pipe Flow Liquid Pipe Diameter free?
Pipe Flow Liquid Pipe Diameter is free to download, with in-app purchases available.
Which has better reviews, Pypley or Pipe Flow Liquid Pipe Diameter?
Pipe Flow Liquid Pipe Diameter is rated higher. Pypley averages 1.0 out of 5 from 1 ratings, while Pipe Flow Liquid Pipe Diameter averages 4.6 from 5 ratings.
Do Pypley or Pipe Flow Liquid Pipe Diameter have ads?
Neither Pypley nor Pipe Flow Liquid Pipe Diameter shows ads.
Which is updated more often, Pypley or Pipe Flow Liquid Pipe Diameter?
Pypley ships an update every 3 weeks, and Pipe Flow Liquid Pipe Diameter fortnightly. Most recently, Pypley was updated on October 8, 2026 and Pipe Flow Liquid Pipe Diameter on October 11, 2026.

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