Comparison

Pypley vs TSI Flowmeter

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

TSI Flowmeter

Features
Read full description

Precision in Water Flow Management With over 20 years' experience, TSI Flowmeters are the market leaders in providing innovative water management and delivery solutions to Water Utilities, Municipal and Fire and Rescue Services. Our unique water flow management technology utilizes electromagnetic technology to provide constant, accurate information over a wide range of flow (30-5000 LPM) on a clear and easy-to-read digital display. We use the latest in water flow meter technology to support greater fire fighter safety, efficiency, and environmental outcomes. We do this by transforming thinking about the way water is managed, giving you greater control over operational planning.

Screenshots

Pypley4 screens
TSI Flowmeter3 screens

Verdict

The call

The clearest difference is price: TSI Flowmeter at Free against Pypley's $2.99. Pypley's advantage is iOS requirement (13.0 vs 16.0). On update cadence, ads, in-app purchases 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

TSI Flowmeter is free to download; Pypley costs $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Pypley ships an update every 3 weeks, TSI Flowmeter monthly. The most recent releases landed on October 8, 2026 and October 20, 2026 respectively.

Scorecard2 real differences · 8 level
Pypley versus TSI Flowmeter: the parameters behind the verdict, then further details
ParameterPypleyTSI Flowmeter
Price$2.99Free — better
Rating1.0 (1 ratings) — better—
Positive reviews83.3% of reviews—
Number of ratings1 — better—
Update frequencyEvery 3 weeks — betterMonthly
AdsNoNo
In-app purchasesNoNo
MonetizationPaid—
DevicesiPhone, iPod — betteriPhone
Requires iOS13.0 — better16.0
Further details — not scored
Size4 MB51 MB
Age rating4+4+
DeveloperAli MohammedTSI Flowmeters Ltd

In-app purchases

None

Pypley

No in-app purchases

None

TSI Flowmeter

No in-app purchases

Questions

Is Pypley free?
Pypley costs $2.99, with no in-app purchases.
Is TSI Flowmeter free?
TSI Flowmeter is free to download, with no in-app purchases.
Do Pypley or TSI Flowmeter have ads?
Neither Pypley nor TSI Flowmeter shows ads.
Which is updated more often, Pypley or TSI Flowmeter?
Pypley ships an update every 3 weeks, and TSI Flowmeter monthly. Most recently, Pypley was updated on October 8, 2026 and TSI Flowmeter on October 20, 2026.

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