Comparison

Keystone Pump TDH Calculator vs HydroCalc Basic

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

Head to head
About

Keystone Pump TDH Calculator

This utility app assists engineers and technical personnel in calculating system parameters for slurry pipe and pump sizing. It computes required head pressure and limiting settling velocity based on user-inputted system data. The tool aims to simplify the selection process for slurry pumps.

Highlights
  • Slurry Density Calculation
  • Limiting Settling Velocity Calculation
  • Slurry Head & Equivalent Water Head Calculation
  • Pipe Type and Size Database
  • NPSHA Calculation
  • US and Metric Units
  • Save Calculation Results
Features
Read full description

Keystone Pumps - Keystone Pump TDH Calculator was created to assist Engineers and Technical Personnel with system calculations required for the sizing of slurry pipe systems and slurry pumps. Our program allows the user to simply enter in basic system parameters and our program will calculate the required head pressure and limiting settling velocity. Our desire is to provide our customers with a dynamic tool that allows for ease of selecting slurry pumps. Features: • Supports iOS10 • Built in Slurry Density Calculation • Limiting Settling Velocity Calculation • Slurry Head & Equivalent Water Head Calculation • Built in Pipe Type and Size Database • Entry and Saving of Customer Pipe Sizes • Built in Pipe Fittings Visual Selection Database • Entry and Saving of Custom Pipe Fittings • NPSHA Calculation • US and Metric Units • Saving of Individual Calculation Results • E-Mailing of Individual Calculation Results

About

HydroCalc Basic

Features
Read full description

Pipe Headloss Calculator provides engineers, designers, and students with powerful tools for pipeline hydraulic analysis — without the hassle of complex manual computations. Whether you’re sizing new pipelines or analyzing existing systems, the app delivers rapid, accurate results. Key Features Automatic Unit Conversion – Seamlessly switch between US Customary and SI units for length, flow, and diameter. Pipeline-Specific Inputs – Enter pipeline length, flow rate, internal diameter, and pipe material. Powerful Inverse Calculator – Set a target head loss and calculate the required diameter, flow, or length. Instantly view flow velocity, friction head loss, fitting losses, and full system curve data. With a clean interface and fast performance, this app is designed to save time and improve accuracy in hydraulic calculations — from the classroom to the field.

Screenshots

Keystone Pump TDH Calculator1 screens
HydroCalc Basic4 screens

Verdict

The call

The clearest difference is in-app purchases: Keystone Pump TDH Calculator at none against HydroCalc Basic's 1. HydroCalc Basic's advantage is update cadence (every 11 days vs every 6 months) and device support (3 vs 1). On price and ads 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. HydroCalc Basic sells 1 one-off in-app purchase. Keystone Pump TDH Calculator asks for nothing beyond the download.

UpkeepUpdate frequency

Keystone Pump TDH Calculator ships an update every 6 months, HydroCalc Basic every 11 days. The most recent releases landed on October 16, 2026 and October 29, 2026 respectively.

Scorecard4 real differences · 6 level
Keystone Pump TDH Calculator versus HydroCalc Basic: the parameters behind the verdict, then further details
ParameterKeystone Pump TDH CalculatorHydroCalc Basic
PriceFreeFree
Rating5.0 (1 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings1 — better—
Update frequencyEvery 6 monthsEvery 11 days — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFree—
DevicesiPhoneiPhone, iPad, iPod — better
Requires iOS17.615.1 — better
Further details — not scored
Size3 MB35 MB
Age rating4+4+
DeveloperKeystone Pumps LTDTransparent Blue Water LLC

In-app purchases

None

Keystone Pump TDH Calculator

No in-app purchases

1 purchases

HydroCalc Basic

One-time1
  • Pro Pack$5.99

Questions

Is Keystone Pump TDH Calculator free?
Keystone Pump TDH Calculator is free to download, with no in-app purchases.
Is HydroCalc Basic free?
HydroCalc Basic is free to download, with in-app purchases available.
Do Keystone Pump TDH Calculator or HydroCalc Basic have ads?
Neither Keystone Pump TDH Calculator nor HydroCalc Basic shows ads.
Which is updated more often, Keystone Pump TDH Calculator or HydroCalc Basic?
Keystone Pump TDH Calculator ships an update every 6 months, and HydroCalc Basic every 11 days. Most recently, Keystone Pump TDH Calculator was updated on October 16, 2026 and HydroCalc Basic on October 29, 2026.

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