Comparison

HydroCalc Basic vs Unit Converter Engineering Pro

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

Head to head
About

HydroCalc Basic

Features
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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.

About

Unit Converter Engineering Pro

This app provides precise unit conversions for engineers, scientists, and students. It supports over 100 units across 35 categories, including scientific notation and 9-digit decimal precision. The tool works offline and adheres to SI, NIST, and ISO standards.

Highlights
  • Over 100 units in 35+ categories
  • Scientific notation support
  • 9-digit decimal precision
  • SI, NIST, ISO compliant
  • Offline functionality
  • Specialized units included
Features
Read full description

Unit Converter Engineering Pro – The ultimate tool for engineers, scientists, and students who need precise and fast unit conversions. Easily convert between over 100 units across more than 35 categories commonly used in engineering, physics, chemistry, and mathematics. Perfect for professionals, researchers, and students who want a reliable, professional-grade converter at their fingertips. Included categories: • Acceleration • Angle • Area • Specific Heat • Electric Charge • Heat Transfer Coefficient • Length • Concentration • Thermal Conductivity • Physical Constants • Density • Diffusivity • Energy • Heat Flux • Force • Illuminance • Luminance • Mass • Moment / Torque • Power • ppm / ppb / ppt / % • SI Prefix • Pressure • Radiation – Activity • Radiation – Dose • Radiation – Exposure • Radiation – Equivalent Dose • Time • Volume • Velocity / Speed • Viscosity • Volume Flow Rate • Voltage / Electric Potential • Frequency • Temperature Key Features: • Supports scientific notation for extreme precision • Fully compliant with SI, NIST, and ISO standards • 9-digit decimal precision for engineering-grade accuracy • Fast and intuitive interface • Works offline – no internet required • Includes rare and specialized units often missing from other converters • Made by engineers, for engineers Simplify your work, save time, and ensure accuracy with Unit Converter Engineering Pro - your professional unit conversion companion. EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

HydroCalc Basic4 screens
Unit Converter Engineering Pro3 screens

Verdict

The call

The clearest difference is iOS requirement: Unit Converter Engineering Pro at 13.0 against HydroCalc Basic's 15.1. On price, update cadence, ads and in-app purchases 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 and Unit Converter Engineering Pro sells 2 in-app purchases, starting at $5.99 per 7 days. Whichever you choose, the download price is not the number that matters.

UpkeepUpdate frequency

HydroCalc Basic ships an update every 11 days, Unit Converter Engineering Pro weekly. The most recent releases landed on October 4, 2026 and September 15, 2026 respectively.

Scorecard1 real difference · 8 level
HydroCalc Basic versus Unit Converter Engineering Pro: the parameters behind the verdict, then further details
ParameterHydroCalc BasicUnit Converter Engineering Pro
PriceFreeFree
Rating—5.0 (1 ratings) — better
Number of ratings—1 — better
Update frequencyEvery 11 daysWeekly — better
AdsNoNo
In-app purchasesYesYes
Monetization—Free with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.113.0 — better
Further details — not scored
Size35 MB77 MB
Age rating4+4+
DeveloperTransparent Blue Water LLCKaiguri Tech

In-app purchases

1 purchases

HydroCalc Basic

One-time1
  • Premium - Flow Units & Ad-Free$1.99
2 purchases

Unit Converter Engineering Pro

Subscriptions2
  • 3-Day Trial3 Days trial$5.997 Days
  • Yearly Plan$19.991 Year

Questions

Is HydroCalc Basic free?
HydroCalc Basic is free to download, with in-app purchases available.
Is Unit Converter Engineering Pro free?
Unit Converter Engineering Pro is free to download, with in-app purchases available.
Do HydroCalc Basic or Unit Converter Engineering Pro have ads?
Neither HydroCalc Basic nor Unit Converter Engineering Pro shows ads.
Which is updated more often, HydroCalc Basic or Unit Converter Engineering Pro?
HydroCalc Basic ships an update every 11 days, and Unit Converter Engineering Pro weekly. Most recently, HydroCalc Basic was updated on October 4, 2026 and Unit Converter Engineering Pro on September 15, 2026.

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