HydroCalc Plus vs Entrigy
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
HydroCalc Plus
A professional tool for hydraulic engineers to calculate pressure losses in piping systems. It supports US and SI units, offers an extensive pipe material and fittings database, and includes inverse calculations for design optimization.
- Friction head loss calculation (Hazen-Williams)
- US and SI unit support
- Extensive pipe material library
- Fittings and valves database
- Inverse calculation mode
- Real-time results (velocity, losses)
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Professional hydraulic engineering tool for calculating pressure losses in piping systems. Essential for engineers, plumbers, and contractors designing water distribution networks. Key Features: Calculate friction head losses using industry-standard Hazen-Williams equation Support for both US (ft, gpm, psi) and SI (m, lps, bar) units Extensive pipe material library with pre-defined roughness coefficients (C-factors) Complete fittings and valves database including elbows, tees, valves, contractions, and expansions Inverse calculations to determine optimal pipe diameter, flow rate, or length for target head loss Real-time results showing velocity, friction loss, minor losses, and total system head loss What Sets Pro Apart: Unlike basic calculators, HydroCalc Pro accounts for both major losses (pipe friction) and minor losses (fittings and valves). The app includes a comprehensive database of K-factors for various components, allowing accurate total system pressure loss calculations. Perfect For: Water supply system design Irrigation network planning HVAC piping calculations Fire protection systems Industrial fluid transport Educational purposes in hydraulic engineering Technical Capabilities: The app considers all critical factors affecting pressure loss: flow velocity, pipe diameter, internal roughness, pipe length, and fitting configurations. Materials include PVC, polyethylene, steel, cast iron, concrete, and more with accurate C-factors ranging from 120-150. Inverse Calculation Mode: Unique feature allowing backward calculations - determine required pipe size for allowable head loss, maximum flow capacity, or optimal pipe length for your system constraints. Simple, intuitive interface with instant results. No internet connection required. Professional-grade calculations in your pocket. Note: Premium modules are available in English and Spanish.
Entrigy
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Entrigy is a mobile application for managing nominations and work permits in the wind energy industry. The application enables: - Nomination management – creating, reviewing, and approving employee nominations along with verifying required documents and qualifications - Work permit management – creating and monitoring work permits for wind turbines - Multi-level access – various dashboards for users, ECC, and Vestas administrators - Document management – sending and reviewing certificates, ELOTO procedures, and safety documents - Notification system – local notifications of important events The application supports safety and compliance processes in wind turbine maintenance through system integration.
Screenshots
Verdict
The clearest difference is price: Entrigy at Free against HydroCalc Plus's $3.99. Entrigy also leads on in-app purchases (none vs 4) and update cadence (weekly vs every 3 weeks). On ads, device support and iOS requirement 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
Entrigy is free to download; HydroCalc Plus costs $3.99 up front. HydroCalc Plus sells 4 one-off in-app purchases. Entrigy asks for nothing beyond the download.
HydroCalc Plus ships an update every 3 weeks, Entrigy weekly. The most recent releases landed on October 4, 2026 and October 18, 2026 respectively.
| Parameter | HydroCalc Plus | Entrigy |
|---|---|---|
| Price | $3.99 | Free — better |
| Rating | 5.0 (1 ratings) — better | — |
| Positive reviews | 100.0% of reviews | — |
| Number of ratings | 1 — better | — |
| Update frequency | Every 3 weeks | Weekly — better |
| Ads | No | No |
| In-app purchases | Yes | No — better |
| Monetization | Paid | — |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Requires iOS | 15.1 — better | 15.5 |
| Further details — not scored | ||
| Size | 34 MB | 59 MB |
| Age rating | 4+ | 4+ |
| Developer | Transparent Blue Water LLC | Grzegorz Rakoca |
In-app purchases
HydroCalc Plus
- Pump Power Calculator$1.99
- System Curve Generator$1.99
- Pipe Database$1.99
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- Industrial Fluids Pack$2.99
Entrigy
No in-app purchases









