HydroCalc Basic vs Aeshna
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
HydroCalc Basic
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Pipe Headloss Calculator provides engineers, designers, and students with powerful tools for pipeline hydraulic analysis β without the hassle of complex manual computations. Whether youβre sizing new pipelines or analyzing existing systems, the app delivers rapid, accurate results. Key Features Automatic Unit Conversion β Seamlessly switch between US Customary and SI units for length, flow, and diameter. Pipeline-Specific Inputs β Enter pipeline length, flow rate, internal diameter, and pipe material. Powerful Inverse Calculator β 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 β from the classroom to the field.
Aeshna
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Aeshna is a professional CAD viewer and inspection tool for STEP and IGES files. Open, inspect, measure, and review 3D models directly on your device β no account required and no cloud upload. KEY FEATURES β’ STEP & IGES Support Open STEP, STP, IGES, and IGS files directly on your iPhone or iPad. β’ Assembly Tree Navigate assembly structures, inspect components, and control model visibility. β’ Section View Cut through models to inspect internal geometry and hidden details. β’ Exploded View Separate assembly components to better understand structure and relationships. β’ Precision B-Rep Measurement Measure distances, angles, areas, and volumes directly from B-Rep geometry. β’ PMI Support View dimensions, tolerances, datums, and other PMI information stored in STEP files. β’ Screenshot Markup Add drawings, shapes, and notes to model screenshots for review and sharing. β’ Multi-Format Export Export models to STEP, IGES, STL, OBJ, glTF, VRML, and other common formats. β’ Large Model Processing Use a paired Mac to process CAD models too large for your iPhone or iPad, then seamlessly continue viewing them on your device. Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Screenshots
Verdict
The clearest difference is update cadence: HydroCalc Basic at every 11 days against Aeshna's every 6 weeks. HydroCalc Basic also leads on iOS requirement (15.1 vs 18.6). On price, ads, in-app purchases and device support there is nothing between them.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Both are free to download. HydroCalc Basic sells 1 one-off in-app purchase and Aeshna sells 10 in-app purchases, starting at $4.99 per month. Whichever you choose, the download price is not the number that matters.
HydroCalc Basic ships an update every 11 days, Aeshna every 6 weeks. The most recent releases landed on September 8, 2026 and September 20, 2026 respectively.
| Parameter | HydroCalc Basic | Aeshna |
|---|---|---|
| Price | Free | Free |
| Update frequency | Every 11 days β better | Every 6 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Requires iOS | 15.1 β better | 18.6 |
| Further details β not scored | ||
| Size | 35 MB | 57 MB |
| Age rating | 4+ | 4+ |
| Developer | Transparent Blue Water LLC | Shenzhen Seize Times E-Commerce Co., Ltd. |
In-app purchases
HydroCalc Basic
- Premium - Flow Units & Ad-Free$1.99
Aeshna
- Viewra Models (Monthly)$4.991 Month
- Viewra BIMs (Monthly)$4.991 Month
- Viewra Complete (Monthly)$6.991 Month
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- Viewra Models (Yearly)$34.991 Year
- Viewra BIMs (Monthly)$34.991 Year
- Viewra Complete (Yearly)$49.991 Year
- Viewra Drawings (Lifetime)$39.99
- Viewra Models (Lifetime)$69.99
- Viewra BIMs (Lifetime)$69.99
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- Viewra Complete (Lifetime)$99.99
Questions
Is HydroCalc Basic free?
Is Aeshna free?
Do HydroCalc Basic or Aeshna have ads?
Which is updated more often, HydroCalc Basic or Aeshna?
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