Comparison

HydroCalc Basic vs Aeshna

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

Head to head
About

HydroCalc Basic

Features
Read full description

Pipe Headloss Calculator provides engineers, designers, and students with powerful tools for pipeline hydraulic analysis β€” 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 β€” from the classroom to the field.

About

Aeshna

Features
Read full description

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

HydroCalc Basic4 screens
Aeshna4 screens

Verdict

The call

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

CostPrice Β· In-app purchases Β· Ads Β· Monetization

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.

UpkeepUpdate frequency

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.

Scorecard2 real differences Β· 4 level
HydroCalc Basic versus Aeshna: the parameters behind the verdict, then further details
ParameterHydroCalc BasicAeshna
PriceFreeFree
Update frequencyEvery 11 days β€” betterEvery 6 weeks
AdsNoNo
In-app purchasesYesYes
DevicesiPhone, iPad, iPodiPhone, iPad, Mac
Requires iOS15.1 β€” better18.6
Further details β€” not scored
Size35 MB57 MB
Age rating4+4+
DeveloperTransparent Blue Water LLCShenzhen Seize Times E-Commerce Co., Ltd.

In-app purchases

1 purchases

HydroCalc Basic

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

Aeshna

Subscriptions6
  • Viewra Models (Monthly)$4.991 Month
  • Viewra BIMs (Monthly)$4.991 Month
  • Viewra Complete (Monthly)$6.991 Month
Show 3 more
  • Viewra Models (Yearly)$34.991 Year
  • Viewra BIMs (Monthly)$34.991 Year
  • Viewra Complete (Yearly)$49.991 Year
One-time4
  • Viewra Drawings (Lifetime)$39.99
  • Viewra Models (Lifetime)$69.99
  • Viewra BIMs (Lifetime)$69.99
Show 1 more
  • Viewra Complete (Lifetime)$99.99

Questions

Is HydroCalc Basic free?
HydroCalc Basic is free to download, with in-app purchases available.
Is Aeshna free?
Aeshna is free to download, with in-app purchases available.
Do HydroCalc Basic or Aeshna have ads?
Neither HydroCalc Basic nor Aeshna shows ads.
Which is updated more often, HydroCalc Basic or Aeshna?
HydroCalc Basic ships an update every 11 days, and Aeshna every 6 weeks. Most recently, HydroCalc Basic was updated on September 8, 2026 and Aeshna on September 20, 2026.

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