# Fluid Mechanics Calc vs API MeasurePro

The clearest difference is update cadence: API MeasurePro at every 3 months against Fluid Mechanics Calc's every 22 months. API MeasurePro also leads on iOS requirement (13.0 vs 15.6). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Fluid Mechanics Calc ships an update every 22 months, API MeasurePro every 3 months. The most recent releases landed on October 12, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | Fluid Mechanics Calc | API MeasurePro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calc/id1404879538/reviews)** | — |
| Number of ratings | **3** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 3 months** |
| Monetization | Free | — |
| Size | 108 MB | 20 MB |
| Requires iOS | 15.6 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Automated Precision Inc.](https://appshunter.io/developer/1846172575) |

## What reviewers say

### Fluid Mechanics Calc

[App page](https://appshunter.io/ios/app/fluid-mechanics-calc/id1404879538)

This utility app provides a comprehensive calculator for fluid mechanics, civil, and structural engineering parameters. It offers over 130 formulas and 360 calculation methods, supporting seamless unit system switching for analysis, design, and operation of fluid-related systems.

**Highlights:** 130+ fluid mechanics formulas, 360+ calculation methods, Unit system conversion (metric/US), Favorite formula marking, High mathematical precision, Seamless unit switching

**Features:** macOS Compatibility

**In-app purchases:** none


### API MeasurePro

[App page](https://appshunter.io/ios/app/api-measurepro/id6754576227)

**In-app purchases:** none


## Frequently asked questions

### Is Fluid Mechanics Calc free?

Fluid Mechanics Calc is free to download, with no in-app purchases.

### Is API MeasurePro free?

API MeasurePro is free to download, with no in-app purchases.

### Do Fluid Mechanics Calc or API MeasurePro have ads?

Neither Fluid Mechanics Calc nor API MeasurePro shows ads.

### Which is updated more often, Fluid Mechanics Calc or API MeasurePro?

Fluid Mechanics Calc ships an update every 22 months, and API MeasurePro every 3 months. Most recently, Fluid Mechanics Calc was updated on October 12, 2026 and API MeasurePro on October 16, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*