# 3D Interpolation vs Fluid Mechanics Calc

The clearest difference is price: Fluid Mechanics Calc at Free against 3D Interpolation's $9.99. 3D Interpolation's advantage is iOS requirement (12.0 vs 15.6). On update cadence, ads, in-app purchases and device support there is nothing between them.

Fluid Mechanics Calc is free to download; 3D Interpolation costs $9.99 up front. Neither carries in-app purchases, so what you see is what you pay.

3D Interpolation ships an update every 37 months, Fluid Mechanics Calc every 22 months. The most recent releases landed on November 1, 2026 and November 2, 2026 respectively.

## The numbers

| Metric | 3D Interpolation | Fluid Mechanics Calc |
| --- | --- | --- |
| Price | $9.99 | **Free** |
| Rating | — | **[5.0 (3 ratings)](https://appshunter.io/ios/app/fluid-mechanics-calc/id1404879538/reviews)** |
| Number of ratings | — | **3** |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 37 months | **Every 22 months** |
| Monetization | Paid | **Free** |
| Size | 7 MB | 108 MB |
| Requires iOS | **12.0** | 15.6 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Carlos Moura](https://appshunter.io/developer/407501202) | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) |

## What reviewers say

### 3D Interpolation

[App page](https://appshunter.io/ios/app/3d-interpolation/id1000298349)

Calculate key directional drilling parameters like TVD, coordinates, and displacement. This tool aids drilling engineers and students in oil well directional drilling by interpolating survey data.

**Highlights:** Calculate TVD, N/S, E/W coordinates, Determine Horizontal Displacement, Calculate Dog-Leg Severity, Measure Build-Up Rate, Calculate Turn Rate, Interpolate parameters between survey stations

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### 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


## Frequently asked questions

### Is 3D Interpolation free?

3D Interpolation costs $9.99, with no in-app purchases.

### Is Fluid Mechanics Calc free?

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

### Do 3D Interpolation or Fluid Mechanics Calc have ads?

Neither 3D Interpolation nor Fluid Mechanics Calc shows ads.

### Which is updated more often, 3D Interpolation or Fluid Mechanics Calc?

3D Interpolation ships an update every 37 months, and Fluid Mechanics Calc every 22 months. Most recently, 3D Interpolation was updated on November 1, 2026 and Fluid Mechanics Calc on November 2, 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.*