# Fluid Mechanics Calc vs Pathly

The clearest difference is in-app purchases: Fluid Mechanics Calc at none against Pathly's 1. Fluid Mechanics Calc also leads on device support (3 vs 1). Pathly's advantage is update cadence (every 2 days vs every 22 months). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Pathly sells 1 one-off in-app purchase. Fluid Mechanics Calc asks for nothing beyond the download.

Fluid Mechanics Calc ships an update every 22 months, Pathly every 2 days. The most recent releases landed on October 12, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Fluid Mechanics Calc | Pathly |
| --- | --- | --- |
| 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** | Yes |
| Ads | No | No |
| Update frequency | Every 22 months | **Every 2 days** |
| Monetization | Free | — |
| Size | 108 MB | 1 MB |
| Requires iOS | **15.6** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Trelleborg Sealing Solutions](https://appshunter.io/developer/396863758) | [Jhomar Maravillas](https://appshunter.io/developer/6783703541) |

## 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


### Pathly

[App page](https://appshunter.io/ios/app/pathly-g-code-viewer/id6792144397)

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

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Unlock Unlimited | $4.99 | one-time |


## Frequently asked questions

### Is Fluid Mechanics Calc free?

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

### Is Pathly free?

Pathly is free to download, with in-app purchases available.

### Do Fluid Mechanics Calc or Pathly have ads?

Neither Fluid Mechanics Calc nor Pathly shows ads.

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

Fluid Mechanics Calc ships an update every 22 months, and Pathly every 2 days. Most recently, Fluid Mechanics Calc was updated on October 12, 2026 and Pathly on October 25, 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.*