# Pixel Wind Tunnel vs FlatSixDynamics

The clearest difference is in-app purchases: Pixel Wind Tunnel at none against FlatSixDynamics's 1. Pixel Wind Tunnel also leads on iOS requirement (15.0 vs 18.0). FlatSixDynamics's advantage is ads (none vs shown) and update cadence (every 6 days vs every 7 months). On price and device support there is nothing between them.

Both are free to download. FlatSixDynamics sells 1 one-off in-app purchase. Pixel Wind Tunnel asks for nothing beyond the download.

Pixel Wind Tunnel ships an update every 7 months, FlatSixDynamics every 6 days. The most recent releases landed on October 25, 2026 and October 24, 2026 respectively.

## The numbers

| Metric | Pixel Wind Tunnel | FlatSixDynamics |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 0.0% of reviews | — |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | Every 7 months | **Every 6 days** |
| Monetization | Ad-supported | — |
| Size | 21 MB | 40 MB |
| Requires iOS | **15.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Hiroki Kijima](https://appshunter.io/developer/1326808571) | [Juergen Groenner](https://appshunter.io/developer/6771928531) |

## What reviewers say

### Pixel Wind Tunnel

[App page](https://appshunter.io/ios/app/pixel-wind-tunnel/id6760957754)

Visualize real fluid dynamics on your device by drawing shapes and simulating their interaction with air or liquid. Explore flow patterns, measure aerodynamic coefficients, and understand physics with real calculations, not approximations.

**Highlights:** Draw custom shapes for simulation, Real-time 2D fluid dynamics calculations, Multiple visualization modes (velocity, pressure, vorticity, streamlines), Calculate aerodynamic coefficients (drag, lift), Place probes to track fluid properties, Adjust simulation parameters (inlet velocity, viscosity), Compare different shape designs

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

**In-app purchases:** none


### FlatSixDynamics

[App page](https://appshunter.io/ios/app/flatsixdynamics/id6771928529)

**Features:** Vision Pro support

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Full access | $2.99 | one-time |


## Frequently asked questions

### Is Pixel Wind Tunnel free?

Pixel Wind Tunnel is free to download, with no in-app purchases.

### Is FlatSixDynamics free?

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

### Do Pixel Wind Tunnel or FlatSixDynamics have ads?

Pixel Wind Tunnel shows ads; FlatSixDynamics does not.

### Which is updated more often, Pixel Wind Tunnel or FlatSixDynamics?

Pixel Wind Tunnel ships an update every 7 months, and FlatSixDynamics every 6 days. Most recently, Pixel Wind Tunnel was updated on October 25, 2026 and FlatSixDynamics on October 24, 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.*