# iTurbo vs x

The clearest difference is update cadence: x at fortnightly against iTurbo's every 54 months. 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.

iTurbo ships an update every 54 months, x fortnightly. The most recent releases landed on September 29, 2026 and September 28, 2026 respectively.

## The numbers

| Metric | iTurbo | x |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iturbo/id314368331/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 54 months | **Fortnightly** |
| Monetization | Free | — |
| Size | 2 MB | 1 MB |
| Requires iOS | 18.0 | 18.0 |
| Devices | **iPhone, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [ManneTroll Solutions](https://appshunter.io/developer/313743954) | [FMILLET](https://appshunter.io/developer/550887984) |

## What reviewers say

### iTurbo

[App page](https://appshunter.io/ios/app/iturbo/id314368331)

This app simulates fluid dynamics by solving Navier-Stokes equations for 2D incompressible turbulence. It uses a direct numerical simulation method with Euler time stepping and Fourier space calculations for efficiency.

**Highlights:** Direct Numerical Simulation (DNS), Navier-Stokes equation solver, 2D incompressible turbulence, Euler time stepping, Fourier space calculations, Vorticity field transformation

**Features:** macOS Compatibility

**In-app purchases:** none


### x

[App page](https://appshunter.io/ios/app/x-cal-plus/id6747112339)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iTurbo free?

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

### Is x free?

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

### Do iTurbo or x have ads?

Neither iTurbo nor x shows ads.

### Which is updated more often, iTurbo or x?

iTurbo ships an update every 54 months, and x fortnightly. Most recently, iTurbo was updated on September 29, 2026 and x on September 28, 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.*