# iTurbo vs LSPIV

The clearest difference is update cadence: LSPIV at every 13 months against iTurbo's every 54 months. LSPIV also leads on iOS requirement (11.0 vs 18.0). On price, rating, ratings volume and ads there is nothing between them.

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

On the App Store both sit at effectively the same score — 5.0 for iTurbo against 5.0 for LSPIV. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

iTurbo ships an update every 54 months, LSPIV every 13 months. Both last shipped on June 24, 2026.

## The numbers

| Metric | iTurbo | LSPIV |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/iturbo/id314368331/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/lspiv/id981387743/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 54 months | **Every 13 months** |
| Monetization | Free | Free |
| Size | 2 MB | 71 MB |
| Requires iOS | 18.0 | **11.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Torbjorn Sjogren](https://appshunter.io/developer/313743954) | [Ryota Tsubaki](https://appshunter.io/developer/981387742) |

## 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


### LSPIV

[App page](https://appshunter.io/ios/app/lspiv/id981387743)

This application enables large-scale particle image velocimetry (LSPIV) using a smartphone. It offers a non-intrusive method for measuring water surface velocity distribution in both field and lab settings. The app provides instant ortho-rectification of captured images without needing ground control points.

**Highlights:** Large-scale particle image velocimetry, Water surface velocity measurement, Non-intrusive velocimetry, Smartphone implementation, Instant ortho-rectification, No GCPs required

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is iTurbo free?

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

### Is LSPIV free?

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

### Which has better reviews, iTurbo or LSPIV?

iTurbo and LSPIV are both rated 5.0 out of 5 on the App Store, from 1 and 1 ratings respectively.

### Do iTurbo or LSPIV have ads?

Neither iTurbo nor LSPIV shows ads.

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

iTurbo ships an update every 54 months, and LSPIV every 13 months. Most recently, iTurbo was updated on June 24, 2026 and LSPIV on June 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.*