# LSPIV vs AeroEngineS

The clearest difference is update cadence: AeroEngineS at every 3 days against LSPIV's every 13 months. LSPIV's advantage is iOS requirement (11.0 vs 14.0). 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 LSPIV against 5.0 for AeroEngineS. Both are backed by a comparable volume of ratings — 1 and 1 respectively.

LSPIV ships an update every 13 months, AeroEngineS every 3 days. Both last shipped on June 24, 2026.

## The numbers

| Metric | LSPIV | AeroEngineS |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [5.0 (1 ratings)](https://appshunter.io/ios/app/lspiv/id981387743/reviews) | [5.0 (1 ratings)](https://appshunter.io/ios/app/aeroengines/id1451710013/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 13 months | **Every 3 days** |
| Monetization | Free | Free |
| Size | 71 MB | 7 MB |
| Requires iOS | **11.0** | 14.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Ryota Tsubaki](https://appshunter.io/developer/981387742) | [Aristotle University of Thessaloniki](https://appshunter.io/developer/542325073) |

## What reviewers say

### 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


### AeroEngineS

[App page](https://appshunter.io/ios/app/aeroengines/id1451710013)

This app simulates the thermodynamic cycles and performance of various aircraft and rocket engines. It calculates key parameters like thrust, mass flow, and emissions, and can predict compressor map operating points.

**Highlights:** Turbojet and turbofan engine simulation, Rocket engine cycle analysis, Ramjet engine simulation, Emissions calculation, Compressor map prediction, Thermodynamic cycle analysis

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is LSPIV free?

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

### Is AeroEngineS free?

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

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

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

### Do LSPIV or AeroEngineS have ads?

Neither LSPIV nor AeroEngineS shows ads.

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

LSPIV ships an update every 13 months, and AeroEngineS every 3 days. Most recently, LSPIV was updated on June 24, 2026 and AeroEngineS 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.*