# iTurbo vs Rondo

The clearest difference is in-app purchases: iTurbo at none against Rondo's 5. iTurbo also leads on iOS requirement (18.0 vs 26.0). Rondo's advantage is update cadence (every 3 days vs every 54 months). On price, rating, ratings volume and ads there is nothing between them.

Both are free to download. Rondo sells 5 one-off in-app purchases. iTurbo asks for nothing beyond the download.

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

iTurbo ships an update every 54 months, Rondo every 3 days. The most recent releases landed on October 31, 2026 and November 5, 2026 respectively.

## The numbers

| Metric | iTurbo | Rondo |
| --- | --- | --- |
| 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/rondo-prime-factorization/id6784029039/reviews) |
| Number of ratings | 1 | 1 |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 54 months | **Every 3 days** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 2 MB | 11 MB |
| Requires iOS | **18.0** | 26.0 |
| Devices | iPhone, iPod | **iPhone, iPad, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [ManneTroll Solutions](https://appshunter.io/developer/313743954) | [KEN TOMINAGA](https://appshunter.io/developer/975026926) |

## 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


### Rondo

[App page](https://appshunter.io/ios/app/rondo-prime-factorization/id6784029039)

Explore the mathematical beauty of numbers through interactive, animated factorization diagrams. Watch numbers dance, hear their unique songs, and even visualize them in augmented reality. Discover the stories behind special numbers and personalize your experience with customizable palettes and sounds.

**Highlights:** Animated factorization diagrams, Augmented reality number visualization, Auditory representation of factors, Interactive number exploration, Field Guide for special numbers, Home screen and Apple Watch widgets, Customizable color palettes and sounds

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Tip a prime · 199 | $1.99 | one-time |
| Tip a prime · 499 | $4.99 | one-time |
| Rondo Pro | $4.99 | one-time |
| Tip a prime · 599 | $5.99 | one-time |
| Tip a prime · 1999 | $19.99 | one-time |


## Frequently asked questions

### Is iTurbo free?

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

### Is Rondo free?

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

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

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

### Do iTurbo or Rondo have ads?

Neither iTurbo nor Rondo shows ads.

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

iTurbo ships an update every 54 months, and Rondo every 3 days. Most recently, iTurbo was updated on October 31, 2026 and Rondo on November 5, 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.*