# Pi Brain vs iTurbo

The clearest difference is rating: iTurbo at 5.0 against Pi Brain's 3.7. Pi Brain's advantage is update cadence (every 5 months vs every 54 months) and ratings volume (9 vs 1). On price, ads, in-app purchases and monetization model there is nothing between them.

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

iTurbo holds the better App Store score, 5.0 against 3.7. That said, the two scores are not equally well evidenced: Pi Brain has 9 ratings behind it against 1, so its average is the more settled of the two.

Pi Brain ships an update every 5 months, iTurbo every 54 months. The most recent releases landed on October 7, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Pi Brain | iTurbo |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [3.7 (9 ratings)](https://appshunter.io/ios/app/pi-brain/id311957474/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/iturbo/id314368331/reviews)** |
| Number of ratings | **9** | 1 |
| Positive reviews | 84.4% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 5 months** | Every 54 months |
| Monetization | Free | Free |
| Size | 3 MB | 2 MB |
| Requires iOS | **6.0** | 18.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Henry Chan](https://appshunter.io/developer/311957477) | [ManneTroll Solutions](https://appshunter.io/developer/313743954) |

## What reviewers say

### Pi Brain

[App page](https://appshunter.io/ios/app/pi-brain/id311957474)

Test and improve your ability to memorize digits of pi. Challenge yourself and friends to see who can recall the most numbers. This app serves as a fun learning tool for all ages to enhance memory retention.

**Highlights:** Memorize pi digits, Test memory recall, Score saving, Sort scores by date, name, or score, Friend contests, Learning tool

**Features:** macOS Compatibility

**In-app purchases:** none

**What reviewers like**

- 👍 Very user-friendly
- 🚀 Helps learn Pi digits quickly
- 🌟 Fun and engaging
- ✅ Works smoothly
- 💡 Great for memorization

**What reviewers complain about**

- 🐛 Buggy on newer iOS versions
- 🐛 Scrolling issues after 100 digits
- 🐛 Score history deleted on update
- 🐛 Keyboard blocks buttons
- 🐛 Can't save scores

**Reported bugs**

- Screen 'jumps' past ~100 digits
- Score history deleted on update
- Keyboard pops up and blocks buttons
- Cannot save scores
- App shuts down without saving score

**Requested features**

- Allow starting from any digit
- Option to not count '3' in row divisions
- Add a clear button on test page
- Practice mode for digits already mastered
- Levels based on digits learned


### 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


## Frequently asked questions

### Is Pi Brain free?

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

### Is iTurbo free?

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

### Which has better reviews, Pi Brain or iTurbo?

iTurbo is rated higher. Pi Brain averages 3.7 out of 5 from 9 ratings, while iTurbo averages 5.0 from 1 ratings.

### Do Pi Brain or iTurbo have ads?

Neither Pi Brain nor iTurbo shows ads.

### Which is updated more often, Pi Brain or iTurbo?

Pi Brain ships an update every 5 months, and iTurbo every 54 months. Most recently, Pi Brain was updated on October 7, 2026 and iTurbo on September 29, 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.*