# Turing Machine Notepad vs P.I.

The clearest difference is update cadence: P.I. at every 3 weeks against Turing Machine Notepad's every 9 months. P.I. also leads on iOS requirement (15.0 vs 17.0). 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.

Turing Machine Notepad ships an update every 9 months, P.I. every 3 weeks. The most recent releases landed on October 5, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Turing Machine Notepad | P.I. |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (3 ratings)](https://appshunter.io/ios/app/turing-machine-notepad/id6755933821/reviews)** | — |
| Number of ratings | **3** | — |
| Positive reviews | 100.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 9 months | **Every 3 weeks** |
| Monetization | Free | — |
| Size | 2 MB | 163 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 12+ |
| Developer | [Nicolas Lehovetzki](https://appshunter.io/developer/412827944) | [BoardM](https://appshunter.io/developer/6792665780) |

## What reviewers say

### Turing Machine Notepad

[App page](https://appshunter.io/ios/app/turing-machine-notepad/id6755933821)

This digital notepad helps players of the Turing Machine board game track game state, manage deductions, and record test results. It offers an intuitive interface for managing multiple rounds and strategies, digitizing the gaming experience.

**Highlights:** Possibility elimination grid, Verification tracking table, Rich text editor with SF symbols, Auto-save functionality, Manage multiple rounds, Dynamic test row addition

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


### P.I.

[App page](https://appshunter.io/ios/app/pi/id6792665778)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Turing Machine Notepad free?

Turing Machine Notepad is free to download, with no in-app purchases.

### Is P.I. free?

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

### Do Turing Machine Notepad or P.I. have ads?

Neither Turing Machine Notepad nor P.I. shows ads.

### Which is updated more often, Turing Machine Notepad or P.I.?

Turing Machine Notepad ships an update every 9 months, and P.I. every 3 weeks. Most recently, Turing Machine Notepad was updated on October 5, 2026 and P.I. on October 8, 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.*