# Turing Machine Simulator

> A digital simulator for Turing Machines used in computer science and mathematics education. (iPhone/iPad app by Alexander Clauss.)

- Source: https://appshunter.io/ios/app/turing-machine-simulator/id303032123 (this page in markdown: same URL + `.md`)
- Developer: [Alexander Clauss](https://appshunter.io/developer/286091996)
- Category: Education, Productivity
- Price: $2.99
- Rating: 4.80/5 from 4 App Store ratings · 14 written reviews indexed
- Age rating: 4+
- Requires: iOS 12.0 · 2 MB
- Languages: American English, German (Germany)
- Released: 2009-01-28
- Data updated: 2026-08-14
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/turing-machine-simulator/id303032123/reviews.md

## What is Turing Machine Simulator?

This app is a Turing Machine Simulator. 

Students of computer science and maths are probably familar with Turing Machines, because the Turing Machine is one of the important models when analyzing if mathematical problems or algorithms are computable. 

Usually dealing with Turing machines requires paper and pencil for simulating the program execution. This app can help  by providing several ways to execute Turing programs and analyze it in an easy and comfortable way.

You can write new programs for the Turing Machine, execute them and analyze the execution even step by step. It's also possible to change the speed of the execution.

It's possible to export and import Turing programs using email.

The app comes with some example Turing programs to play with.

## Key features

- Turing Machine simulation
- Program execution and analysis
- Step-by-step execution
- Adjustable execution speed
- Export/import programs via email
- Includes example programs

## Recent user reviews (10 of 14)

All indexed reviews: https://appshunter.io/ios/app/turing-machine-simulator/id303032123/reviews.md

### 5/5 — Nice

*2019-12-02*

Nice UI!

### 4/5 — Good program

*2019-07-30*

I can’t put a name for a program I create, and I can’t modify its alphabet.  I’m supposed to be able to but the changes are not saved.  This surprised me because it’s a sleek app otherwise.  I’m hoping this will be fixed quickly and I will revise my rating if so.  Not good for a paid app to have showstopper bugs like this.

EDIT: I figured out that I wasn’t tapping DONE.  If you edit the name or the alphabet, and tap away to a different section, the changes will be SHOWN on screen still but will not be saved.  I still think this is a bug, but there’s a workaround (just tap DONE after each edit) so it’s not a showstopper.  Upgrading my rating therefore.

### 5/5 — Really nice Turing simulation

*2016-06-23*

I've tried a few other Turing sims and this one is the best so far. It's pretty flexible and relatively intuitive to operate with decent documentation and links to more information. The examples are pretty neat and are even commented. Overall, a nice app for the price.

### 5/5 — Excellent

*2015-05-06*

An exceptionally good app, with all the features it should have—and with a clean, intuitive, and well-designed interface that makes it a pleasure to use.

### 4/5 — Good, but it has a few glitches.

*2012-01-26*

Every time I try to delete an instruction, it exits to the main menu. Other than that, it worked just fine.

### 4/5 — Tut was es soll

*2011-10-10*

Der Preis ist etwas hoch aber es funktioniert gut.

### 5/5 — Gute lernsoftware

*2011-01-30*

Kann ich jedem informatikstudenten empfehlen!

### 5/5 — Very good app

*2010-05-15, version 0*

Very good! 4 stars because there is a little crash when deleting an instruction. Needs TM multi tape version and graphical editor. Maybe next update?

### 5/5 — Faithful representation

*2010-04-02*

Excellent simulator;  I like the use of "theory" syntax for the rules, and the debugging features gave me a laugh.  

Features I'd like to see
 - the ability for a rule to not move the tape head, but not halt the program either.   
 - a way to input a state and have auto-generated stub rules for every alphabet symbol (would speed up program entry considerably).

### 4/5 — Very great!

*2010-01-23, version 0*

Great application, well done indeed!
I hope for a general update (soon) and more precise needs of the function, write its own commands, for example: 0,A,0,B,>
Anyway, an update to improve overall!
Money well spent.

## Frequently asked questions about Turing Machine Simulator

### What is the Turing Machine Simulator?

The Turing Machine Simulator is a digital tool designed to help students and professionals understand and experiment with Turing Machines, a key model in theoretical computer science and mathematics for analyzing computability.

### How does the Turing Machine Simulator help with learning?

It provides an interactive environment to write, execute, and analyze Turing Machine programs step-by-step, offering a more comfortable and efficient alternative to manual paper-and-pencil simulations.

### Can I save and share my Turing Machine programs?

Yes, the app allows you to export your Turing programs via email, making it easy to save your work or share it with others for collaboration or review.

### Does the Turing Machine Simulator offer pre-made examples?

Yes, the application comes with several example Turing programs that users can explore and learn from, providing a starting point for understanding its capabilities.

### What devices is the Turing Machine Simulator compatible with?

The Turing Machine Simulator is available for iPhone, iPad, and iPod devices, offering a portable solution for studying theoretical computer science concepts.

### How often is the Turing Machine Simulator updated?

The app was last updated on September 15, 2025, indicating ongoing support and potential for future improvements and bug fixes.

### What is the user sentiment for the Turing Machine Simulator?

Based on the available data, the app has a very high rating of 4.8 stars from 4 ratings, suggesting strong positive user sentiment among its users.

### What is the price of the Turing Machine Simulator?

The Turing Machine Simulator is a paid application, available for $2.99, offering a one-time purchase for access to its features.

## Version history (last 5 releases)

### 2.4 — 2025-09-15

- Support for iOS 26 (Liquid Glass) added
- Support for dynamic fonts (accessibility features) added
- Bugfix: fixes an issue where the tape inscription of an tape that is infinite on both sides was only preserved for one side, after a turing program has finished running (this is usually not critical, because for a new run you would normally create a new tape inscription instead of reusing the old one)

### 2.3 — 2024-02-09

Fixes some visual issues in dark mode

### 2.2 — 2024-01-24

- Makes it easier to enter states while defining new instructions: Already existing states can be now simply picked from a popup menu by pressing the "+" button. So you don't have to enter these via keyboard again. 
- Fixes an issue with wrong "endless loop" messages under certain conditions.
- Fixes an issue with changes in text field being not retained when directly leaving the view without confirming with the "return" key

### 2.1 — 2018-11-15

Support for new devices added (iPhone X, XS, XS Max, XR, iPad Pro)

### 2.0 — 2015-01-27

- The App is now universal and runs on iPad, iPhone and iPod Touch
- Updated for iOS 8
- Supports the new larger iPhone 6/6 plus devices

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## More apps by Alexander Clauss

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- [Numeral (Numeral Systems)](https://appshunter.io/ios/app/numeral-numeral-systems/id301316012)
- [Zeichen](https://appshunter.io/ios/app/zeichen/id305063893)

All apps by Alexander Clauss: https://appshunter.io/developer/286091996

## Related topics

[turing machine simulator](https://appshunter.io/ios/topics/turing-machine-simulator)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-08-14.*