CrypTool

Name: CrypTool
Rating: 3 (3 reviews)
Author: Arthur Guiot

3 ratings

Archived App (Last seen on 16 Mar 2026)

This is an archived listing of the app previously available on the App Store.

Although the app is no longer distributed by Apple, you can still view its description, screenshots, version history, ratings, and metadata for reference.

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Developer

Arthur Guiot

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⭐4

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❓8 answered

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About

Learn the art of hiding messages through cryptography with interactive challenges. Explore various ciphers implemented in multiple programming languages to understand message concealment, not secure communication.

✓Learn cryptography concepts

✓Implement ciphers in programming languages

✓Complete interactive challenges

✓Experiment with message concealment

✓Explore various implemented ciphers

Show original description

What's New in CrypTool

2.0.1

June 18, 2020

Some users reported that the UI was unusable on new iPhones. We're sorry for this bug. What happened is that we released the wrong build... It's now fixed and shouldn't happen ever again. Thank you for your comprehension.

User reviews

Most Recent Highest Rated Lowest Rated

Interesting and fun to use

Great choices of encryptions to learn but I honestly would enjoy this more if there was an option to use and learn the bifid cipher

AsapGee

2 years ago

Doesn’t work For iPhone 12

Can’t copy the encrypted text for some reason on iPhone. The text gets encrypted but its impossible to copy the encrypted text. Probably a simple fix but super annoying and is making the app useless

maxxiieeeee

4 years ago

Cipher portion unusable on smaller iOS device like iPod touch 7th gen

This review is based on observations made while running the app on an iPod touch 7th gen running iOS 13.5.1. The problem described likely occurs on all iOS devices with an equivalent display size.

While using the encryption portion of the app (ciphers), all the controls overlap each other making it entirely impossible to use.

After some exchanges, the dev is simply ignoring the problem ...

I wish I could downgrade.
The previous version was working just fine ...

sky668

6 years ago

Not sure what's going on

I really like what's provided on this app, the only problem is when I type in the correct answer it doesn't do anything. I’ve checked my answers with the provided cipher section and they are right, but it doesn't do anything when I type it into the answer bar. Weirdly enough it did tell me I was right for the emoji one, just none of the others. If this gets fixed I will change my review to five stars because it is a great app.

Unlink king

6 years ago

Response from developer

Sorry for the late answer, but it's now fixed. Thank you for letting us know.

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FAQ

What is CrypTool used for?

CrypTool is an educational application designed to help users understand and experiment with ciphers and the art of hiding message content. It focuses on the principles of cryptography rather than secure communication.

Is CrypTool free to use?

Yes, CrypTool is available for free. There are no in-app purchases or advertisements within the application.

What devices does CrypTool support?

CrypTool is available on Mac, iPhone, iPad, and iPod devices, allowing users to learn cryptography across multiple Apple platforms.

What is the age rating for CrypTool?

CrypTool has an age rating of 4+, making it suitable for a wide range of users interested in learning about ciphers.

How often is CrypTool updated?

The latest version of CrypTool is 2.0.1, and it was last updated on June 18, 2020. Future updates will continue to implement new ciphers.

Does CrypTool teach secure communication?

No, CrypTool explicitly states that it does not teach security or provide a way to communicate securely. Its focus is on the basics of ciphers and message concealment.

What kind of learning experience does CrypTool offer?

CrypTool offers a fun learning experience through interactive challenges that encourage users to think and apply cryptographic principles. It implements most ciphers directly within the app.

What is the user sentiment for CrypTool based on ratings?

CrypTool has a rating of 3.0 stars based on 3 ratings. This indicates a mixed user reception, suggesting some users find it valuable while others may have encountered limitations.