The best available on the App store
If you are at all interested in WWII, then this Enigma machine will be of great interest. This is the most realistic of all of them available on the App Store. You are able to set it up and use it exactly like the real thing, even looks like the real thing including all rotors, plugboard, etc. However with the last update, you can now easily set up the starting configuration and translate messages in an easy mode if the complex setup is not your thing. Beautifully made, and well supported. Kudos to the developer!
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Mininigma: Enigma Simulator, v2.7.0