Turing Machine Simulator

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.

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.

I would give it 5 stars except for a bug I found. Bring up the binary number incrementer and on the last step (1, ' ') change the movement from Halt to Left. Then change the tape to "111" and run it. It will correctly increment it to 1000, but when it does that last step, it does not move the head. Not sure why - I e-mailed the author. But the idea to do this is brilliant. Is this the only general programmable app allowed in the store??? I think maybe so!

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

Ok so probably this app won't appeal to the typical app store shopper, but for those who know what this is, this is awesome! Very good interface, stable and actually fun. Even non-computer scientists who enjoy puzzles would enjoy this. Great work!