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Re:Tom Hanks’ Typewriter App Is No. 1 in the App Store by robert_tweed on Monday August 18, 2014 @11:53PM (#8195973)
It was built by agency Hitcents, who gave the production process a fairly detailed write-up here:

http://www.hitcents.com/b2b/work/hanx

Re:Tom Hanks’ Typewriter App Is No. 1 in the App Store by ja27 on Tuesday August 19, 2014 @01:34PM (#8198654)
It's moderately interesting because it was built using Xamarin. So the top iPad app (at least for a little while) was built using C#.

http://blog.xamarin.com/tom-hanks-vintage-typewriter-inspire...