Perfect! v2.0.1
I dont have the key click sound issue reported by other user (my device is iPhone 4, iOS 5.1). Settings work perfectly, turning sound on and off as it should be.
The version number is wrong as usernickname mentions, still showing v1.1 in about. The manual is working now, but it could be better if we had a search tool to locate subjects through a key word as we can do by reading in pdf files.
Despite those points I mentioned above, for me the app as is deserves the 5 stars.
I have an old real 11C calculator that has more than 30 years old, still working fine, and my only complaint was that it could not be with me all the time. Now, this problem was solved with this 15C version in my iPhone and I am very happy. Thank you so much!
@Brazil about
HP 15C Calculator