This app has many neat features that the regular calculator app doesnt have, which had many clunks, no backspace, and touch-sensitivity was stiff. Calculator has everything that I need and what you need. History, backspace, calculation logs, spell out and customization. There are a few things that I wish Calzy had, like Roman Numerals within Spell Out, the option to add more than two buttons in the Spell Out feature instead of going to settings to switch languages. Hope to see these kinds of features in the future. Once again, this is the perfect app!
SilverChronos about Calzy