Countling, the calculator with a cast of characters

Field notes

The product keeps the underlying arithmetic constant while varying the interface character and sound: Momo, for example, is a bunny who counts in C and rejects division by zero. The homepage names thirteen characters in total, offers four in the free tier, and describes themed bundles including a Spooky Pack and a Christmas Pack. It also states that downloaded use does not require an internet connection, although the App Store release is still marked as coming soon.