The author was working on decimal to hex and binary conversions on their Mac using Apple’s Calculator when they noticed some wobbly lines of numbers that distracted them. Upon investigation, they discovered that some digits in the binary display section were off by one pixel. Despite the nice anti-aliased rendering, the misplaced digits raised questions about the calculator’s UI coordinate system and potential rounding errors. The author speculated that the app’s long period of being open may have contributed to the issue. Unable to provide feedback to Apple, they decided to share the bug online for others to see.
https://martin.wojtczyk.de/2024/08/31/is-my-vision-that-bad-no-its-just-a-bug-in-apples-calculator/