I usually see the well known rainbow colored spinning wheel when the Mac is working on something, but sometimes there is a blue one. What is the difference between them? Do they come from the OS and have a special meaning or is it application dependent?
MacOS – What’s the difference between rainbow and regular spinning wheel
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Best Answer
Source: OS X Human Interface Guidelines: Use the Right Pointer for the Job
The blue pinwheel is sometimes called the JavaScript pinwheel as JavaScript in websites are one of the primary ways a user will see this cursor, for cross-platform reasons, as in OS X a 'waiting' cursor is generally not recommended.