I've been having a bad tinnitus flareup this week, which has had a big impact on my productivity and ability to focus. This feature to play a selection of white noise patterns has really helped (System Settings > Accessibility > Hearing > Audio > Background Sound). It's one of those features that I don't see mentioned ever, but it's been a godsend since I discovered it.

Dark Noise is my jam!

Screenshot of the macOS hearing accessibility menu, with options for different white noise background sounds that can be selected. Dark Noise is selected, and a volume slider is at the bottom of the window.
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