Emergency Room wait times
My daughter was born with Prader-Willi syndrome so we spend more time in hospitals than the average family. Some ERs we've been to have been terrible experiences, much of which was caused by long wait times.
I learned it's best to look at all your options upfront, but that can be a huge hassle in general and is especially unenjoyable during a health scare.
So I build a dashboard to sort ERs by their current published wait times.