Nornlore
Type in a birthday and get the history that shares it, laid out as a Daily Prophet-style newspaper.
Nornlore answers one question — what else happened on your birthday — and answers it properly. Every one of the 366 dates has its own page pulling together the events, people, music and films tied to that day, roughly 2,594 entries in total, presented as a wizarding-newspaper front page rather than a list of bullet points.
It is the kind of thing you open to check your own date and close forty minutes later having worked through everyone you know. Free, no sign-up, and no upsell at the end.