I have found this one on the other HN thread yesterday: https://www.cyclinganalytics.com/
No fluff just stuff. Unfortunately screenshots are low-res, but you can check Try link to at least see reporting with author's real rides. Blog also has some screenshots.
Check out Pieter Levels' projects, most notably NomadList and RemoteOK.
NomadList especially only started out as a shared spreadsheet. There's a good writeup here:
https://levels.io/product-hunt-hacker-news-number-one/
I have found this one on the other HN thread yesterday: https://www.cyclinganalytics.com/ No fluff just stuff. Unfortunately screenshots are low-res, but you can check Try link to at least see reporting with author's real rides. Blog also has some screenshots.
https://news.ycombinator.com/
I don't know about "successful" but my solo weekend project is pretty plain only because I'm not much of a designer: https://www.nominal.net
Define successful website?
I have thousands of users, a few websites pay for themselves:
https://easy-a.net/
https://projectpiglet.com/