listenonrepeat.com was up for years until last month, when it mysteriously went offline. I haven’t found any sites like it. I could just paste in a youtube link and have it play right away, and choose the start and end times for looping, and it had a count for how many times you played the song, as well viewing history (with start & end times saved) so you could easily listen to previous songs.
Another option is to download then open with VLC and use the loop function to select what needs to repeat.
Yeah, mpv or whatever media player. Most players can do an a-b loop. But if that’s all, then you’re missing on the historical stats stuff OP mentioned.