I found a website that accurately shows the BPM for many songs that can be found mapped in osu! I tried it with Last Surprise -Scramble-, Happppy song, Yomi Yori, Remote Control, and Like Flames. All were perfectly correct. If this was already linked somewhere on a form please let me know!
https://songbpm.com/
Hope you found this helpful!
https://songbpm.com/
Hope you found this helpful!