It’s all about having the .lrc file, it gets read automatically (as long as it’s named like the song file) by mpv player and many android players.

It’s a simple text file containing the lyrics with timestamps. You can get them from deezer for example with certain downloaders. Or look for them on Soulseek.

Spotube.

Note that it’s not really a Spotify streaming app, rather it uses your (free) Spotify account for playlists, search, recommendations, etc. and then goes and find the song you want to play on YouTube, and the lyrics from scraping websites I think. Pretty clever.

The lyrics source that Spotify uses is free with a few caveats, like ads. The normal synced lyrics are free though.

The source is musixmatch and they have a floating lyrics window on Android which is neat.

Googles YouTube music just got updated for live lyrics.

Tidal. I use it because Id gotten tired of Spotify and YouTube Music’s BS

ViMusic

I just use Shazam for that