Video by MeterPlugs via YouTube
Source
MeterPlugs on Plugin Boutique
Mastering Engineer Ian Shepherd gives an in-depth tour of Loudness Penalty Studio, the standalone desktop app that allows you to visualize how your music will be loudness matched (i.e., normalized) on popular loudness streaming services including Apple Music, Spotify and YouTube.
Loudness Penalty Studio:
https://www.meterplugs.com/loudness-penalty-studio