Subline

Send YouTube playback, artwork and captions to the Subline macOS overlay.

Subline sends what is playing in your YouTube or YouTube Music tab to the free Subline app for macOS, which shows it in a small floating window above your other apps. • Album art or the video thumbnail, with colors that follow the artwork • Time-synced lyrics (YouTube Music) and captions (YouTube), with the next line previewed • Glass, Tinted and Clear styles; cover, cover + line, lyrics and mini layouts • Drag anywhere, resize from any edge, snap to screen edges, click-through mode • Play/pause, next and previous from the overlay or global shortcuts • Lightweight: the extension only relays events; the overlay uses about 1% CPU while playing Requires the Subline app for macOS (macOS 14 or later; universal app for Apple Silicon and Intel). Without it the extension does nothing and sends nothing. It does not run in incognito windows. Privacy: no accounts, analytics or tracking. Playback information goes only to the Subline app on your Mac. On YouTube Music the extension asks the open page for the song's lyrics (the same request the page's Lyrics tab makes); it never reads cookies. The app looks up synced lyrics on lrclib.net, a public lyrics database (song title, artist, album and length). See the privacy policy for details.