Subline
Your lyrics, floating on top.
Sing along to YouTube, YouTube Music, Spotify and Apple Music without switching windows. Synced lines in a small panel that stays over your work.
Latest release · macOS 14+ · Apple silicon & Intel · signed & notarized · free
Watch it in 25 seconds
Every screen in the film is Subline's real overlay, drawn from made-up songs.
Everything you need to sing along
Right on time
Lines light up with the music, with the next one in view. Tap any line to jump there.
Two languages at once
Romanization for Korean, Japanese and Chinese, YouTube's translated captions, or Apple's on-device translation (macOS 26).
Pick your spot
Cover, Cover + Line, Lyrics or Mini, in Glass, Tinted or Clear. The current line can also sit in the menu bar or the notch.
Lyrics that find themselves
YouTube Music's own lyrics first, then LRCLIB, timed lyrics always preferred. Wrong version? Pick another, or import your own .lrc.
Light on your Mac
About 1% CPU while playing and next to nothing when idle. The music never plays twice.
Feels native
Liquid Glass on macOS 26, artwork-tinted colors, resize from any edge, click-through mode, VoiceOver and Korean UI.
Playback stays in your browser
Subline doesn't play or record anything. It only receives what it needs to draw the lines.
- No account, analytics or tracking. Your cookies and YouTube session are never read.
- Lyrics lookups send the song's title, artist, album and length to lrclib.net, and results are cached on your Mac.
- The extension sends data only to the Subline app on your Mac. It never runs in private windows.
Up and running in a minute
Download the app
Unzip, move Subline to Applications and open it. A ♪ appears in the menu bar and a setup window opens.
YouTube? Add the extension
Chrome, Arc, Brave, Edge or Vivaldi. Add it from the setup window, then reload your YouTube tabs.
Press play
The overlay appears on its own. Spotify and Apple Music need nothing else; macOS asks once if Subline may see what's playing.