Stem Supply: Stem Splitter for YouTube, Slowed and Reverb, Nightcore

Mute the singer. Mute the drummer. Slow it down and drench it in reverb. Nightcore it. Stem Supply puts one bar under every YouTube video: - MUTE VOCALS: instant karaoke, sing the lead yourself - MUTE DRUMS: drumless practice tracks from any song - MUTE MUSIC: bring the vocals forward, learn the arrangement - SLOWED + REVERB: one click, the classic slowed sound with a real convolution reverb - NIGHTCORE: one click, sped up and pitched up, lossless native speed - CUSTOM: any speed 0.5x to 1.5x, pitch, and reverb sliders, all combinable with the mutes WHY PEOPLE PICK STEM SUPPLY - 100% free. No credits, no trial, no account, no sign-in. Ever. - 100% on your device. The AI runs in your browser (WebGPU). Your audio is never recorded, saved, or uploaded. We collect no data. - Honest engineering. The AI learns the song as it plays; the whole song then replays studio-clean. - Built by a real audio company. Same engine family as Xport Studio, our offline desktop app for stems, AI vocals, and mastering. PERFECT FOR - Singers: karaoke any song on YouTube - Drummers: mute the kit, play with the band - Guitarists and bassists: mute the mix, keep your part audible - Slowed + reverb and nightcore fans: every song, your vibe, one click - Producers and DJs: hear how records are built - Language learners and transcribers: isolate the voice WANT THE ACTUAL STEM FILES? The extension is play-only inside YouTube. To split YOUR OWN tracks into downloadable stem files (vocals, drums, bass, music as separate WAVs), grab Xport Studio free at xportstudio.com. GPU-fast, batch capable, same privacy promise. PRIVACY Stem Supply processes tab audio locally with the Web Audio API and an on-device AI model. It does not collect, store, or transmit any user data or audio. It only runs on youtube.com.