JustJam | Play Along with Any Song

JustJam is built for musicians who want to learn songs faster, practice more deeply, and play along with every part. Split a YouTube Music song into controllable stems on your Mac using a local AI model you download once, then keep working fully offline with your private music collection — no cloud processing, no uploads, and complete control over your audio.

How it works

From link to jam session in three moves

No DAW, no plugins, no backing-track hunting. Paste a song and start playing.

Paste a link

Drop in any YouTube Music URL. JustJam grabs a high-fidelity copy and files it in your local library.

Split into stems

A local AI model separates the track into four stems — vocals, drums, bass, and everything else — right on your Mac.

Jam on your part

Mute the guitar and take its place. Solo the drums to learn the groove. Loop, mix, and play along with every part.

Why JustJam

A practice room that fits in your dock

Everything you'd want from an expensive studio workflow, without the studio — or the price tag.

Four stems, full control

Every song becomes vocals, drums, bass, and other — each with its own volume, solo, and mute.

Practice and play along

Drop the part you play and step into the mix. Learn by ear with the parts isolated, at your own pace.

Local AI on your Mac

Download the stem-separation model once. After that, every split runs on your own hardware.

Fully offline after setup

Once the model is on your Mac, JustJam works with no connection at all. Tour bus, cabin, basement — anywhere.

Private by design

Your music collection stays on your machine. No cloud processing, no uploads, no accounts snooping on your library.

Studio power, bedroom price

Skip expensive backing tracks, sample subscriptions, and heavyweight studio suites. One app, every song.

Local-first

Your music never leaves your Mac

Most stem tools ship your audio to a server. JustJam does the opposite: the AI comes to you.

One-time model download. Grab the stem-separation model on first launch, then you're set.
No cloud processing. Every split, every mix, every playback happens on your own hardware.
Private library. Your collection lives in local files you control — no uploads, ever.
Complete audio control. High-fidelity local files you can keep, organize, and tag your way.

Made for macOS

A native Mac app — not a web page in a wrapper. Fast, tactile, and at home on Apple silicon.

Early access

Be first on stage

JustJam is in active development. Join the waitlist for early builds, or try the interactive prototype right now.

Join the waitlist Prototype demo