Turn any song into a backing track.
Split any song into vocals, drums, bass and the rest. Mute your part, slow it down, loop the hard part, play along. Works offline. Free forever — no account, no subscription.
How it works
From a song file to a practice session in minutes.
1
Pick a song you love
Drag in any audio file from your computer: MP3, WAV, FLAC, M4A and more.
2
unmxr takes it apart
Vocals, drums, bass and the rest, loaded into a mixer built for practice.
3
You're in the band now.
Play along, or slow down and loop the hard parts until you nail them.
Practice tools
Everything you need to learn songs, become a better musician — or just have a blast playing.
Two of the best feelings in music: playing as part of the band, and the day the riff you've been stuck on finally clicks. unmxr is built for both.
Mix the stems
Set the volume of each stem, mute it or solo it. Build the backing track you need for today's practice — and change it whenever you like. Playing along with the real band never gets old.
Learn more about stem separation
Slow it down
If you've never practiced a hard part at half speed, you don't know what you're missing. Slow it down until you can play it, then speed it up a little at a time. Once you've tried it, you won't go back.
Learn more about changing the tempo
Change the key
If a song is tuned down, you can move it up a semitone and skip the retuning. If you sing, you can move it to a key that feels comfortable.
Learn more about changing the key
Loop the hard part
Loops snap to the beat and run without a gap, so you can play over the chorus again and again without a hiccup. unmxr finds the verses and choruses for you, and you can save the parts you're working on. unmxr makes practicing easier, but the work is yours: keep at it, and the part you couldn't play becomes the part you can.
Learn more about loops and sections
A metronome that follows the song
The click is built from the song's own beats, detected automatically, so it follows the band rather than a fixed tempo. It works best on songs in 4/4 with a steady feel.
Learn more about the metronome
Time Trainer
Time and feel are the most underrated skills in music. How it works: the music drops out at random while you keep playing; when it comes back, you'll hear whether you held the time. That's how you train your inner clock.
Learn more about the Time Trainer
And there's more
EQ & pan per stem
A six-band EQ and panning on every stem.
Pitch correction
Retune old, off-pitch recordings to a reference A.
Export
Single stems, your mix or the click track, as WAV, FLAC, Opus or M4A.
Your library
Every song you've split, by artist, in playlists and favorites.
Why unmxr
No subscription. No BS.
Free forever
Every feature, free — no trial, no subscription, no ads. It all runs on your computer, so there are no servers to pay for.
Works offline
Split, practice and export without an internet connection. A rehearsal room with no Wi-Fi is fine.
Opens instantly
Your songs live on your disk, not in the cloud, so they load the moment you open them.
Lossless
Keep your stems and exports lossless, as WAV or FLAC, at full quality.
Unlimited songs
Split as many as you like, as often as you like.
Private by default
No sign-up, no tracking. Your songs never leave your computer.
Built by a programmer who plays bass.
I'm a Hungarian programmer by profession and a bass player for fun. I like practicing along with real songs with the original bass line muted, so I built unmxr to do exactly that. I've been working on it for years, and it's where the two things I love doing meet.
System requirements
Runs on Mac and Windows.
Mac
macOS 13.3 or later
Apple silicon Mac
Windows
Windows 10 or 11
64-bit (x64)
How can it be free?
Everything runs on your computer, so I don't have to pay for expensive servers to keep it going. That's why it can stay free for good.
Is this a vibe-coded app?
No. I'm a senior developer with more than 15 years of experience, and I use AI as an assistant, not as a replacement for knowing what I'm doing.
Which stems does it create?
Four: vocals, drums, bass and other. Guitars, keys and everything else are in "other".
Does it need an internet connection?
No. Splitting songs, practicing and exporting all work offline.
What gear do I need to play along?
unmxr just plays the song, like any music player. You hear your instrument the way you normally do: acoustic instruments and vocals over speakers or headphones, electric guitar or bass through an audio interface with direct monitoring, or a headphone amp or amp with Bluetooth or an aux input.
Do my songs get uploaded anywhere?
Never. Everything happens on your computer, and the app doesn't send anything anywhere.
How long does splitting take?
A few minutes per song on a recent computer: a 4-minute song takes about 2½ minutes on a MacBook Pro with M2 Pro. Once a song is done, it opens instantly every time after.
Do I need a powerful graphics card?
No. Right now unmxr does all of its splitting on the CPU, so any supported computer will do. GPU support is planned for later: on reasonably recent graphics cards with 8–12 GB of memory, splitting will be a lot faster.
What audio formats can I add?
WAV, FLAC, MP3, Ogg Vorbis, Opus and MP4/M4A, up to 15 minutes long.
Can I export the stems?
Yes — single stems, your mix or the click track, as WAV, FLAC, Opus or M4A. Use unmxr with music you have the right to use. Stems are for your personal practice.
Does it work on Intel Macs?
No. On Mac, unmxr needs an Apple silicon Mac and macOS 13.3 or later.
Is there a mobile version?
Not yet — it's on the way. Until then, you can export your backing track and play it on your phone.
Pick a song. Start practicing.
Get a little better every time you play.