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StemKit is a free, open-source desktop app that separates songs into stems, lets you play along with the source video, and exports the resulting audio as WAV files. It can help musicians practise a part, study an arrangement, or make a karaoke-style mix. The project says processing happens on your computer, but using its YouTube workflow comes with an important terms-of-service caveat.
What StemKit does
StemKit’s project pages describe a workflow for finding a YouTube video or pasting its link, choosing which parts to separate, and listening in a player synchronized with the video. The available stem categories are vocals, drums, bass, other, guitar, and piano. The app also offers Karaoke and Acapella presets.
Once processing is complete, you can mute or solo stems, adjust their volume, click a waveform to seek, and play the parts together or separately. You can export one stem or all stems as WAV files. The project says those files can be imported into digital audio workstations such as Ableton, Logic, FL Studio, or GarageBand; no particular DAW is required.
Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Repair Windows errors before they cause bigger problems3Scan for outdated or missing drivers - takes under a minuteThese are features described by the project, not independently measured results. The available project materials do not establish how accurately StemKit separates a specific song or instrument, so listen to the output before relying on it for practice, transcription, or a finished arrangement.
#1 Best Overall
- Next-Gen Music Production and Beat Maker Essential - USB-powered MIDI keyboard controller with 25 mini velocity-sensitive keys, optimized for studio or beat production, piano-style performance, synth leads, sample triggering
- Real-Time Control and Navigation - 8x assignable 360° knobs, a vibrant full-color screen and push/turn encoder for hands-on access to settings, presets, and DAW functions, without reaching for a computer
- Iconic MPC Pads with RGB Feedback - 8 velocity- and pressure-sensitive MPC pads deliver an iconic finger-drumming experience, plus dynamic visual feedback to match your performance in studio or on the go
- Studio Instrument Collection Included - A powerful VST/AU and standalone virtual suite packing 1000+ pro-grade drums, keys, synths, bass, FX from AIR, Akai Pro and Moog, plus MPK Mini IV integrated controls
- Pre-Mapped DAW Integration - Get producing in under 15 minutes with Ableton Live Lite 12, Logic Pro, FL Studio and more; comes with an expanded DAW-mapped transport section for uninterrupted workflow
How to use it to practise with a song
- Install StemKit and complete first-launch setup. The app may download its processing engine and other components before you can separate audio.
- Find a song. Use the built-in YouTube search or paste a video link, subject to the project’s warning about YouTube terms.
- Choose the parts you want. Select the available instruments or use a preset such as Karaoke or Acapella.
- Wait for separation to finish. StemKit describes parallel background processing with progress shown in the app.
- Listen and adjust. Use solo, mute, volume, waveform seeking, and synchronized playback to focus on the part you want to study.
- Export if needed. Save one or all stems as WAV to use elsewhere, including in a DAW.
The documented controls support listening and playing along, but the project pages do not establish a specific tempo-slowing feature. If slowing a part is essential to your practice, confirm that the version you install offers the playback control you need.
Supported computers and downloads
The README lists macOS 12 or later on Apple Silicon, Windows 10 or 11 on x64, and Linux x64 on Ubuntu 22.04 or an equivalent distribution. It lists CPU processing, NVIDIA GPU processing with CUDA, and AMD GPU processing on Linux through experimental ROCm support. Check the current project documentation for release-specific compatibility.
Rank #2
- Full Creative Control - A dynamic 37-Key MPK Mini keybed for 3 full octaves of melodic and harmonic performance; Easily connect to your DAW or studio equipment with the USB-powered MIDI Controller
- Advanced Connectivity - Connect to different sound sources with CV/Gate and MIDI I/O; Control modular gear, sound modules, synthesizers, and more to bring new sound sources into your music production
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- Record and Compose Without a Computer - Connect to your production station and use the built-in 64-step sequencer featuring one track for drums and one for melodies or chords, with up to 8 notes each
StemKit’s README says the separation engine download is approximately 2 GB. The app bundles ffmpeg and says it can download a private Python runtime during first-launch setup if Python 3.9 or later is not detected; you do not need to install Python manually. Optional quality upgrades require additional downloads: the README lists a Mel-Band Roformer model at +913 MB and a fine-tuned Demucs model at approximately +320 MB. It also describes a two-shift refinement setting that may take up to three times longer. These are approximate setup figures from the project documentation, not performance benchmarks.
Privacy: local processing, with an install-count ping
The project describes StemKit as running locally, without uploading videos, songs, the library, searches, or audio. Its README states, “Everything runs locally — no accounts, no API keys.” The same documentation discloses that the first app run sends a small POST request to a Cloudflare Worker to count installations. The listed payload includes a random install ID, app version, operating system, and architecture. The project says it does not build IP-address-based profiles or use cookies or identifiers tied to the user, and that an unsuccessful first attempt is retried on a later launch. The telemetry code is in the repository; the README says people building from source can remove the telemetry module or block the worker domain.
Rank #3
- Music Production and Beat Maker Essential -USB powered MIDI controller with 25 mini MIDI keyboard velocity-sensitive keys for studio production, virtual synthesizer control and beat production
- Total Control of your Production - Innovative 4-way thumbstick for dynamic pitch and modulation control, plus a built-in arpeggiator with adjustable resolution, range and modes
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- The MPC Experience - 8 backlit velocity-sensitive MPC-style MIDI beat pads with Note Repeat and Full Level for programming drums, triggering samples and controlling virtual synthesizer / DAW controls
YouTube use and licensing
The project README warns: “Downloading audio from YouTube violates their ToS for public products — keep this personal.” That is the project’s own warning, not a legal determination about every use or song. The available project materials do not establish whether you have permission to download, adapt, perform, or redistribute a particular track. Check the terms that apply to your use and the rights in the music before downloading or sharing audio.
The repository identifies StemKit as MIT licensed. That license applies to the project’s software; it does not grant rights to the music you process.
Rank #4
- Compact yet powerful standalone mini keyboard with built-in speaker and USB MIDI Controller capabilities for beat makers, songwriters and musicians
- 25-Key Gen 2 MPK Mini dynamic keybed, OLED Display, 8 Velocity sensitive backlit MPC drum pads, arpeggiator and note repeat, plus 4 encoder knobs deliver a professional, versatile performance
- Native Kontrol Standard (NKS) Integration - Akai Professional and Native Instruments have partnered to bring NKS support to the MPK Controller series, get ready to Kontrol straight from your MPK
- Choose Your Exclusive Complimentary NKS Bundle - Browse and control Native Instruments presets and sound libraries; select one of three curated Komplete 15 Select bundles: Beats, Band, or Electronic
- Over 100 internal drum and instrument sounds including acoustic and electric pianos, synth leads, pads and more
Who StemKit suits
- Useful if: you want a desktop workflow to isolate song parts, practise against synchronized playback, or export WAV stems for further work.
- Consider the trade-offs: first launch involves a substantial download, processing depends on your computer, and the project does not publish an independent separation-quality benchmark.
- Check before installing: confirm your operating system and processor match the listed support, and treat AMD ROCm support as experimental.
Project documentation: StemKit GitHub repository and StemKit website.
Quick Recap
Best Value
- The Creative Controller: Launchkey is an all-in-one DAW controller with premium keybeds and 16 responsive FSR pads for drumming, clip launching, and more
- Seamless DAW Integration: Launchkey works with all major DAWs, offering intuitive workflows for Ableton Live, Logic, Cubase, Reason, Reaper, FL Studio, and Ardour
- Go Beyond Finger Drumming: Launchkey’s FSR drum pads with polyphonic aftertouch also serve as step sequencers, clip launchers, chord triggers, and more
- Everything in the box: Ableton Live Lite, Cubase LE, Novation Play, sounds from GForce, Klevgrand, Orchestral Tools, Native Instruments, and free Melodics lessons
- Powerful Creative Tools: Never hit a wrong note with Scale Mode, trigger lush chords from a single key or drum pad, and create and mutate wild arpeggios
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