Beatnex Mix Engine — Free DJ Track Analysis & Set Builder
Drop your tracks in the browser and get instant BPM, musical key on the Camelot wheel, energy level, and waveform for every file. Then let the set builder assemble a harmonic DJ set for techno, trance, or house — matched by key compatibility, tempo range, and energy flow.
Open Mix Engine — free, no signup →
Hear it yourself
This transition was built and mixed entirely by Mix Engine — analyzed in the browser, set-built by the engine, stem-mixed on a cloud GPU. No human hands.
Liinus – Feel Again → KoTt. – Let it go · Beatskip Collective
E♭ minor (2A) into D minor (7A) across an 11 BPM gap — the engine picked an eight-bar cut rather than a long blend, and rode the tempo from 134 down to 123. The full nine-minute render took under five minutes on a cloud GPU.
It teaches you the mix
Mix Engine doesn't replace your mixing — it shows its work so you can learn it. Every transition it builds comes with a lesson.
Every transition, explained
What the engine saw — the two keys and how far apart they sit on the Camelot wheel, the tempo gap, how much outro it had to work with — then why it chose that blend over a longer or shorter one. Underneath, numbered steps to play it by hand: where to start the incoming track, how far to move each pitch fader, which EQ moves at which bar, and where the outgoing leaves.
Practice in Rekordbox
Export the set as a Rekordbox playlist with a labelled memory cue at every transition point — MIX IN, BASS SWAP, OUT — and the pitch move written into the cue name. Load it on your own decks, play the transition yourself, and use the rendered mix as your reference for how it should sound.
“On the downbeat: take the outgoing's low EQ to zero and open the incoming's at the same moment. One movement, both hands.”
From the lesson for the transition you just heard — step 4 of 5.
What it does
- BPM detection with confidence scoring — validated against professional DJ software
- Key detection tuned for electronic music, mapped to the Camelot wheel for harmonic mixing
- Energy analysis (1–10) weighted for kick and bass presence
- Genre-aware set building — techno, trance, and house presets with genre-true energy arcs
- Target-length sets (60 / 90 / 120 minutes) or reorder your own selection
- Transition scoring between every pair of tracks: key relation and BPM delta
- Preview playback and waveform seeking, right in the crate
- A lesson per transition — keys, tempo gap and available outro, the reasoning behind the blend, and numbered steps with the EQ moves and the bar each lands on
- Rekordbox practice export — memory cues on every mix-in, bass swap and exit, to practice on your own decks against the rendered mix
Your files stay on your device
Everything runs locally in your browser — analysis, set building, playback. No uploads, no cloud processing, no account required. Your unreleased promos and purchased tracks never leave your machine.
Built by DJs, part of BeatNex
Mix Engine is built by the team behind BeatNex, the music ecosystem run daily by an independent label group. It pairs naturally with BeatNex for DJs, where verified DJs receive curated promos from labels.
Frequently asked questions
What does Mix Engine analyze?
BPM with confidence, key on the Camelot wheel, energy 1–10, duration, waveform — plus genre and artist read from your files' tags.
Does Mix Engine upload my music?
No. All analysis runs locally in your browser. Files never leave your device.
What genres does it support?
Set presets for techno, trance, and house including subgenres (peak time, melodic, progressive, tech house, deep house). Analysis works on any electronic music.
What does it cost?
Nothing — it's free at mix.beatnex.net, no signup required.
Can Mix Engine teach me to mix?
That's a lot of what it's for. Every transition it builds comes with a lesson: what it saw in the two tracks — keys and how far apart they sit on the Camelot wheel, the tempo gap, how much outro the outgoing track had to work with — why it chose that blend length, and numbered steps to perform the transition by hand, including which EQ moves happen at which bar. You can also export the set to Rekordbox with labelled memory cues at every mix-in, bass swap and exit, then practice the transition on your own decks with the rendered mix as your reference for how it should sound.