Plan the night,not just the track.
Arcline reads the key, tempo, energy and phrases of every track you own, sets eight hot cues on phrase boundaries (beta), and builds sets that stay in key from first record to last.
Every track, read properly.
Drop in MP3, WAV, FLAC or M4A files. Arcline listens to the whole track, not the first thirty seconds.
- Key
Found from the harmony, after measuring how far the master is tuned off A440, so slightly sharp records still land on the right key. Shown as 1A–12B or as musical keys.
- Tempo
Locked across the whole track, so the grid holds at bar 200. Drum & bass reads 174, not 87.
- Energy
One fixed 1–10 scale built from loudness, low-end drive, brightness and tempo. A 7 means the same thing in every crate.
- Phrases
Intro, breakdown, build-up, drop and outro, found on 8-bar boundaries. Hot cues A to H (beta) land on them, and you can nudge the grid by a beat or a bar.
Your crate at a glance.
Every track becomes one line: its energy from the first bar to the last. Long intros, deep breakdowns and late drops show up before you press play.
Mix in key, by colour.
Pick a shape (warm-up, journey, peak or steady) and Arcline orders the crate so each track follows the last in key, close in tempo and on target for energy. Every transition carries a code.
- PerfectSame key.
- HarmonicOne step round the wheel, or the relative major or minor.
- Energy boostTwo steps up, or up a semitone. A deliberate lift.
- DiagonalMinor to major, one step up.
- ClashThe keys will fight. Arcline only uses one when the crate has nothing closer, and says so.
Hear the blend before the gig.
Every transition in a set has a Hear blend button. Arcline lines the two tracks up on the downbeat, matches their tempo and plays the mix the way you would.
The outgoing track, up to its mix-out point.
Up to 16 bars. The incoming track rises on its first downbeat.
Halfway through, the low end hands over so two kicks never pile up.
The incoming track on its own, so you hear where it lands.
Your music stays on your machine.
Decoding and analysis happen inside your browser. Nothing is uploaded, there is no account, and closing the tab is the end of it.
Measured on 13 house and techno tracks. Keys have not yet been checked against hand-labelled references, so treat the confidence score as part of the answer.
Coming with the desktop app.
The browser can’t write to your files. The planned desktop version can.
- Cues into your DJ software
Hot cues and memory cues exported to Rekordbox.
- Tags in the files
Key and energy written into each file’s tags, so every app you use sees them.
- Every format
AIFF and the rest, including the formats some browsers can’t decode.