CortexDJ is built, supported, and sold by one person, and there isn’t a single customer testimonial on this site. Most software pages would bury both of those facts; I’m leading with them, because what I have instead is evidence you can check yourself. Receipts, not promises.
The homepage demo is a real set: The Seams Challenge, a 40-minute set built from 11 tracks in one take — zero hands on the decks. The full set is public, with every transition timestamped. Jump straight to the seams and judge; that’s what the timestamps are for.
The changelog is public — dozens of releases from v2.12 onward, with kick-locked beatmatching, controller auto-detection, library management, mashups, natural-language set building and free license keys landing release after release. The app you get today keeps getting better — and you don’t have to take my word for the pace.
Key and energy detection is deliberately tuned to agree with Mixed In Key — the industry reference DJs already trust. You get results you can cross-check against the standard, without handing your library to a server.
There are no testimonials here because none exist yet, and I refuse to fake them. What you get instead: before big releases, the code goes through multiple adversarial review rounds — defects found and fixed before an update ever reaches you. I audit hard before I ship.
hello@cortexdj.com goes straight to the person who wrote the code. No ticket queue, no tier-1 script. I reply within 24 hours — and I can fix what I find.
Everything analyzes locally on your machine. Your library never uploads anywhere — not to me, not to anyone. That’s a design decision, not a settings toggle.
A big company can absorb one unhappy customer; I can’t. So the home tier is free forever, Pro cancels anytime, and Lifetime carries a 30-day money-back guarantee.
Start with the free forever tier, or listen to The Seams Challenge first. Pro is $7.45/month (cancel anytime); Lifetime is $127 with a 30-day money-back guarantee — checkout handled by Lemon Squeezy.