Hear your track mastered. Free.
Drop a track. No signup, no install.
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Open the mastering tool →Hear your track mastered. Free.
No signup, no install. Pay only if you keep it.
Judge the tone.
Not the volume.
Three steps. No plugins.
Format, headroom and clipping checked in seconds, with a plain verdict. Then pick the 30 seconds that matter.
50+ subgenre profiles from Deep House to Neurofunk, five characters — or describe the sound in plain words and the AI acts on your keywords.
A/B it against your mix. Three full re-masters with new instructions — all before a single credit is spent.
What producers said after their first master.
Amazing mastering. I spent a long time trying to master my track myself, but only the ZERRRO Engine gave me a result I was truly happy with. Really powerful tool.
Loving the mastering function, especially the different sub genres that offer different dynamics. This is genuinely one of the better AI mastering tools I've used.
I have some experience with similar tools and I have to say that I really liked this one. The editing options together with the AI model and the user-friendly environment are a great combination with interesting results. … I will definitely use it again.
I love the flexibility and being able to describe the sound I want.
I really like the depth you brought to my track!
Unedited feedback from producers who mastered a track in the beta. Genre and character are the settings they actually used.
The paywall is at the end.
Everything above is free — including the finished master, playing in your browser. Not a launch offer: previews are free, permanently. A credit only unlocks the download: every version of that track, Club and Streaming, as 24-bit WAV, re-downloadable for 12 months.
Still in beta.
And we’d rather you knew.
The engine is new and improving every week. It’s already producing great masters, but you might hit a rough edge. Hearing it costs you nothing — so you’ll know within minutes whether it works for your track. Tell us what didn’t work and we’ll fix it.
Master a track now →