Pay once, per heavy job

Yes. Every tool that runs on ordinary CPU processing is free and unlimited, with full-quality downloads and no watermark — including standard vocal removal, stem splitting and standard audio-to-MIDI. Credits apply only to jobs that need a GPU, which today means Studio Quality separation, high-accuracy MIDI, transcription, and audio-to-sheet-music. Everything on cheap processing stays free and there are no plans to change that.

Most GPU jobs are a single model run and cost one credit. A few do more work for a single result — audio-to-sheet-music, for example, runs a GPU transcription, then tempo and key analysis, then engraves the score — so it costs three credits. The cost of a job tracks the work behind it, not the tool it came from.

The same job run through a heavier model. Standard separation is good enough for reference tracks, practice, and DJ edits, and it's what most people need. Studio Quality pulls cleaner stems out of dense mixes — less instrumental bleed in the vocal, less vocal ghost in the instrumental — which matters when the stem is going into a release rather than a rehearsal. Run both on the same track and keep whichever you prefer: every visitor gets free runs each month, and the tool shows how many you have left before you spend one.

No. Credits stay on your account until you use them, and they work on any tool that takes credits — including ones added after you bought them. There is no subscription, no monthly minimum, and nothing recurring to cancel.

Your credits are returned automatically. Refunds are handled server-side the moment a job reaches a failed state, and a background sweeper catches anything that never reports back at all. A three-credit job refunds all three. You never have to ask.

No. Credits are tied to your browser. You give an email at checkout only so we can match your Ko-fi payment back to you — Ko-fi's payment notification doesn't tell us who paid, so the email is the link. If you later want your credits on a different device, you can sign in with that same email.

Choose 'Already bought? Sign in' and enter the email you paid with. We'll send a sign-in link that attaches your credits to that browser. The link expires after 30 minutes. If both devices are in front of you, the account menu can show a QR code instead, which is faster.