Just finished recording
your audiobook?

No. All processing runs locally in your browser via WebAssembly. Your audio files are never uploaded to a server, never stored remotely, and never accessible to anyone but you.

Your first file is free, no account or payment needed. After that, pricing depends on total audio length: under 5 hours costs $36 per finished hour, 5 to 10 hours costs $27 per finished hour, and 10+ hours costs $18 per finished hour. You see the exact price before you pay. No subscriptions, no hidden fees.

No. ChapterPass handles the measurable technical specs: loudness, peaks, noise floor, format, and silence. ACX also runs a human quality review that listens for clicks, pops, mouth noise, echo, pacing, and manuscript accuracy. Recording quality issues will still cause rejection regardless of what ChapterPass does to the technical numbers.

No. ChapterPass adjusts loudness, limits peaks, manages noise floor in silent sections, and converts to the right format. It does not edit the content of your narration. Removing clicks, pops, mouth noise, or other recording artefacts needs to happen in your recording software before you upload.

Not for the technical mastering. That is what ChapterPass replaces. You will still need a way to record and edit your narration (remove mistakes, clean up audio, add credits). That could be a DAW or a simpler audio editor like Audacity. Once your edited recording is ready, ChapterPass handles the mastering step.

All three routes produce distribution-ready files. Audacity is free and gives you full control, but you configure four effects, run a macro, and verify results manually. Hiring a mastering engineer is hands-off: you send files, you receive mastered files, typically hundreds of dollars per finished hour. ChapterPass sits between: drop a file in, get a verified file out, $18 to $36 per finished hour, first file free, files stay on your device.