Get your audiobook accepted, error-free
Send your narration and manuscript. We check the read against the text, master to spec, and certify it will pass — in an hour.
Checked against your manuscript and the published retail audio spec. Early access, pre-launch.
Ship your audiobook this month, not next quarter.
A rejection is not one email. It is another week of waiting, and a re-listen you already did once.
- Mispronounced names and skipped words slip through unnoticed.
- Retail audio specs reject files for reasons you cannot hear.
- A proofer plus a mastering engineer costs hundreds per book.
Every number ACX measures, checked before they do
A submittable, professional audiobook without a studio. We hold your files to the published spec and read along with the text, so nothing gets bounced for a reason you could not hear.
- Noise floor
- -60 dB RMS or quieter
- Peak ceiling
- -3 dB, no clipping
- Overall level
- -23 to -18 dB RMS
- Room tone
- head + tail, no gaps
- Encode
- 192 kbps+, 44.1 kHz
- Consistency
- matched to your retail sample
One upload. One hour. A file you can submit.
- 01
Send the files
Upload your finished narration — and the manuscript, if you want the read checked against the text.
- 02
We run the pass
Every chapter is measured against the spec and proof-listened for skips, mispronunciations, and stray noise.
- 03
Get a certified deliverable
Spec-passing, error-checked files and a pass report land back in your inbox — in an hour.
$69/ month
Certify your first book free while we onboard early users. Cancel any time — this is pre-launch, and your feedback shapes the release.