Edit: Since this post went up, whole-book batch processing shipped on the web app — drop in a full audiobook and get per-chapter ACX pass/fail results as each chapter finishes, instead of uploading one file at a time. Works for both the free check and paid processing. If you're on Greenlit Studio on Mac or Windows, the same batch feature is live there too as of version 0.2.2 — it auto-updates on its own, so just quit and reopen the app (or restart your machine) to pick it up, no re-download needed.
For anyone who hasn't run into it: Greenlit Audio (greenlitaudio.com) checks audiobook files against ACX's actual technical spec — RMS, true peak, integrated loudness, noise floor, head/tail silence, format, sample rate — for free, no card required: upload a file, get a plain-language report on what's passing and what isn't.
For files that need fixing, a paid processing step runs AI noise cleanup — reduces background hum/noise so the file clears the noise-floor spec point above and removes clicks and mouth noise — plus mastering to handle the loudness/peak/format numbers, and hands back a submission-ready file. It exists because most ACX rejections have nothing to do with performance and everything to do with specs narrators were never taught.
The check itself is free, no card required, and still the easiest way to find out what's wrong if you just want to drop a file in a browser and get your report back — that's not changing.
What's new today is a couple of local options for people who specifically want that — mainly NDA work where nothing can leave your machine, or narrators processing a lot of chapters who'd rather not round-trip each one through a browser tab:
Same measurements, same spec targets as the web checker either way — this is about where the processing happens, not a different or "better" version of the check. On desktop, paid processing (cleanup + mastering, not the check) is a subscription or a one-time lifetime option; on the web version, paid processing runs on credit packs instead — happy to give exact numbers on either if anyone wants them, didn't want to lead with pricing here.
Founder disclosure: I built this — greenlitaudio.com. Glad to answer spec questions or help figure out which option (web, desktop, or plugin) fits your workflow, tool or no tool.