Upload your audiobook
with 100% confidence.
Drag your chapters in and get a clear pass/fail PDF in seconds. DubCheck verifies RMS, true peak and noise floor against strict Audible and ACX standards, every single chapter, before you hit submit. Never re-edit a rejected file again.
No account · just your email · runs locally · macOS
Watch DubCheck run on a real ACX chapter.
Drop a file. Get the verdict.
The same engine professional broadcasters use, packaged into a tool a solo narrator can run in under 10 seconds. No DAW plugin. No cloud. No login.
Drop your chapter
WAV, MP3, FLAC or AIFF. One file or a whole audiobook batch. Files never leave your machine.
DubCheck runs the spec checks
RMS, peak, noise floor and room tone are measured against ACX, Spotify Audiobooks or Storytel specs in seconds.
Get a clear PDF report
Pass / fail per chapter. Specific values for every measurement. Clear notes if something is out of range.
Fix and re-check
Adjust your master in your DAW, drop the file in again, verify it passes before you upload to ACX.
Free for a chapter. €29 once for the whole book.
Check any chapter against ACX, Storytel, Spotify Audiobooks or Podtrac for nothing. Pay once, only if you want to run the whole audiobook in one pass.
DubCheck
Check a delivery against any platform spec and walk away with a signed PDF.
- All 20 spec profiles across 11 platforms
- One file per run
- Signed PDF report per file
- Runs entirely on your machine, nothing uploaded
- No account, no card, no expiry
DubCheck Batch
Same app, no file limit. Drop a season or a whole audiobook and get one summary across the batch.
- Everything in Free
- Unlimited files per run — drop a whole folder
- Batch summary report across every file
- One payment, key is yours for good
- Free updates, including new platform specs
Batch is free to try for 7 days from inside the app. No card, no signup.
What people in post are saying.
Early reactions from mix engineers we've been talking to during development. Independent pros, no commercial relationship.
“Genuinely love the idea - this is the kind of safety net we have been missing.”
“Can’t wait to check it out. A deterministic pre-check is exactly what delivery prep has been crying out for.”
Mixing for Netflix, Apple TV+, Disney+ or Prime?
Same app, same download, no second purchase. DubCheck ships every spec in one binary, so the profiles for NOLS, Apple TV+, Disney+, Prime Video, EBU R128 and ATSC A/85 are already sitting in the dropdown next to your ACX ones. Multi-spec in one pass, audit-ready PDF.
Frequently asked questions.
Anything else? Email info@audio-dubcheck.com I read every message personally.
No. DubCheck guarantees that the four measurable specs ACX cares about (RMS, peak, noise floor and room tone) are correctly measured and reported. ACX may still reject a file for content-quality reasons (mouth clicks, breath issues, performance, lip-sync). What DubCheck eliminates are the technical reject reasons. Your ear handles the rest. Read the full guide to every technical ACX reject reason →
The measurement engine is built on ITU-R BS.1770-4 algorithms and validated against the official EBU 3341/3342 reference test set. All 66 reference tests pass within ±0.1 LU tolerance. This is the same standard used by professional broadcasters and streaming QC houses.
No. DubCheck runs locally on your machine. Files never leave your computer, never upload to a server, never get cached in a cloud. This is intentional, it solves the NDA and confidentiality concerns many professional narrators have.
DubCheck covers ACX (Audible), Spotify Audiobooks, Storytel, Podtrac and EBU R128. New platform specs are added based on what customers need - drop us a note if a spec is missing. Most can be added quickly because specs are defined as data, not code.
WAV (PCM 16/24/32-bit), MP3 (192 kbps, the ACX delivery format), FLAC and AIFF. Both your unmastered source files and finished ACX-format MP3s work. You can verify the spec at every stage of your workflow.
Better than that: the app is free. Single chapters against ACX, Spotify Audiobooks, Storytel or Podtrac, full PDF report, no account and no expiry. You can also start 7 days of batch checking from the License screen inside the app whenever you want to run a whole book, and when those end nothing locks - you just drop back to one chapter per run.
ACX Check (Tony Maro) is a great free tool and we respect it. DubCheck differs in three ways: the measurement engine is EBU-certified rather than ad-hoc, the report is a clean PDF you can share with your producer or coach, and it covers multiple platforms in one tool (ACX, Spotify, Storytel, EBU R128) rather than ACX-only.
Every customer gets direct email access to the developer. Feedback shapes the roadmap directly. The Pro tier includes priority support with a 24-hour response time.
Missing a delivery spec? Question about the report?
DubCheck is constantly being extended with new platform specs. Reach out directly if you need a specific standard for an upcoming project, or want to share feedback.
Send a messageinfo@audio-dubcheck.com