acx

Convert EPUB/TXT/PDF/DOCX books into professionally narrated, multi-voice audiobooks (M4B/MP3/Opus/FLAC/WAV), mastered to the ACX audio spec

Fix ACX audiobook rejection errors — RMS too low, peak too high, noise floor too high — one command, Windows/macOS/Linux, CLI + GUI.

Turn EPUB, PDF or plain text into ACX-compliant MP3 audiobooks with open-weight neural TTS. Director/Performer/Producer architecture, 36 voices, LUFS-validated output, and measured throughput: 8.3× realtime on an M1 GPU, 3.5× on CPU alone. No cloud, no per-character billing.

Local-first delivery validation for audio and video. No accounts, no uploads, no generative AI.

Batch QC for audiobook and spoken-word audio: measures level, loudness, noise, spectrum and speech structure, scores each file 0-100 and checks it against ACX and other delivery standards.