Narration OS

NarrationOS turns any book or any text into an audiobook, generated entirely on your own machine. Drop in a file, pick a voice, and get back a finished narration you can listen to, master, and keep. NO subscription, NO uploads, NO cloud, completely OFFLINE. Your books, performed.

Built by a solo developer who couldn't wait for an audiobook that never came, NarrationOS runs the whole pipeline locally on your GPU, powered by Resemble AI's Chatterbox voice model.

Bring any book

• Import EPUB, PDF, DOCX, RTF, TXT, Markdown, and HTML, automatically split into chapters.
• No file? Paste any text, give it a title, and narrate it in seconds.
• Scanned PDFs are handled with built-in OCR.

Your own voice

• Clone a voice from a short 10 to 15 second recording, then use it across every book.
• Cloning is consent-gated: you confirm your right to the voice, and a receipt is signed locally with your own key.
• Preview any voice before you commit it to a book.

Shape the performance

• The Narration Editor lets you fine-tune a chapter before you render: set book-wide name pronunciations and audition individual lines.
• Detect sound effects and laughter so they're voiced as real sounds instead of spelled out.
• Every change is previewed in the text before you commit. Nothing touches the audio until you press Render.

Listen your way

• A karaoke reader highlights each word as it's read. Click any line to jump there.
• Switch to a cinematic teleprompter layout for a focused, immersive read.
• Bookmarks, adjustable speed, a sleep timer, and full keyboard control.

Finish and own it

• Master your audiobook with target loudness, a clarity EQ, and a de-esser.
• Export to MP3, WAV, or chaptered M4B. Real files on your drive that you keep forever.

Runs on your hardware

• Best on NVIDIA (CUDA) GPUs, the primary and most-tested path. AMD (RDNA3/4, ROCm) are also fully GPU-accelerated. CPU-only works too, just slower.
• The AI runtime is bundled, so no internet is needed after install.
• Runs Completely OFFLINE, NO cloud, NO subscription.

An honest word from the developer

NarrationOS is a solo project and still in active development, so I'd rather be upfront than oversell it. It already does the thing I built it for: it let me finally listen to the books I wanted, in the voices I wanted, without waiting on anyone. I'll keep improving it.

What's included

• The full app, version 1.0.0. + future updates will be included in this purchase.
• No stock voices. You clone your own from a short recording during setup, so the voices on your book is of your choice.
• A sample book: The Lighthouse Keeper. An original short story written for NarrationOS, already in your library on first launch, with named characters and dialogue so you can try every feature on a real book.