StoryVox Pro turns your written manuscripts into professional-quality audiobooks using Supertonic 3 — one of the most advanced local text-to-speech engines available, delivering near ElevenLabs quality without a monthly subscription. Everything runs on your PC. No internet required. No cloud processing. No per-word fees. Your manuscripts and audiobooks never leave your computer. VOICE QUALITY Powered by Supertonic 3, a state-of-the-art multilingual AI engine that delivers natural prosody, expressive delivery, and consistent vocal character — comparable to premium cloud services like ElevenLabs, without the ongoing cost. UNLIMITED VOICES Ten premium built-in voices are included from the start. Go further with Voice Studio — create custom voice styles from any short audio sample. Build a personal library of AI narrators tailored to your books, with no per-voice fees, ever. 31 LANGUAGES Narrate in English, Spanish, French, German, Japanese, Korean, Arabic, Hindi, Portuguese, Italian, Dutch, Russian, Polish, Swedish, Turkish, Vietnamese, Ukrainian, Romanian, Greek, Czech, Hungarian, Finnish, Danish, and more — all from the same set of voices. PROFESSIONAL M4B EXPORT Export finished audiobooks in M4B format with embedded chapter markers, cover art, author metadata, and custom bitrate — ready for direct distribution, your own website, or platforms that accept AI-generated audio. WAV export also included. PROJECT MANAGER Work on multiple books simultaneously. Each project stores its own chapters, voice settings, and scripts. Switch between projects instantly and pick up exactly where you left off. FINE-TUNED CONTROL Adjust speech rate, pacing gap, and synthesis quality. Preview any chapter live, edit scripts directly in the app, and regenerate individual sentences without re-doing the whole chapter. Save and reload scripts between sessions. SCRIPT EDITING Edit your manuscript text directly in the app. Control pauses with punctuation — commas, em dashes, periods, and ellipses all produce natural pauses in the final audio. Save scripts per chapter for easy iteration. 100% OFFLINE No internet required at any point. No subscription. No usage monitoring. Complete creative and commercial privacy from first launch to final export. VOICE CLONER — FREE FOR STORYVOX PRO OWNERS StoryVox Pro owners receive Voice Cloner, a companion tool that creates custom AI narrators from short audio samples using GPU-accelerated local training. Cloned voices install directly into StoryVox Pro. Requires NVIDIA GPU with 8 GB or more VRAM for training; playback of cloned voices works on any PC. ALSO AVAILABLE StoryVox — 53-voice entry-level version at $19.95. Search "StoryVox" in the Microsoft Store. SYSTEM REQUIREMENTS Windows 10 or Windows 11 (64-bit). GPU recommended (NVIDIA CUDA) for best synthesis performance — CPU fallback included so the app runs on any Windows PC. No internet required after installation. LICENSING StoryVox Pro uses open-source components including Supertonic 3 (OpenRAIL-M), ONNX Runtime (MIT), Qt 6 (LGPLv3), FFmpeg (LGPLv2.1), mp4v2 (MPL 1.1), and 7-Zip (LGPLv2.1). Full license texts are embedded in the application and accessible from Help → Licenses & Legal. Built by Daniel E. Gain at Gain Publications. Learn more at storyvoxpro.com.