Murmur

Murmur is an on-device voice studio for macOS. It generates natural narration locally on the user’s Mac, with voice cloning, voice design, and a library of community voices for speech production.

The product highlights studio-quality voices, fully local processing, and support for multilingual output. It can clone a voice from a 10-second recording, and it offers more than 860 voices. The site also describes Voice Design, where a voice can be described, tuned for tone and language, previewed, and saved as a reusable local voice. In Projects, saved voices can be placed into a script-based workflow, with local clip rendering and export. Murmur also queues chapters and renders broadcast-ready audio, and it presents this as useful for podcasts, audiobooks, video narration, training content, ads, dialogue, and related production work.

Murmur runs on macOS 14+ and Apple Silicon, and it is notarized by Apple. The page states that it works locally after setup, with no cloud uploads, no third-party servers, no network calls, and no telemetry. It is sold as a one-time purchase with no subscriptions or per-word pricing, no usage caps, and a 7-day money-back guarantee.