Voicebox and Avocado share an idea: a proper voice studio that runs on your own computer, free. They make different choices about what goes in.
Voicebox goes wide on platforms
Voicebox runs on Mac, Windows and Linux. It bundles seven speech engines, clones from a few seconds of audio, has dozens of preset voices, and its Stories editor lays out several voices on a multi-track timeline. Developers get a local API and an MCP server. Its code is published on GitHub under the MIT licence.
Avocado goes deep on the Mac
Avocado is a Mac app that works with 39 families of open voice models that you add yourself, from tiny fast ones to large expressive ones. Beyond cloning and voice design, it can train a model on one to thirty minutes of your own speech, edit the emotion or pace of a finished take, generate sound effects, and keep everything in projects with tags and history.
The short version
On Windows, Linux or an Intel Mac, or want a timeline? Choose Voicebox. On an Apple silicon Mac and want the most models, training and take editing? Choose Avocado.