Supertonic 3 vs Voicebox
Supertonic 3
supertonic3.github.io
Voicebox
voicebox.shSide by side
| Figure | Supertonic 3 | Voicebox |
|---|---|---|
| Price from | — | $1/mo |
| Free plan | — | Yes |
| Free trial | — | — |
| Open source | — | Yes |
| Web | Yes | Yes |
| Windows | Yes | Yes |
| macOS | Yes | Yes |
| Linux | Yes | Yes |
| iOS | Yes | Yes |
| Android | Yes | Yes |
| API | Yes | Yes |
| Self-hosted | Yes | Yes |
| Plans published | 0 | 3 |
| Spec score · Text-to-speech tools | 7.9 (#120) | 9.4 (#2) |
| Spec score · Text-to-Speech Software | 7.5 (#164) | 8.7 (#32) |
| API | The maker links a Supertone API for expressive voice generation across 31 languages with adjustable speech controls. | Voicebox exposes a local REST API for speech generation, voice profiles, model status, generation history, and health checks. |
| API access | Yes | Yes |
| Commercial use | The model weights use OpenRAIL-M, which allows commercial use subject to use restrictions and attribution requirements. | Yes |
| Free plan | Yes | Yes |
| Product | Supertonic 3 is a 99M-parameter open-weight multilingual text-to-speech model that runs locally on CPU using ONNX Runtime. | Voicebox is a free, open-source local AI voice studio for voice cloning, speech generation, dictation, and agent voice output. |
| Voice cloning | The linked Voice Builder supports zero-shot cloning by recording or uploading a short reference and synthesizing across 31 languages. | It can clone a voice from a few seconds of audio supplied by upload, microphone recording, or system-audio capture. |
Plans
In their own words
Supertonic 3
Supertonic 3 has no write-up on Specifiction yet; its figures are above.
Voicebox
Voicebox is a free, open-source local AI voice studio for voice cloning, speech generation, dictation, and agent voice output. Its desktop app can clone a voice from as little as three seconds of audio, supplied by file, microphone recording, or system capture. The maker lists seven text-to-speech engines for cloning, preset voices, and delivery control. A timeline editor supports multi-voice narratives, arranging tracks, trimming clips, and mixing conversations; effects include pitch shift, reverb, delay, and compression. Dictation uses a global shortcut to send transcripts to the focused text field or clipboard, with local Whisper models supporting 99 languages. MCP-aware agents such as Claude Code, Cursor, and Cline can speak through Voicebox, and a local REST API provides speech generation and related functions. The privacy policy says the offline desktop app requires no account and does not send recordings, profiles, transcripts, generations, or settings to the maker. Local is free with unlimited local generations and captures. Cloud and mobile sync are marked as coming soon, and cloud pricing and limits are not final.