The open-source voice synthesis studio.
Clone voices. Generate speech. Apply effects. Build voice-powered apps.
All running locally on your machine.

voicebox.sh • Docs • Download • Features • API

Click the image above to watch the demo video on voicebox.sh

Voicebox is a local-first voice cloning studio — a free and open-source alternative to ElevenLabs. Clone voices from a few seconds of audio, generate speech in 23 languages across 5 TTS engines, apply post-processing effects, and compose multi-voice projects with a timeline editor.

• Complete privacy — models and voice data stay on your machine
• 5 TTS engines — Qwen3-TTS, LuxTTS, Chatterbox Multilingual, Chatterbox Turbo, and HumeAI TADA
• 23 languages — from English to Arabic, Japanese, Hindi, Swahili, and more
• Post-processing effects — pitch shift, reverb, delay, chorus, compression, and filters
• Expressive speech — paralinguistic tags like [laugh], [sigh], [gasp] via Chatterbox Turbo
• Unlimited length — auto-chunking with crossfade for scripts, articles, and chapters
• Stories editor — multi-track timeline for conversations, podcasts, and narratives
• API-first — REST API for integrating voice synthesis into your own projects
• Native performance — built with Tauri (Rust), not Electron
• Runs everywhere — macOS (MLX/Metal), Windows (CUDA), Linux, AMD ROCm, Intel Arc, Docker

View all binaries →

Linux — Pre-built binaries are not yet available. See voicebox.sh/linux-install for build-from-source instructions.

Five TTS engines with different strengths, switchable per-generation:

Only Chatterbox Turbo interprets paralinguistic tags like [laugh] and [sigh]. Qwen3-TTS, LuxTTS, Chatterbox Multilingual, and HumeAI TADA read them literally as text.

With Chatterbox Turbo selected, type / in the text input to open the tag inserter and add expressive tags inline with speech:

[laugh] [chuckle] [gasp] [cough] [sigh] [groan] [sniff] [shush] [clear throat]

8 audio effects powered by Spotify's pedalboard library. Apply after generation, preview in real time, build reusable presets.

Ships with 4 built-in presets (Robotic, Radio, Echo Chamber, Deep Voice) and supports custom presets. Effects can be assigned per-profile as defaults.

Text is automatically split at sentence boundaries and each chunk is generated independently, then crossfaded together. Works with all engines.

• Configurable auto-chunking limit (100–5,000 chars)
• Crossfade slider (0–200ms) for smooth transitions
• Max text length: 50,000 characters
• Smart splitting respects abbreviations, CJK punctuation, and [tags]

Every generation supports multiple versions with provenance tracking:

• Original — clean TTS output, always preserved
• Effects versions — apply different effects chains from any source version
• Takes — regenerate with a new seed for variation
• Source tracking — each version records its lineage
• Favorites — star generations for quick access

Generation is non-blocking. Submit and immediately start typing the next one.

• Serial execution queue prevents GPU contention
• Real-time SSE status streaming
• Failed generations can be retried
• Stale generations from crashes auto-recover on startup

• Create profiles from audio files or record directly in-app
• Import/export profiles to share or back up
• Multi-sample support for higher quality cloning
• Per-profile default effects chains
• Organize with descriptions and language tags

Multi-voice timeline editor for conversations, podcasts, and narratives.

• Multi-track composition with drag-and-drop
• Inline audio trimming and splitting
• Auto-playback with synchronized playhead
• Version pinning per track clip

• In-app recording with waveform visualization
• System audio capture (macOS and Windows)
• Automatic transcription powered by Whisper (including Whisper Turbo)
• Export recordings in multiple formats

• Per-model unload to free GPU memory without deleting downloads
• Custom models directory via VOICEBOX_MODELS_DIR
• Model folder migration with progress tracking
• Download cancel/clear UI

Voicebox exposes a full REST API for integrating voice synthesis into your own apps.

# Generate speech
curl -X POST http://localhost:17493/generate \
  -H "Content-Type: application/json" \
  -d '{"text": "Hello world", "profile_id": "abc123", "language": "en"}'

# List voice profiles
curl http://localhost:17493/profiles

# Create a profile
curl -X POST http://localhost:17493/profiles \
  -H "Content-Type: application/json" \
  -d '{"name": "My Voice", "language": "en"}'

Use cases: game dialogue, podcast production, accessibility tools, voice assistants, content automation.

Full API documentation available at http://localhost:17493/docs.

See CONTRIBUTING.md for detailed setup and contribution guidelines.

git clone https://github.com/jamiepine/voicebox.git
cd voicebox

just setup   # creates Python venv, installs all deps
just dev     # starts backend + desktop app

Install just: brew install just or cargo install just. Run just --list to see all commands.

Prerequisites: Bun, Rust, Python 3.11+, Tauri Prerequisites, and Xcode on macOS.

just build          # Build CPU server binary + Tauri app
just build-local    # (Windows) Build CPU + CUDA server binaries + Tauri app

The multi-engine architecture makes adding new TTS engines straightforward. A step-by-step guide covers the full process: dependency research, backend protocol implementation, frontend wiring, and PyInstaller bundling.

The guide is optimized for AI coding agents. An agent skill can pick up a model name and handle the entire integration autonomously — you just test the build locally.

voicebox/
├── app/              # Shared React frontend
├── tauri/            # Desktop app (Tauri + Rust)
├── web/              # Web deployment
├── backend/          # Python FastAPI server
├── landing/          # Marketing website
└── scripts/          # Build & release scripts

Contributions welcome! See CONTRIBUTING.md for guidelines.

1. Fork the repo
2. Create a feature branch
3. Make your changes
4. Submit a PR

Found a security vulnerability? Please report it responsibly. See SECURITY.md for details.

MIT License — see LICENSE for details.

voicebox.sh