← Back to SKILL.mdTTS Engine Selection — Decision Tree
When to pick VoiceStudio vs other engines available in this workspace. Match the user's constraint to the right column.
Decision tree
Is voice cloning required?
├─ yes → VoiceStudio (3-sec ref clip, zero-shot, 646 langs)
└─ no →
Is the language non-English?
├─ yes → VoiceStudio (646 langs) or Edge TTS (subset, cloud)
└─ no (English) →
Is privacy required (no cloud)?
├─ yes →
│ Is GPU available?
│ ├─ yes (CUDA/MPS) → VoiceStudio (best quality) or Voicebox
│ └─ no (CPU only) → kokoro-tts (2× realtime CPU) or VoiceStudio on CPU (slow)
└─ no (cloud OK) →
Is cost-no-object?
├─ yes → ElevenLabs (best polish), then OpenAI TTS
└─ no → Edge TTS (free, unofficial, MS Azure neural)
Full comparison
| Engine | Quality | Clone | Multilingual | Cost | Privacy | Setup | Best for |
|---|
| VoiceStudio | 8-9/10 | ✅ 3-sec ref | 646 langs | Free | Local | Bun + uv install | Multilingual, cloning, privacy-critical |
| ElevenLabs | 9-10/10 | ✅ 3-sec ref | 32 langs | $5-330/mo | Cloud | API key | Best English polish, fastest cloud TTS |
| Voicebox (Qwen3-TTS) | 8-9/10 | ✅ | Multi | Free | Local | Docker | Self-hosted alternative to VoiceStudio |
| Voicebox (LuxTTS) | 7/10 | ❌ | Multi | Free | Local | Docker | CPU at 150× realtime |
| kokoro-tts | 7-8/10 | ❌ | Multi (limited) | Free | Local | pip | Fast English narration on CPU |
| mlx-audio | 7-8/10 | varies | Multi | Free | Local | pip | Apple Silicon native, 14+ sub-engines |
| Edge TTS | 7-8/10 | ❌ | 50+ | Free* | Cloud | pip | Zero-friction one-off |
| OpenAI TTS | 8/10 | ❌ | Multi | $0.015/1k chars | Cloud | API key | Convenient, cheap-ish, good quality |
| Google Cloud TTS | 8/10 | ❌ | Multi | $4/1M chars (WaveNet) | Cloud | GCP project | Large free tier (1M chars/mo) |
*Edge TTS is unofficial. Microsoft could block it at any time.
When VoiceStudio wins decisively
- Voice cloning — 3-sec reference clip, zero-shot, no fine-tuning. ElevenLabs is the only competitor; VoiceStudio is free and local.
- Long-tail languages — 646 supported. ElevenLabs covers 32; everything else fewer.
- Privacy / regulatory — Nothing leaves the machine. ElevenLabs and OpenAI ship audio to their servers.
- No-API-key constraint — Local-first. No accounts.
- Bulk generation without metered cost — ElevenLabs bills per character. VoiceStudio is free at any volume.
When VoiceStudio loses
- Lowest-friction one-off TTS — Backend install + ~3 GB model + uvicorn boot. Edge TTS or OpenAI TTS is one command.
- Fast English narration on weak hardware — kokoro-tts is ~30 MB vs VoiceStudio's 2.4 GB and runs 2× realtime on CPU. Use kokoro for blog-narration batch jobs unless you need cloning.
- Streaming real-time TTS — VoiceStudio is diffusion-based and not streaming. Use Edge TTS or cloud APIs for true streaming.
- Apple Silicon-only specialized voices —
mlx-audio ships 14 engines (Kokoro, CSM, Dia, Qwen3-TTS, etc.) that may match a specific voice better.
Composition with content pipelines
VoiceStudio fits between visual asset generation and video assembly:
research → narrative → visual assets → AUDIO (VoiceStudio) → video assembly → distribution
Default for blog-post audio narration:
- English, no cloning needed, fast → kokoro-tts (cheap CPU)
- English, want a specific cloned voice → VoiceStudio with a saved profile
- Non-English → VoiceStudio
- One-time, no install → Edge TTS
For Remotion-based video pipelines that previously required ElevenLabs, VoiceStudio closes the last cloud dependency — pair it with any local image/video generator for a fully self-hosted multimedia stack.
