Kokoro vs Chatterbox
Kokoro is a tiny fixed-voice model. Chatterbox (Resemble AI, MIT) adds zero-shot voice cloning at 350M (Turbo, English) or 500M (Multilingual) parameters. We haven't benchmarked Chatterbox yet.
Side by side
| Kokoro 82M | Chatterbox-Turbo | Chatterbox (Multilingual) | |
|---|---|---|---|
| Organization | hexgrad | Resemble AI | Resemble AI |
| Parameters | 82M | 350M | 500M |
| License | apache-2.0 source | mit source | mit source |
| Commercial use | Yes Apache-2.0; card welcomes production/commercial deployment | Yes MIT; watermarked outputs | Yes MIT; outputs carry Perth neural watermark |
| Stated memory | Not stated | Not stated | Not stated |
| Runs on CPU | Yes | Unknown | Unknown |
| Streaming | Unknown | Unknown | Unknown |
| Voice cloning | Unknown | Yes | Yes |
| Languages | 9 languages | English | 23+ languages |
| Our fastest CPU result | RTF 0.1234 kokoro-onnx fp32 (onnxruntime CPU) voice=af_heart; Cloud x86 VM, 8 vCPU Intel Xeon, 16 GB RAM, no GPU | benchmark pending | benchmark pending |
| Pi 5 | CPU supported, no device data | Unknown | Unknown |
| CPU only | Measured by us | Unknown | Unknown |
| Apple Silicon | Sourced statement | Estimate from parameter count | Estimate from parameter count |
| 8 GB GPU | Estimate from parameter count | Estimate from parameter count | Estimate from parameter count |
| 12–16 GB GPU | Estimate from parameter count | Estimate from parameter count | Estimate from parameter count |
| 24 GB+ GPU | Estimate from parameter count | Estimate from parameter count | Estimate from parameter count |
Each fact is sourced on the model's page. "Unknown" means the source doesn't say. Accuracy: Hugging Face Open TTS Leaderboard.
Key differences (sourced)
Which should you pick?
- Pick Chatterbox if you need voice cloning. We found no documented cloning for Kokoro (our data shows Unknown).
- Pick Kokoro for CPU-only or edge use: it's 4–6x smaller, and we measured it at about 8x faster than real time on an 8 vCPU CPU.
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