Voice cloning — teaching software to speak in a specific person's voice from a short sample clip — used to require either a paid API like ElevenLabs or a research-grade setup with a beefy GPU. KokoClone and VITS EVOlution are both free, open-source attempts to close that gap on ordinary hardware, and both list each other as the closest alternative. They split on what they optimize for: breadth of languages versus raw CPU speed.
KokoClone: clone a voice into 8 languages from a few seconds of audio
KokoClone clones a voice from just 3-10 seconds of reference audio and can then generate speech from it in 8 languages (English, Hindi, French, Japanese, Chinese, Italian, Portuguese, Spanish). It runs on a laptop CPU or an NVIDIA GPU, and there's a ready-to-use demo on Hugging Face Spaces if you want to try it before installing anything.
For who: developers and content creators who want multilingual voice cloning without paying for an API.
Price: Free, Apache 2.0 license.
Forces: zero-shot cloning from a very short clip, genuine multilingual support across 8 languages, runs on CPU or GPU, no heavy infrastructure required, live demo available.
Limites: audio segments are capped at roughly 8.9 seconds per chunk due to positional-embedding limits, local setup (PyTorch + ONNX) is heavier than the smallest TTS models, and it's a young project (192 GitHub stars) with no commercial support.
Verdict: the better pick if you need voice cloning across multiple languages and can tolerate a slightly heavier local setup.
VITS EVOlution: 5.6x real-time on plain CPU, no GPU at all
VITS EVOlution also clones voices from a reference clip, but optimizes hard for CPU speed instead of language breadth — it runs 5.6x faster than real-time on a plain CPU, with no GPU needed at all, and can be exported to ONNX for deployment on embedded or edge devices.
For who: developers who need real-time voice cloning on CPU-only hardware — edge devices, embedded systems, or offline apps.
Price: Free, Apache 2.0 license.
Forces: genuinely fast CPU inference (5.6x real-time), zero-shot cloning plus voice mixing by averaging embeddings, ONNX export for edge/embedded deployment, permissive license with a Gradio interface included.
Limites: extremely young project (9 GitHub stars, 4 commits at time of writing), documentation is thin compared to more established alternatives, and audio segments are similarly capped by positional-embedding limits.
Verdict: the right choice specifically when CPU-only real-time speed matters more than language coverage or project maturity — otherwise KokoClone is the safer, more established bet.
Side-by-side
| KokoClone | VITS EVOlution | |
|---|---|---|
| Languages | 8 (EN, HI, FR, JA, ZH, IT, PT, ES) | Not language-specific (voice cloning focus) |
| Hardware | CPU or NVIDIA GPU | CPU only (5.6x real-time) |
| Edge/embedded deployment | Not a focus | Yes, via ONNX export |
| GitHub traction | 192 stars | 9 stars, 4 commits |
| License | Apache 2.0 | Apache 2.0 |
| Interface | Hugging Face Spaces demo | Gradio interface included |
Which one should you actually pick?
Go with KokoClone if you need to clone a voice and generate speech across several languages, or if you'd rather build on a project with more real-world usage behind it. Go with VITS EVOlution only if your actual constraint is CPU-only real-time inference for an edge or embedded deployment — that's the one thing it's specifically built to do faster. Both are free, both cap audio chunks around 9 seconds, and neither has commercial backing, so treat either as a project to build on top of, not a finished product to depend on blindly.