index-tts
An industrial-level zero-shot text-to-speech system with cross-lingual and emotion control.
Clone voices from a single reference clip with fine-grained emotion and pronunciation control.
IndexTTS is a zero-shot text-to-speech system that clones voices from single audio clips. It supports multilingual synthesis, fine-grained emotion control, and pronunciation adjustments using phonemes.
What it is
The system generates expressive speech across Chinese, English, Japanese, Spanish, and Arabic using reference audio clips. It offers precise speaking speed scaling, duration factors, and timbre-emotion disentanglement capabilities.
Who it's for
It suits technical professionals and developers building custom text-to-speech pipelines. It does not suit non-technical users who require simple click-and-run desktop audio applications.
Key features
Zero-Shot Voice Cloning
Clones voices instantly from a single reference audio clip.
Multilingual Support
Synthesizes speech in Chinese, English, Japanese, Spanish, and Arabic.
Pronunciation Control
Manages output using Chinese Pinyin, English CMU phonemes, and Japanese Kana.
Speaking Speed Scaling
Adjusts output pacing via duration factors ranging from 0.5x to 2.0x.
Up and running in 3 steps
Our honest verdict
What's great
- Clones voices from a single short reference audio clip
- Supports fine-grained emotion and speaking speed controls
- Handles multiple languages including English, Spanish, and Arabic
- Allows production deployment via vLLM recipes
Where it falls short
- Requires managing Python environments and dependencies via uv
- Demands compatible NVIDIA GPUs with CUDA Toolkit 12.8 or newer
- May require manual configuration for optimal half-precision or DeepSpeed settings
Pricing & license
The software is open source, and the only cost is running it yourself on your own hardware resources.
Open remote AI-training roles
870 open remote AI-training roles, updated November 14, 2026; most pay $20–$170 an hour. Zekai lists them free; the application goes to the employer’s platform.
Alternatives
Use it, or have us set it up
FAQ
What languages does IndexTTS support?
IndexTTS-2.5 supports Chinese, English, Japanese, Spanish, and Arabic.
How do I control pronunciation?
You can control pronunciation using Chinese Pinyin, English CMU phonemes, and Japanese Kana.
Can I deploy this for production?
Yes, production deployment is supported via vLLM integration recipes.
