IndexTTS

IndexTTS is a zero-shot text-to-speech system that clones voices and provides fine-grained emotional and pronunciation control.

IndexTTS is an industrial-level controllable and efficient zero-shot text-to-speech system that clones a voice from a single reference audio clip. The latest IndexTTS-2.5 release supports Chinese, English, Japanese, Spanish, and Arabic. It features fine-grained emotion control, speaking speed control, and pronunciation control using Pinyin, CMU phonemes, or Japanese Kana. Users can run it via a WebUI, a Python API, or deploy it for production using vLLM. It is designed for developers and researchers who need expressive, multilingual emotional speech synthesis with precise duration control.

IndexTTS at a glance

Best for: Social media creator, Writer
Runs on: Web, Linux, Windows, API, CLI, self-hosted, open source
Pricing: Free and open source
Released: February 2025
Category: AI audio tool
Website: github.com/index-tts/index-tts

Key features

Clone voices from a single reference audio clip
Support Chinese, English, Japanese, Spanish, and Arabic
Control speaking speed via durationfactor
Control pronunciation using Pinyin, CMU phonemes, or Japanese Kana
Control emotion using separate reference audio, emotion vectors, or text descriptions
Production deployment supported via vLLM
Web demo and Python API

Use it for

Cloning a voice from a single reference audio clip
Generating multilingual speech in Chinese, English, Japanese, Spanish, and Arabic
Adjusting emotion intensity and speaking speed for synthesized audio
Controlling pronunciation with Pinyin, CMU phonemes, or Japanese Kana

Alternatives to IndexTTS

MOSS-TTS — Delivers zero-shot voice cloning and fine-grained pronunciation control.
Fish Audio — Provides studio-grade voice cloning and text-to-speech with emotion control.
GPT-SoVITS — It allows high-fidelity voice cloning with as little as one minute of data.
Voicebox — Perform voice cloning and generation entirely on local hardware.
VoxCPM — Provides tokenizer-free multilingual speech with controllable voice creativity.
MisoTTS — Generates high-quality conversational speech using an RVQ Transformer architecture.
Eleven v4 and Eleven v4 Turbo — Generates low latency expressive speech with real time streaming.
TTS WebUI — It offers a free web interface with over 30 AI models for audio generation.
ElevenLabs — Natural AI voices, with 10,000+ voices in 70+ languages
EmotiVoice — It supports over 2,000 distinct voices with specific emotional expression controls.
AuK — It handles zero-shot TTS, editing, and enhancement via natural language.
Superwhisper — Transcribes speech offline and online with custom AI modes and templates.

All IndexTTS alternatives