Index-Tts

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IndexTTS is an industrial-level, zero-shot text-to-speech system that offers controllable and efficient speech synthesis. It allows for precise duration control and emotionally expressive voice generation.

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At a glance

Pricing

Open Source

Free tier

Yes

API

Skill level

Technical

About

What is index-tts?

IndexTTS is an advanced, industrial-level zero-shot text-to-speech (TTS) system designed for highly controllable and efficient speech synthesis. It introduces a novel method for precise speech duration control, crucial for applications requiring strict audio-visual synchronization like video dubbing. The system supports two generation modes: one for explicit duration control by specifying token count, and another for free autoregressive generation that faithfully reproduces prosodic features. IndexTTS also achieves disentanglement between emotional expression and speaker identity, allowing independent control over timbre and emotion. It incorporates GPT latent representations and a three-stage training paradigm to enhance speech clarity in highly emotional expressions, and offers a soft instruction mechanism based on text descriptions for emotional guidance.

Best used for

Ideal for content creators who need to generate highly expressive and precisely timed speech for various applications. Especially valuable for scenarios like video dubbing where strict audio-visual synchronization is required, or for creating voiceovers with specific emotional tones and speaker identities.

Common actions

generate speech

control speech duration

synthesize emotional voice

clone voice

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Capabilities

Key features

Precise speech duration control
Emotional expression disentanglement
Speaker identity control
Text-based emotional guidance
Zero-shot speech synthesis

Target Audience

content creator

Integrations

Not yet documented

Pricing & Plans

Open Source

Free

FAQs

What are the key advancements in IndexTTS2 compared to previous versions?

IndexTTS2 introduces precise duration control for autoregressive TTS models, allowing for both controllable and uncontrollable generation modes. It also achieves disentanglement of emotional expression and speaker identity, and incorporates a soft instruction mechanism for emotion control via text descriptions.

How can I install and run IndexTTS?

IndexTTS requires git, git-lfs, and the uv package manager for installation. After cloning the repository and installing dependencies with `uv sync`, you can run the web demo using `uv run webui.py` or integrate it into Python scripts.

Does IndexTTS support different emotional expressions?

Yes, IndexTTS allows for emotional control through either a separate emotional reference audio file or by specifying an 8-float list for emotion intensity (happy, angry, sad, afraid, disgusted, melancholic, surprised, calm). It also supports text-based emotional guidance.

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