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IndexTTS-2

Default

Štandardné English Neutral IndexTTS-2

Default is a neutral AI voice powered by the IndexTTS-2 text-to-speech model. This standard-tier voice speaks English and delivers high-quality speech synthesis. With moderate generation speed and a quality rating of 4/5, Default is well-suited for emotionally expressive content, audiobooks, virtual assistants. The IndexTTS-2 engine is developed by Index Team under the Apache 2.0 license, making it safe for commercial use. Key capabilities include: emotion control, zero-shot, emotion vectors, expressive speech, fine-grained control. The IndexTTS-2 model also supports voice cloning — upload a short audio sample to create a custom voice that retains the same quality characteristics.

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IndexTTS-2Model Information

Model IndexTTS-2
Developer Index Team
Quality
Speed Medium
License Apache 2.0
Cloning Supported
Tier Standard (2 credits/1K chars)
Parameters 300M
Architecture Qwen2 + BigVGAN
Year 2025

Best Use Cases for Default

Recommended applications based on this voice's characteristics

Audiobooks & Narration

Use Default to narrate long-form content with natural prosody and expression.

Video Voiceovers

Add professional narration to YouTube videos, ads, and social media content.

Custom Brand Voice

Clone this voice style with your own audio to create a unique branded TTS voice.

E-Learning & Training

Create engaging training materials, courses, and educational content with clear AI narration.

Často kladené otázky

IndexTTS-2 is an advanced text-to-speech system that excels at zero-shot voice synthesis with fine-grained emotion control. It can generate speech with specific emotional tones like happy, sad, angry, or fearful without requiring emotion-specific training data. The model uses emotion vectors to precisely control the emotional expression of generated speech.

IndexTTS-2 was developed by Index Team and is released under the Apache 2.0 license, which permits commercial use of generated audio.

IndexTTS-2 supports 2 languages: English, Chinese.

IndexTTS-2 is in the Standard tier — 2 credits per 1,000 characters. You can preview any IndexTTS-2 voice for free before generating full audio.

IndexTTS-2 has moderate generation speed. Generation typically takes a few seconds depending on text length.

IndexTTS-2 is rated 4/5 for audio quality on TTS.ai. It produces high-quality, natural-sounding speech.

Yes, IndexTTS-2 supports zero-shot voice cloning. Upload 5-30 seconds of reference audio to create a custom voice.

Yes, IndexTTS-2 is specifically recommended for emotionally expressive content, audiobooks, virtual assistants. Its emotion control, zero-shot, emotion vectors capabilities make it an excellent choice for this use case.

Yes, IndexTTS-2 is licensed under Apache 2.0, which allows commercial use. Audio generated with IndexTTS-2 voices can be used in videos, podcasts, apps, games, and any other commercial project.

Yes, all voices on TTS.ai use commercially-licensed open-source models (MIT, Apache 2.0). The generated audio is yours to use in videos, podcasts, apps, games, and any other commercial application.

Send a POST request to /api/v1/tts/ with the model name and voice ID. See our API Documentation page for code examples in Python, JavaScript, Go, and cURL.

Yes, click the play button on this page to hear a sample. You can also type custom text on the Text to Speech page and generate a free preview with any voice.

Try Default Now

Type any text and hear it spoken by Default. Free to use.

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