IndexTTS2
IndexTTS2 costs $0.0096/req on FairStack — a text to speech model for Voice cloning, Audiobook narration, Character voice preservation. No subscription required. Pay per generation with full REST API access. FairStack applies a transparent 20% margin on infrastructure cost so you always see the real price.
What is IndexTTS2?
IndexTTS2 is FairStack's self-hosted voice cloning model delivering the highest fidelity to reference audio available on the platform. The model produces natural-sounding speech that closely matches the tone, cadence, timbre, and unique character of the provided voice sample, making it the best choice when preserving the distinctive qualities of a specific voice is critical. The model works with all 168 voices in FairStack's library and accepts custom reference audio for cloning. Unlike some voice cloning models that require a reference text transcript, IndexTTS2 works from audio alone, simplifying the cloning workflow. Self-hosting ensures low latency when the model is warm and eliminates third-party API costs. Compared to Qwen3-TTS which offers both voice design and cloning, IndexTTS2 focuses exclusively on cloning with superior reference fidelity. Against cloud-based voice cloning services, self-hosting provides cost advantages and privacy benefits. Best suited for voice cloning, audiobook narration in a specific voice, and character voice preservation where maximum fidelity to the reference voice is the priority. Available on FairStack at infrastructure cost plus a 20% platform fee.
Key Features
What are IndexTTS2's strengths?
What are IndexTTS2's limitations?
What is IndexTTS2 best for?
How much does IndexTTS2 cost?
How do I use the IndexTTS2 API?
curl -X POST https://api.fairstack.ai/v1/generations/voice \
-H "Authorization: Bearer $FAIRSTACK_API_KEY" \
-H "Content-Type: application/json" \
-d '{
"model": "indextts2",
"prompt": "Your prompt here"
}'import requests
response = requests.post(
"https://api.fairstack.ai/v1/generations/voice",
headers={
"Authorization": f"Bearer {FAIRSTACK_API_KEY}",
"Content-Type": "application/json",
},
json={
"model": "indextts2",
"prompt": "Your prompt here",
},
)
result = response.json()
print(result["url"])const response = await fetch(
"https://api.fairstack.ai/v1/generations/voice",
{
method: "POST",
headers: {
Authorization: `Bearer ${process.env.FAIRSTACK_API_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({
model: "indextts2",
prompt: "Your prompt here",
}),
}
);
const result = await response.json();
console.log(result.url);Frequently Asked Questions
How much does IndexTTS2 cost?
IndexTTS2 costs $0.0096/req on FairStack as of 2026-03-23. This price includes FairStack's transparent 20% margin on infrastructure cost. No subscription or monthly fee — you pay per generation only. Minimum deposit is $1.
What is IndexTTS2 and what is it best for?
IndexTTS2 is FairStack's self-hosted voice cloning model delivering the highest fidelity to reference audio available on the platform. The model produces natural-sounding speech that closely matches the tone, cadence, timbre, and unique character of the provided voice sample, making it the best choice when preserving the distinctive qualities of a specific voice is critical. The model works with all 168 voices in FairStack's library and accepts custom reference audio for cloning. Unlike some voice cloning models that require a reference text transcript, IndexTTS2 works from audio alone, simplifying the cloning workflow. Self-hosting ensures low latency when the model is warm and eliminates third-party API costs. Compared to Qwen3-TTS which offers both voice design and cloning, IndexTTS2 focuses exclusively on cloning with superior reference fidelity. Against cloud-based voice cloning services, self-hosting provides cost advantages and privacy benefits. Best suited for voice cloning, audiobook narration in a specific voice, and character voice preservation where maximum fidelity to the reference voice is the priority. Available on FairStack at infrastructure cost plus a 20% platform fee. IndexTTS2 is best for Voice cloning, Audiobook narration, Character voice preservation. Available via FairStack's REST API with curl, Python, and Node.js SDKs.
Does IndexTTS2 have an API?
Yes. IndexTTS2 is available via FairStack's REST API at api.fairstack.ai. Send a POST request to /v1/generations/voice with your API key and prompt. Works with curl, Python requests, Node.js fetch, and any HTTP client. No SDK installation required.
How does IndexTTS2 compare to other voice models?
IndexTTS2 excels at Voice cloning, Audiobook narration, Character voice preservation. It is a text to speech model priced at $0.0096/req on FairStack. Key strengths: Best voice character preservation, No ref_text required (unlike Qwen3-TTS). Compare all voice models at fairstack.ai/models.
What makes indextts2 stand out from other image generators?
indextts2 stands out with best voice character preservation and no ref_text required (unlike qwen3-tts).
What are the known limitations of indextts2?
Key limitations include: clone-only — no preset voices; requires reference audio. FairStack documents these transparently so you can choose the right model for your workflow.
What features does indextts2 support?
indextts2 offers: highest clone fidelity; natural prosody; self-hosted for privacy; works with all 168 library voices. All capabilities are accessible through both the FairStack web interface and REST API.