⏱ 8 Reading Time
- 01What Is IndexTTS 2.0?
- 02What Is ElevenLabs?
- 03How Do IndexTTS 2.0 and ElevenLabs Compare on Features?
- 04How Much Do IndexTTS 2.0 and ElevenLabs Cost?
- 05Which Voice Quality Wins: IndexTTS 2.0 or ElevenLabs?
- 06Should You Choose IndexTTS 2.0 or ElevenLabs?
- 07Who Should Use IndexTTS 2.0 vs ElevenLabs?
- 08What Are the Best Alternatives to IndexTTS 2.0 and ElevenLabs?
- 09Frequently Asked Questions
IndexTTS 2.0 is a free, self-hosted, open-source text-to-speech model from Bilibili with emotion-timbre separation and token-level duration control. ElevenLabs is a paid, cloud-hosted voice AI platform with 70+ languages, professional voice cloning, and a credit-based subscription system starting at $6 per month.
What Is IndexTTS 2.0?
IndexTTS 2.0 is an open-source, autoregressive zero-shot text-to-speech model developed by Bilibili and released on September 8, 2025, built for voice cloning, emotion control, and frame-accurate speech duration matching.
Bilibili engineered IndexTTS 2.0 as a successor to IndexTTS 1.5, replacing the XTTS-based decoder with BigVGAN2 and adding a conformer-based speech conditional encoder. The model separates speaker identity from emotional expression, letting a developer clone one person’s voice and apply a different person’s emotional tone to it. IndexTTS 2.0 clones a target voice from a 5-15 second reference audio sample without additional training. The system supports two duration-control modes: an explicit token-count mode for frame-accurate dubbing sync, and a free-running autoregressive mode that preserves the prosody of the input prompt.
| Attribute | Value |
|---|---|
| Developer | Bilibili |
| Release date | September 8, 2025 |
| Architecture | Autoregressive, zero-shot TTS with conformer encoder + BigVGAN2 vocoder |
| Code license | Apache 2.0 |
| Model weight license | Custom Bilibili Index-TTS license — commercial deployment requires prior written registration with Bilibili |
| Primary languages | English, Mandarin Chinese |
| Deployment | Self-hosted (local GPU or private server) |
| Minimum hardware | GPU with 8GB VRAM (e.g., RTX 3060) |
| Pricing | Free to run; compute costs paid separately |
According to the project’s GitHub repository, the source code carries an Apache 2.0 license, but the LICENSE and DISCLAIMER files impose a separate condition on the trained model weights: commercial use of the Bilibili Index-TTS model or its derivatives requires prior registration and written authorization from Bilibili. Developers deploying IndexTTS 2.0 in a paid product must read the INDEX_MODEL_LICENSE file before shipping, not just the top-level Apache 2.0 notice.
What Is ElevenLabs?
ElevenLabs is a London-based, cloud-hosted AI voice platform founded in 2022 that provides text-to-speech, professional voice cloning, dubbing, speech-to-text, and conversational voice agents through a web app and a developer API.
Piotr Dąbkowski and Mati Staniszewski founded ElevenLabs in 2022 after working as a machine learning engineer at Google and a deployment strategist at Palantir, respectively. The platform reached an $11 billion valuation in February 2026 and now supports more than 70 languages. ElevenLabs generates speech through the Multilingual v2 model for production-grade narration and the Flash/Turbo models for low-latency, real-time voice agents.
| Attribute | Value |
|---|---|
| Company | ElevenLabs Inc. |
| Headquarters | London, UK |
| Founded | 2022 |
| Founders | Piotr Dąbkowski, Mati Staniszewski |
| Languages supported | 70+ |
| Deployment | Cloud (web app, API, SDKs) |
| Key feature | Professional Voice Cloning (PVC) + Multilingual v2 model |
| Free tier | 10,000 credits/month (~10 minutes audio), non-commercial |
| Entry paid tier | Starter, $6/month |
Source: ElevenLabs official pricing page (elevenlabs.io/pricing).
How Do IndexTTS 2.0 and ElevenLabs Compare on Features?
IndexTTS 2.0 wins on emotion-timbre disentanglement and self-hosted privacy; ElevenLabs wins on language coverage, voice library size, and production-ready cloud infrastructure.
| Feature | IndexTTS 2.0 | ElevenLabs |
|---|---|---|
| Deployment model | Self-hosted, open weights | Cloud API + web app |
| Voice cloning | Zero-shot from 5-15 second sample | Professional Voice Cloning (Creator plan and above) |
| Emotion control | Independent emotion/timbre control, natural-language emotion prompts via Qwen3 | Preset emotional delivery via Eleven v3 and Multilingual v2 |
| Duration control | Token-level explicit control, 0.75x-1.25x ratio scaling | Not available as a standalone parameter |
| Languages | English, Mandarin (multilingual-ready with fine-tuning) | 70+ languages |
| Voice library | None (bring your own reference audio) | 100,000+ community voices |
| Conversational AI agents | Not included | ElevenAgents, billed separately by call minute |
| Audio output quality | 192kbps via BigVGAN2 vocoder | Up to 192kbps (Creator plan and above) |
| API access | Local inference only, no hosted API | REST API and SDKs for Python, JavaScript, and more |
| Commercial licensing | Requires registration with Bilibili for model weights | Included on all paid tiers ($6/month and up) |
How Much Do IndexTTS 2.0 and ElevenLabs Cost?
IndexTTS 2.0 costs $0 in licensing fees but requires a GPU with at least 8GB VRAM; ElevenLabs runs six subscription tiers from $0 to $990 per month, billed through a shared credit system.
IndexTTS 2.0 charges no subscription fee. A developer running it locally pays only for electricity or cloud GPU rental — an RTX 3060-class GPU on a rented cloud instance typically costs $0.20-$0.50 per hour depending on the provider. No official hosted API or managed pricing tier exists for IndexTTS 2.0 as of July 2026.
ElevenLabs prices six tiers, according to its official pricing page:
- Free — $0/month, 10,000 credits, no commercial license
- Starter — $6/month, 30,000 credits, commercial license included
- Creator — $22/month, 121,000 credits, unlocks Professional Voice Cloning
- Pro — $99/month, 600,000 credits, 192kbps output via API and Studio
- Scale — $299/month, 1,800,000 credits, 3 seats
- Business — $990/month, 6,000,000 credits, 10 seats
- Enterprise — custom pricing, SSO and HIPAA/BAA compliance
ElevenLabs credits map to characters processed: 1 credit equals 1 character on the Multilingual v2 model, while the Flash and Turbo models cost 0.5-1 credit per character. Annual billing on any paid tier saves two months’ cost compared to monthly billing.
Which Voice Quality Wins: IndexTTS 2.0 or ElevenLabs?
ElevenLabs delivers more consistent out-of-box naturalness across 70+ languages, while IndexTTS 2.0 matches or exceeds it specifically on emotional expressiveness and dubbing-grade timing accuracy in English and Mandarin.
IndexTTS 2.0’s own published benchmarks report lower word error rate, higher speaker similarity, and stronger emotional fidelity than F5-TTS, CosyVoice2, and FireRedTTS on internal evaluation sets. ElevenLabs does not publish head-to-head benchmark numbers against open-source models but markets Eleven v3 and Multilingual v2 as its flagship models for narration and dubbing. For English and Mandarin dubbing work where audio must lock to a fixed video timecode, IndexTTS 2.0’s token-level duration control gives frame-accurate sync that ElevenLabs’ current model lineup does not expose as a direct parameter. For projects spanning 70+ languages or requiring a plug-and-play API without local GPU management, ElevenLabs delivers faster time-to-production.
Should You Choose IndexTTS 2.0 or ElevenLabs?
Choose IndexTTS 2.0 for self-hosted, privacy-controlled dubbing pipelines in English or Mandarin; choose ElevenLabs for multilingual, cloud-based content production with zero infrastructure setup.
Choose IndexTTS 2.0 if:
- You control your own GPU infrastructure (8GB VRAM minimum) and want zero recurring subscription cost.
- You need frame-accurate duration matching for video dubbing or lip-sync work.
- Your content targets English or Mandarin Chinese primarily.
- You require full data privacy with no audio leaving your own servers.
- You accept the requirement to register with Bilibili before commercial deployment of the model weights.
Choose ElevenLabs if:
- You need production-ready voice generation across 70+ languages without managing infrastructure.
- You want access to a 100,000-voice community library instead of sourcing your own reference audio.
- You need a hosted REST API with SDKs for rapid integration into an existing app.
- You plan to deploy conversational voice agents through ElevenAgents.
- You prefer predictable monthly billing over GPU procurement and maintenance.
Who Should Use IndexTTS 2.0 vs ElevenLabs?
Indie developers, ML researchers, and studios with existing GPU infrastructure fit IndexTTS 2.0; content creators, podcasters, and enterprise teams without in-house ML operations fit ElevenLabs.
Solo developers building a self-hosted dubbing tool for English or Mandarin video content get commercial-grade output from IndexTTS 2.0 without a monthly bill, provided they complete Bilibili’s commercial-use registration first. Enterprise teams running Fortune 500-scale content operations in 30+ languages get faster deployment from ElevenLabs’ Scale and Business tiers, which add multi-seat workspaces and lower per-minute overage rates. Podcasters and YouTubers producing daily content in English typically start on ElevenLabs’ Creator plan at $22/month for Professional Voice Cloning and 121,000 monthly credits, since IndexTTS 2.0 demands GPU setup and model-serving knowledge that non-technical creators rarely have.
What Are the Best Alternatives to IndexTTS 2.0 and ElevenLabs?
- PlayHT — a cloud TTS platform with ultra-low-latency streaming voices aimed at real-time voice agent developers.
- CosyVoice2 — an open-source, self-hosted zero-shot TTS model from Alibaba, positioned as IndexTTS 2.0’s closest open-source competitor.
- Fish Audio — a cloud voice generation platform marketed as a lower-cost alternative to ElevenLabs with comparable Multilingual output quality.
Frequently Asked Questions
Is IndexTTS 2.0 completely free?
The code is Apache 2.0 licensed and free to run. Commercial use of the trained model weights requires prior written registration with Bilibili under the project’s separate model license.
Does ElevenLabs offer a free plan?
Yes. ElevenLabs’ Free plan includes 10,000 credits per month (roughly 10 minutes of audio) but excludes commercial usage rights, which begin on the $6/month Starter plan.
Can IndexTTS 2.0 run without a GPU?
IndexTTS 2.0 runs on CPU, but Bilibili’s documentation recommends a CUDA-compatible GPU with at least 8GB VRAM for practical inference speed.
Which tool supports more languages?
ElevenLabs supports 70+ languages. IndexTTS 2.0 officially supports English and Mandarin Chinese, with multilingual generalization possible through additional fine-tuning.
IndexTTS 2.0 delivers zero-cost, self-hosted voice cloning with frame-accurate dubbing control for English and Mandarin projects, while ElevenLabs delivers a $6-to-$990-per-month managed platform covering 70+ languages with no infrastructure to maintain — the deciding factor is whether GPU ownership or monthly billing fits the project’s operating model.
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