Chatterbox TTS
Chatterbox TTS is a family of open-source text-to-speech models from Resemble AI, available free under the MIT license for research and development.
What Chatterbox TTS is
Chatterbox TTS is a family of open-source text-to-speech models from Resemble AI, available free under the MIT license for research and development. The project lists Turbo, Nano, Multilingual V3, and dedicated single-language models. Turbo supports tags such as [sigh], [gasp], [cough], and [laugh] to prompt vocal reactions; Nano is intended for on-device or CPU inference where memory and latency budgets are tight. The README lists 23 languages for Multilingual and provides pip and source installation instructions. It describes development with Python 3.11 on Debian 11 and device options including CUDA, CPU, and MPS. Chatterbox supports voice cloning, batch processing, audio input, voice isolation, and WAV export. Generated audio files include Resemble AI's PerTh watermark. Resemble says it no longer offers voice generation as a commercial product, while the models remain open and free for research and development. The listed platforms are Linux, macOS, and self-hosted. The project invites users to join its Discord community.
Good
- Open-source models are free under the MIT license.
- Includes Turbo, Nano, and Multilingual V3 models.
- Multilingual lists 23 supported languages.
- Supports WAV export and voice cloning.
Watch out
- Generated audio includes a PerTh watermark.
- Resemble no longer offers voice generation commercially.
- Listed platforms are Linux, macOS, and self-hosted.
Who it suits
Chatterbox may suit developers and researchers seeking open-source text-to-speech models. Turbo is described for low-latency voice agents, while Nano targets on-device or CPU inference under tight resource budgets.
Verdict
Chatterbox provides several open-source model options and installation paths for research and development. Users should account for the PerTh watermark and its stated non-commercial product availability.
Plans and prices
From Chatterbox TTS's own pricing page, checked 8 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Chatterbox open-source models | Free | Open-source models for research and development · Free to use under the MIT license |
| Voice AI Research (Chatterbox) | Free | Open models · free to build on · no commercial hosted voice service |
The facts
Each one read from Chatterbox TTS's own pages, with the date it was checked.
What it does
- Commercial use
- Yeschecked 20 Sep 2026
- Controls
- The Python interface exposes generation controls including exaggeration, CFG weight, temperature and random seed.checked 21 Oct 2026
- Current availability
- Resemble says it has stopped offering voice generation as a commercial product and that its voice models remain open and free for research and development.checked 8 Oct 2026
- Documentation depth
- The repository includes model selection tables, Python examples, language identifiers, watermark extraction code, tuning guidance and evaluation links.checked 21 Oct 2026
- Export formats
- WAVchecked 20 Sep 2026
- Expressive speech
- Turbo supports paralinguistic tags such as [sigh], [gasp], [cough], and [laugh] to prompt vocal reactions.checked 8 Oct 2026
- Hallucination reduction
- The V3 description says it reduces unwanted continuation, repetition and off-prompt speech compared with earlier multilingual versions.checked 21 Oct 2026
- Installation
- The project can be installed with pip as chatterbox-tts or from a cloned repository in editable mode.checked 21 Oct 2026
- Integration
- NVIDIA provides a Chatterbox TTS plugin for ACE for Games with CUDA, Vulkan and Windows D3D12 backends.checked 21 Oct 2026
- Intended users
- The README describes Turbo for low-latency voice agents and Nano for on-device or CPU inference when memory and latency budgets are tight.checked 8 Oct 2026
- Languages
- The README lists 23 supported languages for Chatterbox Multilingual.checked 8 Oct 2026
- Latest model
- The repository identifies Chatterbox Multilingual V3 as its newest general-purpose multilingual model.checked 21 Oct 2026
- License
- The code and model listing identify the project as MIT licensed, permitting modification and redistribution subject to the license notice.checked 21 Oct 2026
- Limit: commercial availability
- Resemble’s current product notice says voice generation is no longer offered as a commercial product, although the models remain open and free for research and development.checked 21 Oct 2026
- Limit: comparative performance evidence
- An independent review reports that Resemble’s blind test favored Chatterbox, but an Artificial Analysis snapshot ranked Chatterbox below ElevenLabs’ leading model.checked 21 Oct 2026
- Limit: watermark removability
- An independent review notes that MIT licensing allows modified software, so users can technically remove the watermark by changing the code.checked 21 Oct 2026
- Memory requirement
- NVIDIA documents approximately 2.3 GB VRAM for Turbo-only inference and 3.5 GB for multilingual TTS-only inference in its plugin.checked 21 Oct 2026
The company
- Company founding
- Resemble says Zohaib Ahmed and Saqib Muhammad started the company in 2019.checked 21 Oct 2026
- Company headquarters
- LinkedIn lists Resemble AI headquarters in Santa Clara, California, with 11–50 employees.checked 21 Oct 2026
- Company ownership and funding
- Crunchbase describes Resemble AI as a private, for-profit company with five funding rounds and founders Zohaib Ahmed and Saqib Muhammad, while funding amounts are obscured.checked 21 Oct 2026
- Founded
- 2019checked 28 Sep 2026
- Maker legal name
- Resemble AI, Inc. is the company name shown in the maker’s privacy-policy contact information.checked 21 Oct 2026
Money
- Free plan
- Yeschecked 20 Sep 2026
- Limit: service reliability and billing
- Trustpilot complaints repeatedly mention failed or cut-off audio, slow or absent support, unexpected charges, credit problems and service outages; these reviews concern Resemble’s former hosted service rather than the self-hosted model.checked 21 Oct 2026
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