Chatterbox

Chatterbox is Resemble AI’s open-source text-to-speech model with voice cloning and emotion control, delivering production-quality speech you can run yourself.

Overview

Chatterbox brought competitive TTS quality to the open-source world, with zero-shot voice cloning from short reference audio and unique intensity controls for emotion. It generates natural, expressive speech and runs locally, giving developers freedom from per-character pricing.

The model supports multiple languages, watermarking for responsible use, and streaming generation for real-time applications. Resemble’s backing means steady development, and the community has built interfaces, extensions and fine-tunes that extend Chatterbox into many production scenarios. Emotion intensity controls give expressive range that most open models lack, making performances feel genuinely acted. Watermarking addresses misuse concerns that often accompany open voice cloning technology.

Key Features

• Open-source TTS with zero-shot voice cloning
• Emotion and intensity controls for expressive speech
• Multilingual generation with natural prosody
• Watermarking for responsible AI use
• Streaming support for real-time applications
• Runs locally on consumer GPUs
• Active community and commercial support from Resemble

Pricing

Chatterbox is free and open source under its license, with costs limited to compute. Resemble AI offers commercial hosting and enterprise support for teams that prefer managed infrastructure. The model is free, and even modest GPUs handle production workloads, making per-character commercial TTS costs avoidable.

Who Is It For

Chatterbox is for developers and researchers who want voice cloning and expressive TTS without vendor lock-in, and for products where running speech models locally matters for cost or privacy. It also suits researchers studying voice synthesis who need a strong, inspectable baseline model.

FAQ

Is Chatterbox free to use?

Yes, Chatterbox is completely free and open source. Optional paid services come from Resemble AI for hosting, support and additional commercial capabilities.

Does Chatterbox offer an API?

Chatterbox is a model you run yourself, and the community commonly wraps it in local APIs. Resemble AI’s platform provides hosted APIs for teams that want managed service.

How does Chatterbox compare to alternatives?

Chatterbox offers openness and control where commercial TTS platforms offer convenience and maximum polish. For local, cost-controlled voice features it is one of the best open options available. Chatterbox is the best open voice option for control and cost; managed platforms remain ahead on raw polish and convenience. Expect to handle deployment and optimization yourself, which is a real cost in engineering time, offset by the absence of per-character fees and total control over the voice stack.