Open Text-to-Speech and Voice Models

Chatterbox is an MIT-licensed text-to-speech model family for developers and creators who want to generate speech on their own hardware. You can self-host it on a GPU, including in an air-gapped environment, without an account or API key. Resemble AI also offers separate managed hosting.

IndexTTS, currently IndexTTS-2.5, is a local text-to-speech system that can reproduce a speaker's voice using one reference recording. It's for people creating spoken audio and developers building speech generation into their own applications. Voice identity and emotion have separate controls, so an emotional reference can shape the delivery while a different recording supplies the voice.

Fish Speech, currently featuring Fish Audio S2 Pro, is a self-hosted text-to-speech system for creators producing narration and developers building voice applications. It combines voice cloning with control over emotion and delivery within a script. Code and model weights use the custom FISH AUDIO RESEARCH LICENSE.

VibeVoice is a family of MIT-licensed, open-source voice AI models for developers and researchers building local transcription or speech generation tools. Its speech recognition models combine transcript text with speaker labels and timestamps, so recordings retain information about who spoke and when.

AudioLDM 2 generates sound effects, music and speech on your own hardware. It's a Python tool for people experimenting with synthetic audio, including sound designers and researchers who want to work with pretrained models. A Gradio browser interface and command-line tools provide access to local generation; a hosted Hugging Face demo is also available.

Higgs Audio is a family of text-to-speech models from Boson AI for developers building narration and conversational audio. Higgs TTS 2 can adapt pacing and intonation to the text and generate dialogue with distinct speakers across multiple languages.

WhisperSpeech is a local text-to-speech system that uses OpenAI Whisper as the basis for generating speech. It's for developers and speech researchers who want to work with downloadable models on their own hardware. It supports voice cloning.

Zonos is an open-source text-to-speech model for people who want to generate speech and clone voices on their own hardware. It can match a speaker from a short reference recording, with controls for delivery and emotion. The code uses the Apache 2.0 license.

StyleTTS 2 is an open-source text-to-speech model for developers and speech researchers who want to generate expressive speech on their own hardware. It can choose a speaking style from the text without a reference recording, while its multispeaker model uses reference audio to reproduce a speaker's voice and delivery. The Python code uses PyTorch and carries the MIT license.

Sesame CSM is an open-source speech generation model for developers and researchers building voice applications on their own hardware. It uses text and audio inputs to generate speech, with support for conversational context and different speakers. It's a model component for applications that need spoken output.

XTTS v2 generates speech from text using a reference voice recording or a preset speaker. It runs locally through Coqui TTS and suits developers building speech into apps, as well as researchers who want to fine-tune a speech model on their own hardware.

CosyVoice is a local text-to-speech system for developers and researchers who want to generate speech in a reference speaker's voice, including in another language. Its zero-shot voice cloning doesn't require training a separate model for each speaker. You can run it on your own hardware or deploy it as a self-hosted service.

Parler-TTS generates speech locally, with text descriptions that control how the voice sounds. It's a Python library for developers building speech into applications and researchers who want to train or adapt a TTS model. The library uses the Apache 2.0 license and can run on CPU or CUDA GPUs, with support for Apple Silicon.

Spark-TTS is a local text-to-speech system that can copy a voice from reference audio or create a synthetic speaker with adjustable vocal traits. It's for developers and researchers building speech applications, including personalized narration, assistive technology, and language research. The Python and PyTorch code is open source under Apache 2.0.

Tortoise TTS is a local text-to-speech system for developers and creators who want speech with varied voices and natural pacing. It uses reference audio clips to guide a custom voice, with an emphasis on expressive rhythm and intonation.

Orpheus TTS is an open-source text-to-speech system for developers building voice applications or adapting speech models to their own recordings. It runs locally and uses a Llama backbone to generate speech with control over emotion and intonation. The code uses the Apache 2.0 license.

Bark is Suno's local text-to-audio model for developers and researchers who want to generate speech alongside other sounds. It can produce laughter, crying, music and background noise within its output. Its generative approach suits audio experiments, though it can depart from the supplied script and doesn't guarantee clean, studio-quality speech.

Dia is the original text-to-speech model from Nari Labs that generates a two-speaker conversation from a written script in one pass. It's for researchers and developers who want to generate English dialogue on their own hardware, with control over speaker voices and delivery. The code and model weights are available under Apache 2.0. Dia2 is a separately linked successor.

F5-TTS is a local text-to-speech system that uses a reference recording to generate new speech in that voice without training a separate model for each speaker. It's for developers, speech researchers, and creators who want to generate voices on their own hardware. Its Python code uses MIT, while pretrained models use the noncommercial CC-BY-NC license.

OpenVoice is an open-source voice cloning tool that uses a short recording to reproduce a speaker's voice in generated speech. It's for developers and creators who need a recognizable voice across languages, with control over how that voice sounds. The Python project is MIT licensed for commercial use.

Kokoro is a text-to-speech model and inference library for developers who want to generate speech on their own hardware or servers. Its compact Kokoro-82M model suits personal projects and production applications, with Apache 2.0 licensing for both the library and model weights.