Kitten TTS

New: Kitten TTS v0.8 is out -- 15M, 40M, and 80M parameter models now available.

Kitten TTS is an open-source, lightweight text-to-speech library built on ONNX. With models ranging from 15M to 80M parameters (25-80 MB on disk), it delivers high-quality voice synthesis on CPU without requiring a GPU.

Status: Developer preview -- APIs may change between releases.

Commercial support is available. For integration assistance, custom voices, or enterprise licensing, contact us.

Features
Available Models
Demo
Quick Start
API Reference
System Requirements
Roadmap
Commercial Support
Community and Support
License

Features

Ultra-lightweight -- Model sizes from 25 MB (int8) to 80 MB, suitable for edge deployment
CPU-optimized -- ONNX-based inference runs efficiently without a GPU
8 built-in voices -- Bella, Jasper, Luna, Bruno, Rosie, Hugo, Kiki, and Leo
Adjustable speech speed -- Control playback rate via the speed parameter
Text preprocessing -- Built-in pipeline handles numbers, currencies, units, and more
24 kHz output -- High-quality audio at a standard sample rate

Available Models

| Model | Parameters | Size | Download | |---|---|---|---| | kitten-tts-mini | 80M | 80 MB | KittenML/kitten-tts-mini-0.8 | | kitten-tts-micro | 40M | 41 MB | KittenML/kitten-tts-micro-0.8 | | kitten-tts-nano | 15M | 56 MB | KittenML/kitten-tts-nano-0.8 | | kitten-tts-nano (int8) | 15M | 25 MB | KittenML/kitten-tts-nano-0.8-int8 |

Note: Some users have reported issues with the kitten-tts-nano-0.8-int8 model. If you encounter problems, please open an issue.

Demo

https://github.com/user-attachments/assets/d80120f2-c751-407e-a166-068dd1dd9e8d

Try it online

Try Kitten TTS directly in your browser on Hugging Face Spaces.

Quick Start

Prerequisites

Python 3.8 or later
pip

Installation

pip install https://github.com/KittenML/KittenTTS/releases/download/0.8.1/kittentts-0.8.1-py3-none-any.whl

Basic Usage

from kittentts import KittenTTS

model = KittenTTS("KittenML/kitten-tts-mini-0.8")
audio = model.generate("This high-quality TTS model runs without a GPU.", voice="Jasper")

import soundfile as sf
sf.write("output.wav", audio, 24000)

Advanced Usage

# Adjust speech speed (default: 1.0)
audio = model.generate("Hello, world.", voice="Luna", speed=1.2)

# Save directly to a file
model.generate_to_file("Hello, world.", "output.wav", voice="Bruno", speed=0.9)

# List available voices
print(model.available_voices)
# ['Bella', 'Jasper', 'Luna', 'Bruno', 'Rosie', 'Hugo', 'Kiki', 'Leo']

API Reference

`KittenTTS(model_name, cache_dir=None)`

Load a model from Hugging Face Hub.

| Parameter | Type | Default | Description | |---|---|---|---| | model_name | str | "KittenML/kitten-tts-nano-0.8" | Hugging Face repository ID | | cache_dir | str | None | Local directory for caching downloaded model files |

`model.generate(text, voice, speed, clean_text)`

Synthesize speech from text, returning a NumPy array of audio samples at 24 kHz.

| Parameter | Type | Default | Description | |---|---|---|---| | text | str | -- | Input text to synthesize | | voice | str | "expr-voice-5-m" | Voice name (see available voices) | | speed | float | 1.0 | Speech speed multiplier | | clean_text | bool | False | Preprocess text (expand numbers, currencies, etc.) |

`model.generate_to_file(text, output_path, voice, speed, sample_rate, clean_text)`

Synthesize speech and write directly to an audio file.

| Parameter | Type | Default | Description | |---|---|---|---| | text | str | -- | Input text to synthesize | | output_path | str | -- | Path to save the audio file | | voice | str | "expr-voice-5-m" | Voice name | | speed | float | 1.0 | Speech speed multiplier | | sample_rate | int | 24000 | Audio sample rate in Hz | | clean_text | bool | True | Preprocess text (expand numbers, currencies, etc.) |

`model.available_voices`

Returns a list of available voice names: ['Bella', 'Jasper', 'Luna', 'Bruno', 'Rosie', 'Hugo', 'Kiki', 'Leo']

System Requirements

Operating system: Linux, macOS, or Windows
Python: 3.8 or later
Hardware: Runs on CPU; no GPU required
Disk space: 25-80 MB depending on model variant

A virtual environment (conda, venv, or similar) is recommended to avoid dependency conflicts.

Roadmap

[ ] Release optimized inference engine
[ ] Release mobile SDK
[ ] Release higher quality TTS models
[ ] Release multilingual TTS
[ ] Release KittenASR
[ ] Need anything else? Let us know

Commercial Support

We offer commercial support for teams integrating Kitten TTS into their products. This includes integration assistance, custom voice development, and enterprise licensing.

Community and Support

Discord: Join the community
Website: kittenml.com
Custom support: Request form
Email: info@stellonlabs.com
Issues: GitHub Issues

License

This project is licensed under the Apache License 2.0.

KittenTTS

Install / Use

README