Clone Any Voice in 3 Seconds
The world's first super-realistic on-device TTS with instant voice cloning. Run it on your laptop, phone, or even Raspberry Pi 4—no GPU required, no cloud needed. Your voice data stays 100% private on your device.
Experience instant voice cloning right in your browser
Note: The demo is hosted on Hugging Face Spaces. If it's sleeping, it may take 10-20 seconds to wake up. All processing happens on the server—once downloaded, NeuTTS Air runs entirely on your device.
Compare NeuTTS Air with traditional cloud-based TTS services
Traditional Services
On-Device Privacy
Local but Heavy
The technology behind instant voice cloning
Built on a 0.5B LLM backbone optimized for text understanding and phoneme generation. The complete model architecture totals 748M parameters, delivering exceptional quality with minimal compute.
Neural audio codec achieving exceptional quality at low bitrates using a single codebook. Compresses audio efficiently while preserving voice characteristics.
Capture voice characteristics from just 3 seconds of audio. The model extracts prosody, intonation, and acoustic properties to create a unique voice profile instantly.
Every generated audio includes perceptual threshold watermarking for content authentication and responsible AI use. Imperceptible to humans but detectable for verification.
Unlike traditional text-to-speech solutions, NeuTTS Air represents a paradigm shift in voice synthesis technology. Developed by Neuphonic, NeuTTS Air combines cutting-edge AI with privacy-first design principles.
NeuTTS Air achieves what was previously thought impossible: accurate voice cloning from minimal audio samples. Traditional voice cloning systems require hours of training data and expensive computational resources. NeuTTS Airbreaks this barrier by extracting essential voice characteristics from just 3 seconds of audio, making personalized voice synthesis accessible to everyone.
The secret lies in NeuTTS Air's advanced neural architecture, which efficiently captures prosody, timbre, speaking rate, and emotional tone. Whether you need to preserve a family member's voice, create consistent brand narration, or build interactive voice applications, NeuTTS Air delivers professional results without the traditional complexity.
In an era where data privacy concerns are paramount, NeuTTS Air takes a fundamentally different approach. Every voice sample, every generated audio file, and every processing step happens entirely on your device. Your sensitive voice data never touches external servers, never crosses network boundaries, and never becomes part of someone else's training dataset.
This zero-trust architecture makes NeuTTS Air ideal for organizations handling sensitive information—healthcare providers reading patient records, legal firms processing confidential documents, or enterprises protecting trade secrets. With NeuTTS Air, privacy isn't an afterthought; it's baked into the core design, ensuring compliance with GDPR, HIPAA, and other data protection regulations.
While most modern TTS systems demand powerful GPUs and cloud infrastructure, NeuTTS Air runs efficiently on standard CPUs. This CPU optimization opens up entirely new deployment scenarios—embedded systems, mobile applications, edge devices, and resource-constrained environments where GPU access isn't feasible.
The GGML quantization format employed by NeuTTS Air reduces model size without sacrificing quality, enabling real-time inference on devices from Raspberry Pi 4 to smartphones. Whether you're building IoT voice interfaces, offline assistive tools, or autonomous systems that can't rely on connectivity, NeuTTS Air provides production-ready performance without infrastructure overhead.
Released under the permissive Apache 2.0 license, NeuTTS Air gives developers complete freedom to innovate, modify, and deploy without licensing fees or usage restrictions. Unlike proprietary TTS APIs that charge per character or impose rate limits, NeuTTS Air offers unlimited generation at zero marginal cost.
The open-source nature of NeuTTS Air fosters transparency, community collaboration, and continuous improvement. Developers can examine the code, understand the algorithms, and contribute enhancements. This openness builds trust—especially critical for applications where voice synthesis quality and reliability directly impact user experience.
Deploy NeuTTS Air where data privacy and offline capability matter most
HIPAA-compliant patient communication, medical device interfaces, and assistive reading tools that keep sensitive data on-device.
Document reading and transcription services for law firms where client confidentiality is paramount and data cannot leave the premises.
Internal training materials, confidential presentations, and corporate communications without exposing sensitive content to cloud providers.
Student privacy-safe learning apps, offline language learning tools, and accessible educational content for schools with strict data policies.
Privacy-first voice assistants, home automation systems, and IoT devices that function completely offline without cloud dependencies.
In-vehicle navigation, entertainment systems, and driver assistance that work without cellular connectivity or data sharing.
NeuTTS Air achieves an unprecedented balance between computational efficiency and audio fidelity, proving that on-device TTS doesn't mean compromising on quality.
NeuTTS Air processes text and generates high-quality audio at speeds that enable truly interactive applications. Real-time generation means your users don't wait—whether they're listening to educational content, navigating with voice guidance, or interacting with voice assistants. The optimized inference pipeline in NeuTTS Air minimizes latency to imperceptible levels, creating seamless user experiences that feel natural and responsive.
Unlike cloud-based solutions where network latency adds unpredictable delays, NeuTTS Air delivers consistent performance regardless of internet connectivity. This reliability makes NeuTTS Air ideal for time-sensitive applications like live captioning, interactive storytelling, and real-time translation services.
The audio output from NeuTTS Air rivals professional voice acting studios. At 24kHz sampling rate with NeuCodec compression, NeuTTS Air preserves subtle voice characteristics that make speech sound genuinely human—not robotic or artificial. The model captures breath patterns, micro-pauses, tonal variations, and emotional inflections that bring synthesized speech to life.
The audio quality approaches human-like naturalness, especially for neutral narration and informational content. This quality level enables NeuTTS Air to power professional use cases—audiobook production, commercial voiceovers, accessibility services, and customer-facing applications where voice quality directly impacts brand perception.
NeuTTS Air has been battle-tested in production environments, proving its reliability across diverse deployment scenarios. The model handles edge cases gracefully—unusual pronunciations, multilingual text, technical terminology, and formatting variations—without crashing or producing garbled output. Comprehensive error handling ensures NeuTTS Air degrades gracefully under resource constraints.
Integration support makes deploying NeuTTS Air straightforward. The Python API provides intuitive interfaces for common tasks, while the GGUF format ensures compatibility with standard inference engines. Whether you're building web applications, mobile apps, embedded systems, or desktop software, NeuTTS Air integrates smoothly into your existing technology stack without requiring specialized infrastructure.
Follow these three simple steps to clone your first voice with NeuTTS Air
Clone the repository and install required packages. Make sure you have Python 3.11+ installed.
git clone https://github.com/neuphonic/neutts-air.git
cd neutts-air
pip install -r requirements.txtRecord or select a 3-15 second audio clip in WAV format. Requirements:
Use the Python API to clone the voice and generate speech:
from neuttsair.neutts import NeuTTSAir
import soundfile as sf
tts = NeuTTSAir(
backbone_repo="neuphonic/neutts-air",
backbone_device="cpu"
)
ref_codes = tts.encode_reference("voice.wav")
wav = tts.infer("Hello world!", ref_codes, ref_text)
sf.write("output.wav", wav, 24000)Need more help? Check out the comprehensive documentation:
NeuTTS Air is backed by an active open-source community and comprehensive ecosystem of tools, integrations, and resources to accelerate your development.
The NeuTTS Air repository receives regular updates from Neuphonic's core team and community contributors. Bug fixes, performance improvements, and new features are continuously added based on user feedback and emerging use cases.
With transparent development on GitHub, you can track progress, report issues, submit pull requests, and participate in shaping the future of NeuTTS Air. The maintainers actively engage with the community, ensuring NeuTTS Air evolves to meet real-world needs.
Join thousands of developers using NeuTTS Air worldwide. The community provides support through GitHub Discussions, Discord channels, and Stack Overflow. Whether you're debugging integration issues, optimizing performance, or exploring advanced features, experienced users and maintainers are ready to help.
Community contributions extend beyond code—tutorials, example projects, integration guides, and benchmark reports help new users get started quickly with NeuTTS Air and unlock its full potential.
NeuTTS Air integrates seamlessly with popular frameworks and platforms. Use it with LangChain for AI agents, integrate into Electron apps for desktop voice interfaces, or embed NeuTTS Air into React Native apps for mobile deployment.
Common questions about NeuTTS Air capabilities and deployment
NeuTTS Air offers distinct advantages over cloud services. First, all processing happens locally, ensuring complete data privacy—your text and audio never leave your device. Second, there are no usage fees or rate limits; generate unlimited audio at zero cost. Third, NeuTTS Air works entirely offline, making it suitable for applications requiring guaranteed availability regardless of internet connectivity.
While cloud services may offer more voices or languages initially, NeuTTS Air's 3-second voice cloning capability lets you create any voice you need instantly, offering flexibility that pre-recorded voice banks cannot match.
NeuTTS Air is designed for CPU-only operation and runs efficiently on consumer hardware. Recommended requirements include a modern CPU (Intel i5/AMD Ryzen 5 or better), 4GB RAM, and about 2GB storage for models. NeuTTS Airachieves real-time generation on laptops, desktops, and even single-board computers like Raspberry Pi 4 or higher.
No GPU required, no specialized hardware needed. If your device can run Python 3.11+, it can likely run NeuTTS Air. Performance scales with CPU capabilities—faster processors generate audio more quickly, but even modest hardware delivers acceptable latency.
Yes, absolutely. NeuTTS Air is released under the Apache 2.0 license, which permits commercial use without royalties or usage fees. You can integrate NeuTTS Air into commercial products, SaaS platforms, mobile apps, or any revenue-generating application without restriction.
The only requirement is attribution and license compliance—retain copyright notices and include a copy of the Apache 2.0 license with your distribution. Beyond that, NeuTTS Air imposes no limitations on commercial deployment or monetization.
NeuTTS Air extracts remarkable voice characteristics from minimal audio. Three seconds provides enough data to capture fundamental pitch, speaking rate, and timbre. For optimal results, use 5-15 seconds of clear, natural speech. The model captures not just vocal tone but also prosodic patterns—how the speaker emphasizes words and structures sentences.
Quality depends on reference audio characteristics. Clean recordings with minimal background noise yield better results than noisy samples. While NeuTTS Air won't perfectly replicate every nuance from 3 seconds, the output convincingly resembles the source voice for most applications, especially neutral narration and informational content.
Currently, NeuTTS Air primarily supports English text input, though the voice cloning mechanism works with any language in the reference audio. The Qwen 0.5B backbone has been optimized for English phoneme prediction, ensuring highest quality for English synthesis.
The architecture of NeuTTS Air is inherently extensible. The community and Neuphonic team are actively working on multilingual support. Thanks to the open-source nature of NeuTTS Air, language support will expand as contributors train and release models for additional languages. Check the GitHub repository for the latest language availability.
Perth watermarking is an audio authentication technique that embeds imperceptible markers into generated speech. Every audio file created by NeuTTS Air contains these markers, making it possible to verify whether audio was synthesized by the system. This addresses growing concerns about deepfakes and synthetic media misuse.
The watermark operates below human perceptual thresholds—listeners cannot detect it, and it doesn't degrade audio quality. However, specialized detection tools can identify NeuTTS Air-generated audio reliably. This responsible AI approach helps combat misinformation while enabling legitimate creative and assistive applications of voice synthesis technology.
Join developers, researchers, and companies who trust NeuTTS Air for privacy-critical voice applications. Open-source, free forever, and runs entirely on your device.
Apache 2.0 Licensed • Made by Neuphonic • Built on Qwen 0.5B