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Open weight, with conditionsOpen voice and text-to-speech

NeuTTS Air

neuphonic

On-device TTS with instant voice cloning - ~360M active params, GGUF builds for phones, laptops and Raspberry Pi.

6.0k stars(as of 2026-06-14)View on GitHubHomepage
Overview

What is NeuTTS Air?

NeuTTS is a collection of on-device TTS models by Neuphonic on small LLM backbones with a 50Hz neural codec. NeuTTS-Air (~360M active params, Apache-2.0) does English with instant cloning from 3 seconds of audio; GGUF quantizations run on phones, laptops and single-board computers. Nano adds Spanish/German/French under a more restrictive license.

Analysis

Pros & Cons

Pros

  • GGUF-first design deploys out of the box on Raspberry Pi and Android
  • NeuTTS-Air weights are Apache-2.0 - genuinely open for commercial use
  • Instant voice cloning from 3 seconds at on-device scale is rare in this weight class

Cons

  • Multilingual Nano weights carry a license needing paid commercial use above a revenue threshold
  • Apache-licensed Air model is English-only; multilingual needs the restricted Nano
  • Small startup; impersonator sites have appeared - verify the source
License

License

Apache-2.0 (Air weights) (Open weight, with conditions) - model license: NeuTTS Open License v1.0 (Nano)

NeuTTS-Air weights are Apache-2.0; the multilingual NeuTTS-Nano weights use the NeuTTS Open License v1.0 (free for research/limited commercial, paid above a revenue threshold). Verify via neuphonic.com and this GitHub only - impersonator sites exist.

When it is interesting

You need genuinely edge-deployable TTS with cloning for embedded, mobile or compliance-sensitive uses where sending audio to an API is not acceptable.

When it is too early

You need multilingual support under a fully open license or independently verified quality benchmarks.

Context

Commercial alternative & related

This repo featured in the 2026-07 edition of the Open-Source AI Radar.

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