Open-source TTS list sorts models by license before quality for commercial shipping

mahimairaja · reddit · 2026-07-21

A Reddit post shares a curated open-source TTS reference list organized by license first and quality second, arguing that commercial shippability matters more than small quality differences.

The list highlights models that are actually MIT/Apache-licensed and deployable, including Chatterbox Multilingual v3, Kokoro 82M, Orpheus-TTS, Sesame CSM-1B, CosyVoice 2, MeloTTS, Kitten TTS, StyleTTS 2, Parler-TTS and Zonos2.

It also warns that several commonly recommended open-weight models are restricted by non-commercial or usage-capped licenses, such as F5-TTS, Coqui XTTS v2, MaskGCT, IndexTTS-2, Higgs Audio v2 and Fish Speech / OpenAudio S1-mini.

The repo is MIT licensed and includes sections on streaming taxonomy, cancellation, codecs, watermarking and evaluation methodology.

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