Whats the best open source/free TTS

Reddit r/LocalLLaMA / 4/7/2026

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Key Points

A Reddit user asks which open-source or free text-to-speech (TTS) system produces the most natural, non-robotic speech for training ASR models.
They specifically want multi-accent capability, asking whether TTS can mimic English accents such as American and British, as well as French.
The post frames TTS selection as a practical enabler for generating synthetic audio data to improve automatic speech recognition training.
The request implicitly prioritizes controllability (accent/style), naturalness, and accessibility (open-source/free options).

Hey, Im trying to see how much does synthetic data help with training ASR model. What is the best TTS? Im looking for something that sounds natural and not robotic. It would be really nice if the TTS could mimic english accents (american, british, french etc.). Thanks for the help.

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