From the source
Developers building voice agents ask us for voices matched to the use case in front of them: a Québécoise receptionist for a Montréal dealership, a Paulista support agent for a São Paulo fintech, a narrator in his sixties with the authority of a lecture hall.
Briefs outnumber any catalog.
Voice cloning inherits several constraints: each voice costs a speaker to source, consent to obtain and a licence to sign.
It is not scalable.
Voice Design starts from a prompt.
Write one or two sentences and complete new voices are created in a few seconds.
Keep the one you want and use it with the same Text-to-Speech endpoint as any catalog voice.
Voice Design is live today in the API and the Studio.
It outperforms all the public APIs for voice design that we could test.
Native speakers picked Gradium voices over ElevenLabs, Inworld, MiniMax and Fish Audio in 72.6% of blind pairwise comparisons on accent prompts, 13.6 points clear of the next system and first in every language tested.
Win rate against the field on accent prompts.
Blind pairwise human ratings, 7,627 comparisons, September 2026. 50% is par.
Hear it first Four voices, each generated from a single written description.
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