Voice sources and licenses

Checked September 26, 2026. Kesru names are display names for the stock voices below. Listening plays saved synthetic clips. A sample does not mean that its engine is enabled for your account.

Ava and Noah · Supertonic 3

Supertone's Supertonic 3 model and its supplied F2 and M3 voice styles. Commercial hosting is permitted subject to the BigScience Open RAIL-M license, including its use restrictions. These restrictions apply when using these voices through Kesru. Voice-use terms · Full license copy and Attachment A · Original model and voice styles. Kesru has not modified the model or voice-style files.

Jane · Pocket TTS and VCTK

Pocket TTS by Kyutai, English model, licensed under Creative Commons Attribution 4.0 International. Jane uses the stock VCTK speaker p339 prompt, p339_023_enhanced.wav, published by Kyutai. The source is the CSTR VCTK Corpus 0.92 by Junichi Yamagishi, Christophe Veaux and Kirsten MacDonald, University of Edinburgh, under CC BY 4.0. Kyutai supplies an enhanced recording cleaned with ai-coustics. Kesru uses it as a synthesis prompt and converts generated output for playback; it has not modified the model weights. Model · Voice source and license information. This attribution covers Jane's VCTK prompt, not all voices in Kyutai's repository.

Sophie · Soprano 1.1

The default stock voice of ekwek's Soprano-1.1-80M, provided under Apache License 2.0. No customer voice cloning or model modification.

Jake · Kokoro 1.0

The stock am_fenrir voice of hexgrad's Kokoro-82M v1.0, provided under Apache License 2.0. Kesru runs the existing ONNX conversion with its supplied voice pack. No customer voice cloning.

Gemini voices

Gemini speech is generated through Google's existing paid API project under its Gemini API terms. The catalog includes Google's studio voices and public prebuilt Voice Library metadata. It does not include private or replicated voices.

Model licenses do not imply an endorsement of Kesru by the authors. Server and telephone costs still apply to locally hosted voices.