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Waterr’s realtime voice engine — including ORI-Realtime 1.5 — uses open speech models and reference audio from publicly-released datasets. This page provides the attributions required by their respective licenses.

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Speech foundations

ORI-Realtime 1.5 builds on open speech models released by Kyutai:
  • Kyutai streaming TTS (kyutai.org/tts) — text-to-speech model weights, CC BY 4.0.
  • Kyutai streaming STT — speech-to-text model weights, CC BY 4.0.
  • Unmute serving components — open-source code released by Kyutai under permissive licenses (MIT/Apache-2.0).
The semantic turn engine configuration, reasoning orchestration, serving infrastructure, and the ORI-Realtime API are built by Waterr.

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Reference voices

Waterr’s voice presets use reference audio from the following datasets. The id column matches the voice_id returned by GET /voices.

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CSTR VCTK Corpus

The voices below are derived from the CSTR VCTK Corpus (Centre for Speech Technology Research, University of Edinburgh), released under the CC BY 4.0 license. Citation: Yamagishi, Junichi; Veaux, Christophe; MacDonald, Kirsten. (2019). CSTR VCTK Corpus: English Multi-speaker Corpus for CSTR Voice Cloning Toolkit (version 0.92). University of Edinburgh. The Centre for Speech Technology Research (CSTR). https://doi.org/10.7488/ds/2645

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License summary

If you build a downstream product on top of Waterr’s voice API, these attributions must be surfaced to your users in a comparable location (e.g. your own docs or an About page). CC BY 4.0 permits commercial use with attribution; it does not permit removing the attribution requirement.

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Reporting

If you believe a voice on this list should not be available for commercial use, or if you are a rights holder with a concern, please contact us at [email protected] and we will remove it within 5 business days pending review.