Licences and notices

Speechable is built on open-source software and openly licensed models. This page lists those components and their licences, and provides the attributions their licences require. We are grateful to everyone who made them.

Speech model use restrictions

The Supertonic-3 model is licensed under the BigScience Open RAIL-M License, which places binding restrictions on how it may be used — including prohibitions on impersonating people without consent and on publishing generated content without disclosing that it is machine generated. These apply to you when you use Speechable's speech features. See the Text-to-Speech Model Terms and the full licence text.

Models

Machine-learning models used for speech synthesis, transcription and document understanding.

  • Supertonic-3by Supertone Inc.BigScience Open RAIL-M

    Cloud and on-device speech synthesis. Speechable distributes fp16 and int8 quantised derivatives. Use restrictions apply — see the Text-to-Speech Model Terms.

  • Kokoro-82Mby hexgradApache-2.0

    On-device speech synthesis (legacy eco mode) and hosted inference.

Software

  • Next.jsby VercelMIT
  • Reactby MetaMIT
  • ONNX Runtimeby MicrosoftMIT
  • libvipsby John Cupitt and contributorsLGPL-3.0-or-later

    Server-side image resizing and re-encoding, via sharp. Licence text, written source offer and relinking information are on the linked page.

  • eSpeak NGby eSpeak NG contributorsGPL-3.0-or-later

    Phonemisation for the on-device speech engine. Fetched by your browser directly from the jsDelivr CDN at runtime — Speechable does not host or redistribute it.

  • shadcn/uiby shadcnMIT

    User-interface components.

  • Lucideby Lucide contributorsISC

    Icons.

  • motion-primitivesby ibelickMIT
  • Tailwind CSSby Tailwind LabsMIT
  • TipTapby Tiptap GmbHMIT

    Document editor.

  • pdf.jsby MozillaApache-2.0

    PDF parsing.

  • Readabilityby MozillaApache-2.0

    Web article extraction.

  • Mammothby Michael WilliamsonBSD-2-Clause

    DOCX conversion.

  • sharp / libvipsby Lovell Fuller and contributorsApache-2.0 / LGPL-3.0-or-later

    Image processing.

  • caniuse-liteby caniuse contributorsCC-BY-4.0

    Browser-support data compiled into the client bundle.

Fonts and artwork

Full dependency list

The components above are those whose licences require attribution, or that are central to how Speechable works. Speechable also depends on several hundred further open-source packages, predominantly under the MIT, ISC, Apache-2.0 and BSD licences. For a complete list, or for a copy of any licence not linked here, contact [email protected].