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Supertonic

Run Supertonic locally and connect it to OpenReader using the Custom OpenAI-Like provider. Supertonic is a fast, on-device TTS engine that ships its own OpenAI-compatible HTTP server.

No Docker image

Supertonic does not publish a Docker image — it installs as a Python package and runs as a local HTTP server. These instructions assume OpenReader itself runs in Docker (the common case); see Running OpenReader directly on the host if you don't.

Run Supertonic​

Install with pip (or pipx for an isolated install) and start the server:

pipx install 'supertonic[serve]'   # or: pip install 'supertonic[serve]'
supertonic serve                   # defaults; loopback only

The first run downloads the model (~400MB). Once it's up, the OpenAI-compatible endpoint is at http://127.0.0.1:7788/v1/audio/speech and interactive docs are at http://127.0.0.1:7788/docs.

  • Models: supertonic-3 (default) or supertonic-2.
  • Voices: built-ins M1–M5 and F1–F5, plus any custom voices you import. OpenReader discovers them automatically via the /v1/styles endpoint.
  • Audio format: Supertonic emits wav by default; OpenReader transcodes it to mp3 transparently, so no extra configuration is needed.

Connect to OpenReader​

From a Docker container, your host machine is reachable at host.docker.internal, so the base URL is http://host.docker.internal:7788/v1. On Docker Desktop (macOS/Windows) this reaches the loopback-bound server above with no extra setup.

Linux (native Docker Engine)

On native Linux Docker, host.docker.internal needs --add-host=host.docker.internal:host-gateway on the OpenReader container (or the equivalent extra_hosts entry in docker-compose.yml), and it routes to the host's bridge interface rather than loopback. Pick one:

  • Run the OpenReader container with --network host (or network_mode: host), keep Supertonic on --host 127.0.0.1, and use http://127.0.0.1:7788/v1 as the base URL.
  • Or start Supertonic with --host 0.0.0.0 so the bridge can reach it — keep it on a trusted network or behind a firewall.

Recommended (auth + admin): Settings → Admin → Shared providers

  1. Add a shared provider with type custom-openai.
  2. Set base URL to http://host.docker.internal:7788/v1.
  3. Leave API key blank — supertonic serve does not require one.
  4. Set default model to supertonic-3 (or supertonic-2).

Legacy bootstrap seed (optional, first boot only):

API_BASE=http://host.docker.internal:7788/v1

Users select the configured shared provider, model, and voice from Settings → TTS Provider.

Running OpenReader directly on the host​

If OpenReader runs on the same machine (e.g. pnpm dev) rather than in Docker, skip host.docker.internal and use http://127.0.0.1:7788/v1 as the base URL everywhere above.

References​