diff --git a/docs-site/docs/configure/tts-provider-guides/supertonic.md b/docs-site/docs/configure/tts-provider-guides/supertonic.md
new file mode 100644
index 0000000..498504a
--- /dev/null
+++ b/docs-site/docs/configure/tts-provider-guides/supertonic.md
@@ -0,0 +1,68 @@
+---
+title: Supertonic
+---
+
+Run [Supertonic](https://github.com/supertone-inc/supertonic-py) 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.
+
+:::note 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](#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:
+
+```bash
+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.
+
+:::note 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):**
+
+```env
+API_BASE=http://host.docker.internal:7788/v1
+```
+
+**Or in-app via Settings → TTS Provider:**
+
+1. Set provider to `Custom OpenAI-Like`.
+2. Set `API_BASE` to `http://host.docker.internal:7788/v1`.
+3. Leave `API_KEY` blank.
+4. Choose model `supertonic-3` (or the model your deployment exposes).
+
+See [TTS Providers](../tts-providers) for admin-shared vs per-user behavior.
+
+## 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
+
+- [supertone-inc/supertonic-py](https://github.com/supertone-inc/supertonic-py)
+- [Supported Languages](https://github.com/supertone-inc/supertonic-py#supported-languages)
+- [TTS Providers](../tts-providers)
+- [TTS Environment Variables](../../reference/environment-variables#tts-provider-and-request-behavior)
diff --git a/docs-site/docs/configure/tts-providers.md b/docs-site/docs/configure/tts-providers.md
index fac1813..376e1dc 100644
--- a/docs-site/docs/configure/tts-providers.md
+++ b/docs-site/docs/configure/tts-providers.md
@@ -45,6 +45,7 @@ TTS requests originate from the **Next.js server**, not the browser. `API_BASE`
 - [Kokoro-FastAPI](./tts-provider-guides/kokoro-fastapi)
 - [KittenTTS-FastAPI](./tts-provider-guides/kitten-tts-fastapi)
 - [Orpheus-FastAPI](./tts-provider-guides/orpheus-fastapi)
+- [Supertonic](./tts-provider-guides/supertonic)
 - [Replicate](./tts-provider-guides/replicate)
 - [DeepInfra](./tts-provider-guides/deepinfra)
 - [OpenAI](./tts-provider-guides/openai)
diff --git a/docs-site/sidebars.ts b/docs-site/sidebars.ts
index fe5d1a3..30033c2 100644
--- a/docs-site/sidebars.ts
+++ b/docs-site/sidebars.ts
@@ -23,6 +23,7 @@ const sidebars: SidebarsConfig = {
             'configure/tts-provider-guides/kokoro-fastapi',
             'configure/tts-provider-guides/kitten-tts-fastapi',
             'configure/tts-provider-guides/orpheus-fastapi',
+            'configure/tts-provider-guides/supertonic',
             'configure/tts-provider-guides/replicate',
             'configure/tts-provider-guides/deepinfra',
             'configure/tts-provider-guides/openai',