diff --git a/docs/.vitepress/config.mts b/docs/.vitepress/config.mts
index 26f0a0d..0f1e80c 100644
--- a/docs/.vitepress/config.mts
+++ b/docs/.vitepress/config.mts
@@ -1,8 +1,6 @@
-import fs from "node:fs";
-import type { IncomingMessage, ServerResponse } from "node:http";
-import path from "node:path";
-import type { Connect, Plugin, ViteDevServer } from "vite";
 import { defineConfig, type MarkdownOptions } from "vitepress";
+import { mp3DownloaderPlugin } from "./vite-plugins/mp3-downloader";
+import { gttsPlugin } from "./vite-plugins/gtts";
 
 const host = process.env.TAURI_DEV_HOST;
 
@@ -69,7 +67,12 @@ export default defineConfig({
     },
   },
   vite: {
-    plugins: [audioProxyPlugin() as any],
+    plugins: [
+      mp3DownloaderPlugin() as any,
+      // (Python) pip install gtts
+      // gtts will intercept /api/tts away from opentts:ko container
+      gttsPlugin(),
+    ],
     envDir: process.cwd(),
     ssr: {
       noExternal: [],
@@ -98,6 +101,10 @@ export default defineConfig({
             port: 5174,
           }
         : undefined,
+      proxy: {
+        // docker run -it -p 5500:5500 synesthesiam/opentts:ko
+        "/api/tts": "http://localhost:5500",
+      },
     },
     // Env variables starting with the item of `envPrefix` will be exposed in tauri's source code through `import.meta.env`.
     envPrefix: ["VITE_", "TAURI_ENV_*"],
@@ -112,56 +119,3 @@ export default defineConfig({
     },
   },
 });
-
-function audioProxyPlugin(): Plugin {
-  return {
-    name: "audio-proxy",
-    configureServer(server: ViteDevServer) {
-      // Vite dev server middlewares are connect-style: (req, res, next)
-      server.middlewares.use(async (req, res, next) => {
-        const reqUrl = req.url;
-        if (!reqUrl || !reqUrl.startsWith("/uploads/")) return next();
-        if (!reqUrl.endsWith(".mp3")) return next();
-
-        try {
-          await proxyAudio(req, res, next);
-        } catch (e) {
-          console.error(e, reqUrl);
-          next();
-        }
-      });
-    },
-  };
-}
-
-async function proxyAudio(
-  req: Connect.IncomingMessage,
-  res: ServerResponse<IncomingMessage>,
-  next: Connect.NextFunction,
-) {
-  const url = new URL(`https://www.howtostudykorean.com/wp-content${req.url}`);
-
-  const segs = req.url!.slice(1).split("/");
-  const filename = segs.pop()!;
-  const saveroot = "docs/public";
-  const saveto = path.join(saveroot, ...segs, filename);
-
-  if (fs.existsSync(saveto)) {
-    return next();
-  }
-
-  fs.mkdirSync(path.join(saveroot, ...segs), { recursive: true });
-
-  const r = await fetch(url, { redirect: "follow" });
-  if (!r.ok) {
-    console.error(r);
-    return next();
-  }
-
-  fs.writeFileSync(saveto, Buffer.from(await r.arrayBuffer()));
-  // console.log(fs.statSync(saveto));
-  console.log("saved to", saveto);
-
-  res.setHeader("Content-Type", "audio/mpeg");
-  fs.createReadStream(saveto).pipe(res);
-}
diff --git a/docs/.vitepress/theme/components/TTS.vue b/docs/.vitepress/theme/components/TTS.vue
index 1276811..637e78e 100644
--- a/docs/.vitepress/theme/components/TTS.vue
+++ b/docs/.vitepress/theme/components/TTS.vue
@@ -46,7 +46,7 @@ async function playAudio() {
   if (navigator.platform === "Win32" || !(await playAudioTTSPlugin())) {
     if (!audioEl.value) return;
 
-    const url = new URL("http://localhost:5500/api/tts");
+    const url = new URL("/api/tts", location.origin);
     url.searchParams.set("voice", "glow-speak:ko_kss");
     url.searchParams.set("text", getMainText());
 
diff --git a/docs/.vitepress/vite-plugins/gtts.ts b/docs/.vitepress/vite-plugins/gtts.ts
new file mode 100644
index 0000000..3183606
--- /dev/null
+++ b/docs/.vitepress/vite-plugins/gtts.ts
@@ -0,0 +1,82 @@
+import fs from "node:fs";
+import type { IncomingMessage, ServerResponse } from "node:http";
+import path from "node:path";
+import type { Connect, Plugin, ViteDevServer } from "vite";
+import { spawn } from "child_process";
+
+export function gttsPlugin(): Plugin {
+  return {
+    name: "gtts",
+    configureServer(server: ViteDevServer) {
+      // Vite dev server middlewares are connect-style: (req, res, next)
+      server.middlewares.use(async (req, res, next) => {
+        const reqUrl = req.url;
+        if (!reqUrl) return next();
+
+        const url = new URL(reqUrl, "http://localhost");
+        if (url.pathname !== "/api/tts") return next();
+
+        const text = url.searchParams.get("text");
+        if (!text) return next();
+
+        try {
+          await gtts(text, req, res, next);
+        } catch (e) {
+          console.error(e, reqUrl);
+          next();
+        }
+      });
+    },
+  };
+}
+
+let fileList: Record<string, number> = {};
+
+async function gtts(
+  text: string,
+  req: Connect.IncomingMessage,
+  res: ServerResponse<IncomingMessage>,
+  next: Connect.NextFunction,
+) {
+  text = text.replace(/["]/g, " ");
+
+  const saveroot = "docs/.vitepress/cache/gtts";
+  fs.mkdirSync(saveroot, { recursive: true });
+
+  const fileListJSON = path.join(saveroot, "gtts.json");
+
+  if (Object.keys(fileList).length === 0 && fs.existsSync(fileListJSON)) {
+    fileList = JSON.parse(fs.readFileSync(fileListJSON, "utf-8"));
+  }
+
+  const fileNo = fileList[text] || Object.keys(fileList).length;
+  const filename = `${fileNo}.mp3`;
+  const saveto = path.join(saveroot, filename);
+
+  if (!fs.existsSync(saveto)) {
+    await new Promise((resolve, reject) => {
+      const p = spawn(
+        "gtts-cli",
+        [
+          `"${text}"`,
+          ...["--lang", "ko"],
+          ...["--output", path.join(process.cwd(), saveto)],
+        ],
+        {
+          stdio: "inherit",
+          shell: true,
+        },
+      );
+      p.on("error", reject).on("close", resolve);
+    });
+    fileList[text] = fileNo;
+    console.log(`gtts: ${text} saved to ${saveto}`);
+
+    fs.writeFileSync(fileListJSON, JSON.stringify(fileList, null, 2));
+  } else {
+    // console.log(`gtts: ${text} loaded from ${saveto}`);
+  }
+
+  res.setHeader("Content-Type", "audio/mpeg");
+  fs.createReadStream(saveto).pipe(res);
+}
diff --git a/docs/.vitepress/vite-plugins/mp3-downloader.ts b/docs/.vitepress/vite-plugins/mp3-downloader.ts
new file mode 100644
index 0000000..b7f1491
--- /dev/null
+++ b/docs/.vitepress/vite-plugins/mp3-downloader.ts
@@ -0,0 +1,57 @@
+import fs from "node:fs";
+import type { IncomingMessage, ServerResponse } from "node:http";
+import path from "node:path";
+import type { Connect, Plugin, ViteDevServer } from "vite";
+
+export function mp3DownloaderPlugin(): Plugin {
+  return {
+    name: "mp3-downloader",
+    configureServer(server: ViteDevServer) {
+      // Vite dev server middlewares are connect-style: (req, res, next)
+      server.middlewares.use(async (req, res, next) => {
+        const reqUrl = req.url;
+        if (!reqUrl || !reqUrl.startsWith("/uploads/")) return next();
+        if (!reqUrl.endsWith(".mp3")) return next();
+
+        try {
+          await mp3Downloader(req, res, next);
+        } catch (e) {
+          console.error(e, reqUrl);
+          next();
+        }
+      });
+    },
+  };
+}
+
+async function mp3Downloader(
+  req: Connect.IncomingMessage,
+  res: ServerResponse<IncomingMessage>,
+  next: Connect.NextFunction,
+) {
+  const url = new URL(`https://www.howtostudykorean.com/wp-content${req.url}`);
+
+  const segs = req.url!.slice(1).split("/");
+  const filename = segs.pop()!;
+  const saveroot = "docs/public";
+  const saveto = path.join(saveroot, ...segs, filename);
+
+  if (fs.existsSync(saveto)) {
+    return next();
+  }
+
+  fs.mkdirSync(path.join(saveroot, ...segs), { recursive: true });
+
+  const r = await fetch(url, { redirect: "follow" });
+  if (!r.ok) {
+    console.error(r);
+    return next();
+  }
+
+  fs.writeFileSync(saveto, Buffer.from(await r.arrayBuffer()));
+  // console.log(fs.statSync(saveto));
+  console.log("saved to", saveto);
+
+  res.setHeader("Content-Type", "audio/mpeg");
+  fs.createReadStream(saveto).pipe(res);
+}
diff --git a/package.json b/package.json
index a11d62f..d7a6c31 100644
--- a/package.json
+++ b/package.json
@@ -31,6 +31,7 @@
     "@types/node": "^24.13.3",
     "markdown-it": "^14.3.0",
     "pdfjs-dist": "^5.7.284",
+    "shell-quote": "^1.10.0",
     "tauri-plugin-tts-api": "^0.1.11",
     "vite": "^8.1.5",
     "yaml": "^2.9.0",
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 36969ec..a3911ca 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -26,6 +26,9 @@ importers:
       pdfjs-dist:
         specifier: ^5.7.284
         version: 5.7.284
+      shell-quote:
+        specifier: ^1.10.0
+        version: 1.10.0
       tauri-plugin-tts-api:
         specifier: ^0.1.11
         version: 0.1.11
@@ -1088,6 +1091,10 @@ packages:
     engines: {node: '>=18.0.0', npm: '>=8.0.0'}
     hasBin: true
 
+  shell-quote@1.10.0:
+    resolution: {integrity: sha512-w1aiOKwKuRgtwAReIIj89puqg+I7GvX4IbLrvmhXbzQsj1+Zwi4VO3+fa6ZF91TWSjIxoEkKnMeHcLEODK5ZXA==}
+    engines: {node: '>= 0.4'}
+
   shiki@3.23.0:
     resolution: {integrity: sha512-55Dj73uq9ZXL5zyeRPzHQsK7Nbyt6Y10k5s7OjuFZGMhpp4r/rsLBH0o/0fstIzX1Lep9VxefWljK/SKCzygIA==}
 
@@ -2109,6 +2116,8 @@ snapshots:
       '@rollup/rollup-win32-x64-msvc': 4.62.2
       fsevents: 2.3.3
 
+  shell-quote@1.10.0: {}
+
   shiki@3.23.0:
     dependencies:
       '@shikijs/core': 3.23.0