diff --git a/README.md b/README.md
index 89fb287..e7536c2 100644
--- a/README.md
+++ b/README.md
@@ -26,6 +26,7 @@ the new project as `docs/conventions.md`; it is the house style.
 
 Run the demo locally from a new project:
 
+    npm run dev:all     # server and site together; Ctrl-C stops both
     npm run server      # the game server on its port
     npm run dev -- --host
 
diff --git a/template/package.json b/template/package.json
index 4917684..b04fe4b 100644
--- a/template/package.json
+++ b/template/package.json
@@ -5,6 +5,7 @@
 	"type": "module",
 	"scripts": {
 		"dev": "vite dev",
+		"dev:all": "node scripts/dev-all.mjs",
 		"build": "vite build",
 		"preview": "vite preview",
 		"prepare": "svelte-kit sync || echo ''",
diff --git a/template/scripts/dev-all.mjs b/template/scripts/dev-all.mjs
new file mode 100644
index 0000000..ac793ec
--- /dev/null
+++ b/template/scripts/dev-all.mjs
@@ -0,0 +1,31 @@
+// The game server and the site together, for playing locally: one terminal,
+// each line marked with its side, and Ctrl-C (or either one stopping) stops both.
+import { spawn } from 'node:child_process';
+
+const sides = [
+	['server', ['run', 'server']],
+	['site', ['run', 'dev', '--', ...process.argv.slice(2)]]
+];
+const children = sides.map(([name, args]) => {
+	const child = spawn('npm', args, { stdio: ['inherit', 'pipe', 'pipe'] });
+	for (const stream of [child.stdout, child.stderr]) {
+		let rest = '';
+		stream.on('data', (chunk) => {
+			const lines = (rest + chunk).split('\n');
+			rest = lines.pop();
+			for (const line of lines) console.log(`[${name}] ${line}`);
+		});
+	}
+	child.on('exit', (code) => stop(code ?? 0));
+	return child;
+});
+
+let stopping = false;
+function stop(code) {
+	if (stopping) return;
+	stopping = true;
+	for (const c of children) if (c.exitCode === null) c.kill('SIGTERM');
+	process.exitCode = code;
+}
+process.on('SIGINT', () => stop(0));
+process.on('SIGTERM', () => stop(0));