diff --git a/bin/cli.js b/bin/cli.js
index 2feaa9e7b1a..d080cd064cd 100755
--- a/bin/cli.js
+++ b/bin/cli.js
@@ -11,6 +11,7 @@ program
   .command('serve [input]')
   .description('starts a development server')
   .option('-p, --port <port>', 'set the port to serve on. defaults to 1234')
+  .option('-o, --open', 'automatically open in default browser')
   .option(
     '-d, --out-dir <path>',
     'set the output directory. defaults to "dist"'
@@ -93,7 +94,10 @@ function bundle(main, command) {
   const bundler = new Bundler(main, command);
 
   if (command.name() === 'serve') {
-    bundler.serve(command.port || 1234);
+    const server = bundler.serve(command.port || 1234);
+    if (command.open) {
+      require('opn')(`http://localhost:${server.address().port}`);
+    }
   } else {
     bundler.bundle();
   }
diff --git a/package.json b/package.json
index b2e9afc4258..d7a19751010 100644
--- a/package.json
+++ b/package.json
@@ -26,6 +26,7 @@
     "micromatch": "^3.0.4",
     "mkdirp": "^0.5.1",
     "node-libs-browser": "^2.0.0",
+    "opn": "^5.1.0",
     "parse-json": "^4.0.0",
     "physical-cpu-count": "^2.0.0",
     "postcss": "^6.0.10",
diff --git a/yarn.lock b/yarn.lock
index 782d0b2ecb1..b0f5529d494 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2508,6 +2508,10 @@ is-windows@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/is-windows/-/is-windows-1.0.1.tgz#310db70f742d259a16a369202b51af84233310d9"
 
+is-wsl@^1.1.0:
+  version "1.1.0"
+  resolved "https://registry.yarnpkg.com/is-wsl/-/is-wsl-1.1.0.tgz#1f16e4aa22b04d1336b66188a66af3c600c3a66d"
+
 isarray@1.0.0, isarray@^1.0.0, isarray@~1.0.0:
   version "1.0.0"
   resolved "https://registry.yarnpkg.com/isarray/-/isarray-1.0.0.tgz#bb935d48582cba168c06834957a54a3e07124f11"
@@ -3413,6 +3417,12 @@ onetime@^1.0.0:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/onetime/-/onetime-1.1.0.tgz#a1f7838f8314c516f05ecefcbc4ccfe04b4ed789"
 
+opn@^5.1.0:
+  version "5.1.0"
+  resolved "https://registry.yarnpkg.com/opn/-/opn-5.1.0.tgz#72ce2306a17dbea58ff1041853352b4a8fc77519"
+  dependencies:
+    is-wsl "^1.1.0"
+
 optimist@^0.6.1:
   version "0.6.1"
   resolved "https://registry.yarnpkg.com/optimist/-/optimist-0.6.1.tgz#da3ea74686fa21a19a111c326e90eb15a0196686"