diff --git a/Libraries/Utilities/PlatformOS.android.js b/Libraries/Utilities/PlatformOS.android.js
new file mode 100644
index 00000000000000..2da52e6e711ce9
--- /dev/null
+++ b/Libraries/Utilities/PlatformOS.android.js
@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule PlatformOS
+ * @flow
+ */
+
+'use strict';
+
+export type PlatformSelectSpec<A, I> = {|
+  android: A,
+  ios: I,
+|};
+
+const PlatformOS = {
+  OS: 'android',
+  select: <A, I> (spec: PlatformSelectSpec<A, I>): A | I => spec.android,
+};
+
+module.exports = PlatformOS;
diff --git a/Libraries/Utilities/PlatformOS.ios.js b/Libraries/Utilities/PlatformOS.ios.js
new file mode 100644
index 00000000000000..c9891368d8981f
--- /dev/null
+++ b/Libraries/Utilities/PlatformOS.ios.js
@@ -0,0 +1,25 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @providesModule PlatformOS
+ * @flow
+ */
+
+'use strict';
+
+export type PlatformSelectSpec<A, I> = {|
+  android: A,
+  ios: I,
+|};
+
+const PlatformOS = {
+  OS: 'ios',
+  select: <A, I> (spec: PlatformSelectSpec<A, I>): A | I => spec.ios,
+};
+
+module.exports = PlatformOS;