diff --git a/src/isomorphic/ReactDebugTool.js b/src/isomorphic/ReactDebugTool.js
index 63f3251847..5145f8ab31 100644
--- a/src/isomorphic/ReactDebugTool.js
+++ b/src/isomorphic/ReactDebugTool.js
@@ -115,6 +115,9 @@ var ReactDebugTool = {
       }
     }
   },
+  isProfiling() {
+    return isProfiling;
+  },
   beginProfiling() {
     if (__DEV__) {
       if (isProfiling) {
diff --git a/src/isomorphic/ReactPerf.js b/src/isomorphic/ReactPerf.js
index 01f1aee388..209651e216 100644
--- a/src/isomorphic/ReactPerf.js
+++ b/src/isomorphic/ReactPerf.js
@@ -351,6 +351,10 @@ function stop() {
   ReactDebugTool.endProfiling();
 }
 
+function isRunning() {
+  return ReactDebugTool.isProfiling();
+}
+
 var ReactPerfAnalysis = {
   getLastMeasurements: getFlushHistory,
   getExclusive,
@@ -363,6 +367,7 @@ var ReactPerfAnalysis = {
   printOperations,
   start,
   stop,
+  isRunning,
   // Deprecated:
   printDOM,
   getMeasurementsSummaryMap,
diff --git a/src/isomorphic/__tests__/ReactDebugTool-test.js b/src/isomorphic/__tests__/ReactDebugTool-test.js
index bae09516f5..889b909798 100644
--- a/src/isomorphic/__tests__/ReactDebugTool-test.js
+++ b/src/isomorphic/__tests__/ReactDebugTool-test.js
@@ -72,4 +72,14 @@ describe('ReactDebugTool', function() {
     ReactDebugTool.onTestEvent();
     expect(console.error.calls.length).toBe(1);
   });
+
+  it('returns isProfiling state', () => {
+    expect(ReactDebugTool.isProfiling()).toBe(false);
+
+    ReactDebugTool.beginProfiling();
+    expect(ReactDebugTool.isProfiling()).toBe(true);
+
+    ReactDebugTool.endProfiling();
+    expect(ReactDebugTool.isProfiling()).toBe(false);
+  });
 });
diff --git a/src/isomorphic/__tests__/ReactPerf-test.js b/src/isomorphic/__tests__/ReactPerf-test.js
index 644bc618b8..81e5131855 100644
--- a/src/isomorphic/__tests__/ReactPerf-test.js
+++ b/src/isomorphic/__tests__/ReactPerf-test.js
@@ -16,6 +16,7 @@ describe('ReactPerf', function() {
   var ReactDOM;
   var ReactPerf;
   var ReactTestUtils;
+  var ReactDebugTool;
 
   var App;
   var Box;
@@ -36,6 +37,7 @@ describe('ReactPerf', function() {
     ReactDOM = require('ReactDOM');
     ReactPerf = require('ReactPerf');
     ReactTestUtils = require('ReactTestUtils');
+    ReactDebugTool = require('ReactDebugTool');
 
     App = React.createClass({
       render: function() {
@@ -283,4 +285,12 @@ describe('ReactPerf', function() {
     ReactPerf.printDOM(measurements);
     expect(console.error.calls.length).toBe(1);
   });
+
+  it('returns isRunning state', () => {
+    spyOn(ReactDebugTool, 'isProfiling');
+
+    ReactPerf.isRunning();
+    expect(ReactDebugTool.isProfiling.calls.length).toBe(1);
+    expect(ReactPerf.isRunning()).toBe(ReactDebugTool.isProfiling());
+  });
 });