diff --git a/mediapipe/framework/api2/builder.h b/mediapipe/framework/api2/builder.h
index 2a98c416..da09acc8 100644
--- a/mediapipe/framework/api2/builder.h
+++ b/mediapipe/framework/api2/builder.h
@@ -206,6 +206,16 @@ class SourceImpl {
     return ConnectTo(dest);
   }
 
+  template <typename U>
+  bool operator==(const SourceImpl<IsSide, U>& other) {
+    return base_ == other.base_;
+  }
+
+  template <typename U>
+  bool operator!=(const SourceImpl<IsSide, U>& other) {
+    return !(*this == other);
+  }
+
   Src& SetName(std::string name) {
     base_->name_ = std::move(name);
     return *this;
@@ -218,6 +228,9 @@ class SourceImpl {
   }
 
  private:
+  template <bool, typename U>
+  friend class SourceImpl;
+
   // Never null.
   SourceBase* base_;
 };
diff --git a/mediapipe/framework/api2/builder_test.cc b/mediapipe/framework/api2/builder_test.cc
index 08f4f0ca..194f1b8f 100644
--- a/mediapipe/framework/api2/builder_test.cc
+++ b/mediapipe/framework/api2/builder_test.cc
@@ -494,5 +494,51 @@ TEST(BuilderTest, SinglePortAccessWorksThroughSlicing) {
   EXPECT_THAT(graph.GetConfig(), EqualsProto(expected));
 }
 
+TEST(BuilderTest, TestStreamEqualsNotEqualsOperators) {
+  Graph graph;
+  Stream<AnyType> input0 = graph.In(0);
+  EXPECT_TRUE(input0 == input0);
+  EXPECT_FALSE(input0 != input0);
+
+  EXPECT_TRUE(input0 == input0.Cast<int>());
+  EXPECT_FALSE(input0.Cast<float>() != input0);
+
+  EXPECT_TRUE(input0.Cast<float>() == input0.Cast<int>());
+  EXPECT_FALSE(input0.Cast<float>() != input0.Cast<int>());
+
+  Stream<AnyType> input1 = graph.In(1);
+  EXPECT_FALSE(input0 == input1);
+  EXPECT_TRUE(input0 != input1);
+
+  input1 = input0;
+  EXPECT_TRUE(input0 == input1);
+  EXPECT_FALSE(input0 != input1);
+  EXPECT_TRUE(input0.Cast<int>() == input1.Cast<int>());
+  EXPECT_FALSE(input0.Cast<float>() != input1.Cast<float>());
+}
+
+TEST(BuilderTest, TestSidePacketEqualsNotEqualsOperators) {
+  Graph graph;
+  SidePacket<AnyType> side_input0 = graph.SideIn(0);
+  EXPECT_TRUE(side_input0 == side_input0);
+  EXPECT_FALSE(side_input0 != side_input0);
+
+  EXPECT_TRUE(side_input0 == side_input0.Cast<int>());
+  EXPECT_FALSE(side_input0.Cast<float>() != side_input0);
+
+  EXPECT_TRUE(side_input0.Cast<float>() == side_input0.Cast<int>());
+  EXPECT_FALSE(side_input0.Cast<float>() != side_input0.Cast<int>());
+
+  SidePacket<AnyType> side_input1 = graph.SideIn(1);
+  EXPECT_FALSE(side_input0 == side_input1);
+  EXPECT_TRUE(side_input0 != side_input1);
+
+  side_input1 = side_input0;
+  EXPECT_TRUE(side_input0 == side_input1);
+  EXPECT_FALSE(side_input0 != side_input1);
+  EXPECT_TRUE(side_input0.Cast<int>() == side_input1.Cast<int>());
+  EXPECT_FALSE(side_input0.Cast<float>() != side_input1.Cast<float>());
+}
+
 }  // namespace
 }  // namespace mediapipe::api2::builder