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diff --git a/runtime/libs/misc/include/misc/tensor/Comparator.h b/runtime/libs/misc/include/misc/tensor/Comparator.h
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+/*
+ * Copyright (c) 2018 Samsung Electronics Co., Ltd. All Rights Reserved
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file Comparator.h
+ * @ingroup COM_AI_RUNTIME
+ * @brief This file contains nnfw::misc::tensor::Comparator class
+ */
+
+#ifndef __NNFW_MISC_TENSOR_COMPARATOR_H__
+#define __NNFW_MISC_TENSOR_COMPARATOR_H__
+
+#include "misc/tensor/Index.h"
+#include "misc/tensor/Shape.h"
+#include "misc/tensor/Reader.h"
+#include "misc/tensor/Diff.h"
+
+#include <functional>
+
+#include <vector>
+
+namespace nnfw
+{
+namespace misc
+{
+namespace tensor
+{
+
+/**
+ * @brief Class to compare two tensors (expected and obtained to compare)
+ */
+class Comparator
+{
+public:
+  /**
+   * @brief Construct a new @c Comparator object
+   * @param[in] fn     Function that compares two float values
+   */
+  Comparator(const std::function<bool(float lhs, float rhs)> &fn) : _compare_fn{fn}
+  {
+    // DO NOTHING
+  }
+
+public:
+  /**
+   * @brief Struct to observe comparison results
+   */
+  struct Observer
+  {
+    /**
+     * @brief Get notification of comparison result at every index of two tensors
+     * @param[in] index       Index of tensors compared
+     * @param[in] expected    Expected value of element at @c index
+     * @param[in] obtained    Obtained value of element at @c index
+     * @return    N/A
+     */
+    virtual void notify(const Index &index, float expected, float obtained) = 0;
+  };
+
+public:
+  /**
+   * @brief Compare two tensors
+   * @param[in] shape       Shape of two tensors
+   * @param[in] expected    @c Reader<float> object that accesses expected tensor
+   * @param[in] obtained    @c Reader<float> object that accesses obtained tensor
+   * @param[in] observer    @c Observer notified of expected value and obtained value at every index
+   * @return    @c std::vector<Diff<float>> containing information of failed comparison
+   */
+  // NOTE Observer should live longer than comparator
+  std::vector<Diff<float>> compare(const Shape &shape, const Reader<float> &expected,
+                                   const Reader<float> &obtained,
+                                   Observer *observer = nullptr) const;
+
+private:
+  std::function<bool(float lhs, float rhs)> _compare_fn;
+};
+
+} // namespace tensor
+} // namespace misc
+} // namespace nnfw
+
+#endif // __NNFW_MISC_TENSOR_COMPARATOR_H__