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+// Copyright 2021 Benjamin Barenblat
+//
+// 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
+//
+//     https://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.
+
+#ifndef EC_SRC_UI_H_
+#define EC_SRC_UI_H_
+
+namespace ec {
+
+// A UI for EC.
+class Ui {
+ public:
+  virtual ~Ui() = default;
+
+  virtual int Main() noexcept = 0;
+};
+
+}  // namespace ec
+
+#endif  // EC_SRC_UI_H_