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diff --git a/src/ui/stream.h b/src/ui/stream.h
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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.
+
+// Stream-oriented interfaces to EC.
+
+#ifndef EC_SRC_UI_STREAM_H_
+#define EC_SRC_UI_STREAM_H_
+
+#include <iostream>
+#include <istream>
+#include <ostream>
+
+#include "src/ui.h"
+
+namespace ec {
+
+// A line-mode interpreter working on streams.
+class LineUi : public Ui {
+ public:
+  explicit LineUi(std::istream& in = std::cin, std::ostream& out = std::cout)
+      : in_(in), out_(out) {}
+
+  int Main() noexcept override;
+
+ private:
+  std::istream& in_;
+  std::ostream& out_;
+};
+
+// A batch-mode interpreter working on streams.
+class StreamUi : public Ui {
+ public:
+  explicit StreamUi(std::istream& in = std::cin, std::ostream& out = std::cout)
+      : in_(in), out_(out) {}
+
+  int Main() noexcept override;
+
+ private:
+  std::istream& in_;
+  std::ostream& out_;
+};
+
+}  // namespace ec
+
+#endif  // EC_SRC_UI_STREAM_H_