diff --git a/gui.go b/gui.go
new file mode 100644
index 0000000..6ad3440
--- /dev/null
+++ b/gui.go
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2017 Alex Yatskov <alex@foosoft.net>
+ * Author: Alex Yatskov <alex@foosoft.net>
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of
+ * this software and associated documentation files (the "Software"), to deal in
+ * the Software without restriction, including without limitation the rights to
+ * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+ * the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+ * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+ * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+ * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package main
+
+import (
+	"github.com/andlabs/ui"
+)
+
+func gui() error {
+	return ui.Main(func() {
+		pathEntry := ui.NewEntry()
+		browseButton := ui.NewButton("Browse")
+		pathBox := ui.NewHorizontalBox()
+		pathBox.Append(pathEntry, true)
+		pathBox.Append(browseButton, false)
+
+		portSpin := ui.NewSpinbox(0, 65535)
+		portSpin.SetValue(9876)
+
+		formatCombo := ui.NewCombobox()
+		formatCombo.Append("EPWING")
+		formatCombo.Append("EDICT")
+		formatCombo.Append("ENAMDICT")
+		formatCombo.Append("KANJIDIC")
+		formatCombo.SetSelected(0)
+
+		titleEntry := ui.NewEntry()
+		outputLabel := ui.NewLabel("")
+		importButton := ui.NewButton("Import...")
+
+		mainBox := ui.NewVerticalBox()
+		mainBox.Append(ui.NewLabel("Path to dictionary source (CATALOGS file for EPWING):"), false)
+		mainBox.Append(pathBox, false)
+		mainBox.Append(ui.NewLabel("Network port for extension server:"), false)
+		mainBox.Append(portSpin, false)
+		mainBox.Append(ui.NewLabel("Dictionary title (leave blank for default):"), false)
+		mainBox.Append(titleEntry, false)
+		mainBox.Append(ui.NewLabel("Dictionary format:"), false)
+		mainBox.Append(formatCombo, false)
+		mainBox.Append(ui.NewLabel("Application output:"), false)
+		mainBox.Append(outputLabel, true)
+		mainBox.Append(importButton, false)
+
+		window := ui.NewWindow("Yomichan Import", 640, 480, false)
+		window.SetMargined(true)
+		window.SetChild(mainBox)
+
+		browseButton.OnClicked(func(*ui.Button) {
+			if path := ui.OpenFile(window); len(path) > 0 {
+				pathEntry.SetText(path)
+			}
+		})
+
+		window.OnClosing(func(*ui.Window) bool {
+			ui.Quit()
+			return true
+		})
+
+		window.Show()
+	})
+}
diff --git a/main.go b/main.go
index 13c0529..c06e9e5 100644
--- a/main.go
+++ b/main.go
@@ -81,8 +81,12 @@ func main() {
 	)
 
 	if flag.NArg() == 0 {
-		usage()
-		os.Exit(2)
+		if err := gui(); err == nil {
+			return
+		} else {
+			usage()
+			os.Exit(2)
+		}
 	} else {
 		inputPath = flag.Arg(0)
 		if flag.NArg() > 1 {