diff --git a/emmental/header/__init__.py b/emmental/header/__init__.py
index 81eac09..dba4d9f 100644
--- a/emmental/header/__init__.py
+++ b/emmental/header/__init__.py
@@ -4,6 +4,8 @@ from gi.repository import GObject
 from gi.repository import Gtk
 from gi.repository import Adw
 from .. import db
+if __debug__:
+    from . import settings
 
 SUBTITLE = "The Cheesy Music Player"
 
@@ -23,4 +25,14 @@ class Header(Gtk.HeaderBar):
         self.bind_property("title", self._title, "title")
         self.bind_property("subtitle", self._title, "subtitle")
 
+        if __debug__:
+            self._window = settings.Window(sql)
+            self._settings = Gtk.Button.new_from_icon_name("settings-symbolic")
+            self._settings.connect("clicked", self.__run_settings)
+            self.pack_start(self._settings)
+
         self.set_title_widget(self._title)
+
+    def __run_settings(self, button: Gtk.Button) -> None:
+        if __debug__:
+            self._window.present()
diff --git a/emmental/header/settings.py b/emmental/header/settings.py
new file mode 100644
index 0000000..37544c0
--- /dev/null
+++ b/emmental/header/settings.py
@@ -0,0 +1,66 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""A custom Gtk.Dialog for showing Settings."""
+from gi.repository import Gtk
+from gi.repository import Adw
+from .. import db
+from .. import entry
+from .. import factory
+
+
+class ValueRow(factory.ListRow):
+    """A Row for displaying settings values."""
+
+    def do_bind(self) -> None:
+        """Bind a db.Setting to this Row."""
+        if isinstance(self.item.value, bool):
+            self.child = Gtk.Switch(halign=Gtk.Align.START)
+            self.bind_and_set_property("value", "active", bidirectional=True)
+        elif isinstance(self.item.value, str):
+            self.child = entry.String(has_frame=False)
+            self.bind_and_set_property("value", "value", bidirectional=True)
+        elif isinstance(self.item.value, int):
+            self.child = entry.Integer(has_frame=False)
+            self.bind_and_set_property("value", "value", bidirectional=True)
+        elif isinstance(self.item.value, float):
+            self.child = entry.Float(has_frame=False)
+            self.bind_and_set_property("value", "value", bidirectional=True)
+
+
+class Window(Adw.Window):
+    """A custom window that displays the current settings."""
+
+    def __init__(self, sql: db.Connection):
+        """Initialize the Settings window."""
+        super().__init__(default_width=500, default_height=500,
+                         title="Emmental Settings", icon_name="settings",
+                         hide_on_close=True,
+                         content=Gtk.Box.new(Gtk.Orientation.VERTICAL, 0))
+        self._search = entry.Filter(what="settings")
+        self._header = Gtk.HeaderBar(title_widget=self._search)
+        self._selection = Gtk.NoSelection(model=sql.settings)
+        self._view = Gtk.ColumnView(model=self._selection,
+                                    show_row_separators=True)
+        self._scroll = Gtk.ScrolledWindow(child=self._view, vexpand=True)
+
+        self._scroll.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
+
+        self.__append_column(factory.InscriptionFactory("key"),
+                             "Key", width=400)
+        self.__append_column(factory.Factory(row_type=ValueRow),
+                             "Value", width=100)
+
+        self.get_content().append(self._header)
+        self.get_content().append(self._scroll)
+
+        if __debug__:
+            self.add_css_class("devel")
+        self._search.connect("search-changed", self.__filter)
+
+    def __append_column(self, factory: factory.Factory,
+                        title: str, *, width: int) -> None:
+        self._view.append_column(Gtk.ColumnViewColumn(factory=factory,
+                                                      title=title,
+                                                      fixed_width=width))
+
+    def __filter(self, entry: entry.Filter) -> None:
+        self._selection.get_model().filter(entry.get_query())
diff --git a/icons/scalable/actions/settings-symbolic.svg b/icons/scalable/actions/settings-symbolic.svg
new file mode 100644
index 0000000..408d7e5
--- /dev/null
+++ b/icons/scalable/actions/settings-symbolic.svg
@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<svg xmlns="http://www.w3.org/2000/svg" height="16px" viewBox="0 0 16 16" width="16px"><path d="m 7.5 1.019531 c -0.550781 0 -0.996094 0.445313 -0.996094 0.996094 v 0.453125 c -0.472656 0.128906 -0.929687 0.320312 -1.355468 0.566406 l -0.324219 -0.324218 c -0.390625 -0.390626 -1.019531 -0.390626 -1.410157 0 l -0.703124 0.707031 c -0.390626 0.390625 -0.390626 1.019531 0 1.410156 l 0.320312 0.320313 c -0.246094 0.425781 -0.433594 0.882812 -0.5625 1.355468 h -0.453125 c -0.550781 0 -0.996094 0.445313 -0.996094 0.996094 v 1 c 0 0.550781 0.445313 0.996094 0.996094 0.996094 h 0.449219 c 0.132812 0.472656 0.320312 0.929687 0.566406 1.355468 l -0.320312 0.320313 c -0.390626 0.390625 -0.390626 1.019531 0 1.410156 l 0.703124 0.707031 c 0.390626 0.390626 1.019532 0.390626 1.410157 0 l 0.320312 -0.320312 c 0.429688 0.242188 0.882813 0.433594 1.359375 0.558594 v 0.457031 c 0 0.550781 0.445313 0.996094 0.996094 0.996094 h 0.996094 c 0.554687 0 1 -0.445313 1 -0.996094 v -0.453125 c 0.472656 -0.128906 0.929687 -0.320312 1.355468 -0.566406 l 0.320313 0.324218 c 0.390625 0.390626 1.019531 0.390626 1.410156 0 l 0.707031 -0.707031 c 0.390626 -0.390625 0.390626 -1.019531 0 -1.410156 l -0.320312 -0.320313 c 0.242188 -0.425781 0.433594 -0.882812 0.558594 -1.355468 h 0.453125 c 0.554687 0 1 -0.445313 1 -0.996094 v -1 c 0 -0.550781 -0.445313 -0.996094 -1 -0.996094 h -0.449219 c -0.128906 -0.472656 -0.320312 -0.929687 -0.566406 -1.355468 l 0.324218 -0.320313 c 0.390626 -0.390625 0.390626 -1.019531 0 -1.410156 l -0.707031 -0.707031 c -0.390625 -0.390626 -1.019531 -0.390626 -1.410156 0 l -0.320313 0.320312 c -0.425781 -0.242188 -0.882812 -0.429688 -1.355468 -0.558594 v -0.457031 c 0 -0.550781 -0.445313 -0.996094 -1 -0.996094 z m 0.515625 3.976563 c 1.660156 0 3 1.34375 3 3 s -1.339844 3 -3 3 c -1.65625 0 -3 -1.34375 -3 -3 s 1.34375 -3 3 -3 z m 0 0" fill="#222222"/></svg>
diff --git a/tests/header/__init__.py b/tests/header/__init__.py
new file mode 100644
index 0000000..d645978
--- /dev/null
+++ b/tests/header/__init__.py
@@ -0,0 +1,2 @@
+# Copyright 2023 (c) Anna Schumaker.
+"""Needed to fix the unique basename problem with pytest."""
diff --git a/tests/header/test_header.py b/tests/header/test_header.py
index fc57a6f..dbd6d6e 100644
--- a/tests/header/test_header.py
+++ b/tests/header/test_header.py
@@ -2,6 +2,7 @@
 """Tests our application header."""
 import emmental
 import tests.util
+import unittest.mock
 from gi.repository import Gtk
 from gi.repository import Adw
 
@@ -30,3 +31,18 @@ class TestHeader(tests.util.TestCase):
         self.assertEqual(self.header.subtitle, emmental.header.SUBTITLE)
         self.assertEqual(self.header._title.get_subtitle(),
                          emmental.header.SUBTITLE)
+
+    def test_settings(self):
+        """Check that the Settings window is set up correctly."""
+        self.assertIsInstance(self.header._settings, Gtk.Button)
+        self.assertIsInstance(self.header._window,
+                              emmental.header.settings.Window)
+
+        self.assertEqual(self.header.sql, self.sql)
+        self.assertEqual(self.header._settings.get_icon_name(),
+                         "settings-symbolic")
+
+        with unittest.mock.patch.object(self.header._window,
+                                        "present") as mock_present:
+            self.header._settings.emit("clicked")
+            mock_present.assert_called()
diff --git a/tests/header/test_settings.py b/tests/header/test_settings.py
new file mode 100644
index 0000000..d910dc0
--- /dev/null
+++ b/tests/header/test_settings.py
@@ -0,0 +1,143 @@
+# Copyright 2022 (c) Anna Schumaker.
+"""Tests our Settings dialog."""
+import unittest.mock
+import emmental.header.settings
+import emmental.entry
+import tests.util
+from gi.repository import Gtk
+from gi.repository import Adw
+
+
+class TestValueRow(tests.util.TestCase):
+    """Test the settings Value Row."""
+
+    def setUp(self):
+        """Set up common variables."""
+        super().setUp()
+        self.listitem = Gtk.ListItem()
+        self.row = emmental.header.settings.ValueRow(self.listitem)
+
+    def make_setting(self, name: str, type: str, value: any) -> None:
+        """Create a setting in the database."""
+        setting = self.sql.settings.create(name, type, value)
+        self.listitem.get_item = unittest.mock.Mock(return_value=setting)
+
+    def test_init(self):
+        """Tetst that the ValueRow is configured correctly."""
+        self.assertIsInstance(self.row, emmental.factory.ListRow)
+        self.assertIsNone(self.row.child)
+
+    def test_boolean_setting(self):
+        """Test configuring the row for a boolean setting."""
+        self.make_setting("test.bool", "gboolean", True)
+
+        self.row.bind()
+        self.assertIsInstance(self.row.child, Gtk.Switch)
+        self.assertEqual(self.row.child.get_halign(), Gtk.Align.START)
+        self.assertTrue(self.row.child.get_active())
+
+    def test_string_setting(self):
+        """Test configuring the row for a string setting."""
+        self.make_setting("test.string", "gchararray", "Test Text")
+
+        self.row.bind()
+        self.assertIsInstance(self.row.child, emmental.entry.String)
+        self.assertFalse(self.row.child.get_has_frame())
+        self.assertEqual(self.row.child.value, "Test Text")
+
+    def test_integer_setting(self):
+        """Test configuring the row for an integer setting."""
+        self.make_setting("test.int", "gint", 42)
+
+        self.row.bind()
+        self.assertIsInstance(self.row.child, emmental.entry.Integer)
+        self.assertFalse(self.row.child.get_has_frame())
+        self.assertEqual(self.row.child.value, 42)
+
+    def test_float_setting(self):
+        """Test configuring the row for a float setting."""
+        self.make_setting("test.float", "gdouble", 1.234)
+
+        self.row.bind()
+        self.assertIsInstance(self.row.child, emmental.entry.Float)
+        self.assertFalse(self.row.child.get_has_frame())
+        self.assertEqual(self.row.child.value, 1.234)
+
+
+class TestWindow(tests.util.TestCase):
+    """Test the Settings Window."""
+
+    def setUp(self):
+        """Set up common variables."""
+        super().setUp()
+        self.window = emmental.header.settings.Window(sql=self.sql)
+
+    def test_init(self):
+        """Test that the Settings Window is configured properly."""
+        self.assertIsInstance(self.window, Adw.Window)
+        self.assertEqual(self.window.get_default_size(), (500, 500))
+        self.assertEqual(self.window.get_title(), "Emmental Settings")
+        self.assertEqual(self.window.get_icon_name(), "settings")
+        self.assertTrue(self.window.get_hide_on_close())
+        self.assertTrue(self.window.has_css_class("devel"))
+
+    def test_content(self):
+        """Test that the Window content was set up properly."""
+        box = self.window.get_content()
+        self.assertIsInstance(box, Gtk.Box)
+        self.assertEqual(box.get_orientation(), Gtk.Orientation.VERTICAL)
+        self.assertEqual(box.get_spacing(), 0)
+
+    def test_headerbar(self):
+        """Test that the Window headerbar was set up properly."""
+        self.assertIsInstance(self.window._header, Gtk.HeaderBar)
+        self.assertEqual(self.window.get_content().get_first_child(),
+                         self.window._header)
+
+    def test_search(self):
+        """Test the search entry widget."""
+        self.assertIsInstance(self.window._search, emmental.entry.Filter)
+        self.assertEqual(self.window._search.get_placeholder_text(),
+                         "type to filter settings")
+        self.assertEqual(self.window._header.get_title_widget(),
+                         self.window._search)
+
+        self.window._search.set_text("abcde")
+        with unittest.mock.patch.object(self.sql.settings,
+                                        "filter") as mock_filter:
+            self.window._search.emit("search-changed")
+            mock_filter.assert_called_with("*abcde*")
+
+    def test_columnview(self):
+        """Test the columnview widget."""
+        self.assertIsInstance(self.window._scroll, Gtk.ScrolledWindow)
+        self.assertIsInstance(self.window._selection, Gtk.NoSelection)
+        self.assertIsInstance(self.window._view, Gtk.ColumnView)
+
+        self.assertEqual(self.window._scroll.get_policy(),
+                         (Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC))
+
+        self.assertEqual(self.window._view.get_model(), self.window._selection)
+        self.assertEqual(self.window._selection.get_model(), self.sql.settings)
+        self.assertTrue(self.window._view.get_show_row_separators())
+
+        self.assertEqual(self.window._header.get_next_sibling(),
+                         self.window._scroll)
+        self.assertEqual(self.window._scroll.get_child(), self.window._view)
+
+    def test_columns(self):
+        """Test the view's columns."""
+        columns = self.window._view.get_columns()
+        self.assertEqual(len(columns), 2)
+
+        self.assertIsInstance(columns[0].get_factory(),
+                              emmental.factory.InscriptionFactory)
+        self.assertEqual(columns[0].get_title(), "Key")
+        self.assertEqual(columns[0].get_fixed_width(), 400)
+
+        self.assertIsInstance(columns[1].get_factory(),
+                              emmental.factory.Factory)
+        self.assertEqual(columns[1].get_factory().row_type,
+                         emmental.header.settings.ValueRow)
+        self.assertEqual(columns[1].get_title(), "Value")
+        self.assertEqual(columns[1].get_fixed_width(), 100)