diff --git a/src/wuttjamaican/app.py b/src/wuttjamaican/app.py
index 69ba3a9..fd287fb 100644
--- a/src/wuttjamaican/app.py
+++ b/src/wuttjamaican/app.py
@@ -676,7 +676,20 @@ class AppHandler:
     # common value renderers
     ##############################
 
-    def render_currency(self, value, scale=2, **kwargs):
+    def render_boolean(self, value):
+        """
+        Render a boolean value for display.
+
+        :param value: A boolean, or ``None``.
+
+        :returns: Display string for the value.
+        """
+        if value is None:
+            return ''
+
+        return "Yes" if value else "No"
+
+    def render_currency(self, value, scale=2):
         """
         Return a human-friendly display string for the given currency
         value, e.g. ``Decimal('4.20')`` becomes ``"$4.20"``.
@@ -749,6 +762,28 @@ class AppHandler:
         """
         return simple_error(error)
 
+    def render_quantity(self, value, empty_zero=False):
+        """
+        Return a human-friendly display string for the given quantity
+        value, e.g. ``1.000`` becomes ``"1"``.
+
+        :param value: The quantity to be rendered.
+
+        :param empty_zero: Affects the display when value equals zero.
+           If false (the default), will return ``'0'``; if true then
+           it returns empty string.
+
+        :returns: Display string for the quantity.
+        """
+        if value is None:
+            return ''
+        if int(value) == value:
+            value = int(value)
+            if empty_zero and value == 0:
+                return ''
+            return str(value)
+        return str(value).rstrip('0')
+
     def render_time_ago(self, value):
         """
         Return a human-friendly string, indicating how long ago
diff --git a/tests/test_app.py b/tests/test_app.py
index 7168164..bc909bf 100644
--- a/tests/test_app.py
+++ b/tests/test_app.py
@@ -423,6 +423,17 @@ app_title = WuttaTest
         session = self.app.get_session(user)
         self.assertIs(session, mysession)
 
+    def test_render_boolean(self):
+
+        # null
+        self.assertEqual(self.app.render_boolean(None), "")
+
+        # true
+        self.assertEqual(self.app.render_boolean(True), "Yes")
+
+        # false
+        self.assertEqual(self.app.render_boolean(False), "No")
+
     def test_render_currency(self):
 
         # null
@@ -460,7 +471,7 @@ app_title = WuttaTest
         dt = datetime.datetime(2024, 12, 11, 8, 30, tzinfo=datetime.timezone.utc)
         self.assertEqual(self.app.render_datetime(dt), '2024-12-11 08:30+0000')
 
-    def test_simple_error(self):
+    def test_render_error(self):
 
         # with description
         try:
@@ -476,6 +487,23 @@ app_title = WuttaTest
             result = self.app.render_error(error)
         self.assertEqual(result, "RuntimeError")
 
+    def test_render_quantity(self):
+
+        # null
+        self.assertEqual(self.app.render_quantity(None), "")
+
+        # integer decimals become integers
+        value = decimal.Decimal('1.000')
+        self.assertEqual(self.app.render_quantity(value), "1")
+
+        # but decimal places are preserved
+        value = decimal.Decimal('1.234')
+        self.assertEqual(self.app.render_quantity(value), "1.234")
+
+        # zero can be empty string
+        self.assertEqual(self.app.render_quantity(0), "0")
+        self.assertEqual(self.app.render_quantity(0, empty_zero=True), "")
+
     def test_render_time_ago(self):
         with patch.object(mod, 'humanize') as humanize:
             humanize.naturaltime.return_value = 'now'