diff --git a/android/app/src/main/res/drawable/widget_frame.xml b/android/app/src/main/res/drawable/widget_frame.xml
new file mode 100644
index 00000000..1e0d98a9
--- /dev/null
+++ b/android/app/src/main/res/drawable/widget_frame.xml
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Home-screen widget edge, drawn over the widget by layout/rn_widget.xml. -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <stroke
+        android:width="1dp"
+        android:color="@color/widget_frame" />
+    <corners android:radius="@dimen/widget_radius" />
+</shape>
diff --git a/android/app/src/main/res/drawable/widget_surface.xml b/android/app/src/main/res/drawable/widget_surface.xml
new file mode 100644
index 00000000..730f8463
--- /dev/null
+++ b/android/app/src/main/res/drawable/widget_surface.xml
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Home-screen widget root (layout/rn_widget.xml): its rounded outline is what the widget clips to. -->
+<shape xmlns:android="http://schemas.android.com/apk/res/android"
+    android:shape="rectangle">
+    <solid android:color="@color/widget_surface" />
+    <corners android:radius="@dimen/widget_radius" />
+</shape>
diff --git a/android/app/src/main/res/layout-night/rn_widget.xml b/android/app/src/main/res/layout-night/rn_widget.xml
new file mode 100644
index 00000000..0eb7803b
--- /dev/null
+++ b/android/app/src/main/res/layout-night/rn_widget.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Night twin of layout/rn_widget.xml, which explains the override. -->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@android:id/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@drawable/widget_surface"
+    android:clipToOutline="true"
+    android:foreground="@drawable/widget_frame"
+    tools:targetApi="31">
+
+    <ImageView
+        android:id="@+id/rn_widget_image_light"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/transparent"
+        android:scaleType="matrix"
+        android:visibility="gone" />
+
+    <ImageView
+        android:id="@+id/rn_widget_image_dark"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/transparent"
+        android:scaleType="matrix"
+        android:visibility="visible" />
+
+    <FrameLayout
+        android:id="@+id/rn_widget_clickable_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <FrameLayout
+        android:id="@+id/rn_widget_collection_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</FrameLayout>
diff --git a/android/app/src/main/res/layout/rn_widget.xml b/android/app/src/main/res/layout/rn_widget.xml
new file mode 100644
index 00000000..2d50ffec
--- /dev/null
+++ b/android/app/src/main/res/layout/rn_widget.xml
@@ -0,0 +1,50 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  Overrides react-native-android-widget's rn_widget.xml (same ids and children;
+  layout-night/rn_widget.xml is its night twin).
+
+  The library draws each widget into one bitmap sized from the size the
+  launcher reports, and pins it to the top left without scaling. When the real
+  frame is smaller (after a rotation, or on a launcher that over-reports), the
+  bitmap's bottom edge is cut off and takes the rounded corners and the border
+  with it, so the bottom corners fall back to whatever the launcher clips to.
+  This root always has the real size, so it owns the shape instead: it clips to
+  a rounded outline (Android 12+; the launcher then leaves the corners to us),
+  fills in where the bitmap falls short, and draws the frame on top.
+-->
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@android:id/background"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:background="@drawable/widget_surface"
+    android:clipToOutline="true"
+    android:foreground="@drawable/widget_frame"
+    tools:targetApi="31">
+
+    <ImageView
+        android:id="@+id/rn_widget_image_light"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/transparent"
+        android:scaleType="matrix"
+        android:visibility="visible" />
+
+    <ImageView
+        android:id="@+id/rn_widget_image_dark"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@android:color/transparent"
+        android:scaleType="matrix"
+        android:visibility="gone" />
+
+    <FrameLayout
+        android:id="@+id/rn_widget_clickable_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <FrameLayout
+        android:id="@+id/rn_widget_collection_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+</FrameLayout>
diff --git a/android/app/src/main/res/values-night/colors.xml b/android/app/src/main/res/values-night/colors.xml
index 8c8b16ea..32088aa9 100644
--- a/android/app/src/main/res/values-night/colors.xml
+++ b/android/app/src/main/res/values-night/colors.xml
@@ -3,4 +3,6 @@
   <color name="splashscreen_background">#09090b</color>
   <!-- Matches the dark palette background (src/theme/tokens.ts). -->
   <color name="window_background">#09090b</color>
+  <!-- DARK.bg in src/widgets/theme.ts. -->
+  <color name="widget_surface">#0a0a0a</color>
 </resources>
\ No newline at end of file
diff --git a/android/app/src/main/res/values/colors.xml b/android/app/src/main/res/values/colors.xml
index a8383caf..ee512c47 100644
--- a/android/app/src/main/res/values/colors.xml
+++ b/android/app/src/main/res/values/colors.xml
@@ -6,4 +6,8 @@
   <color name="colorPrimaryDark">#09090b</color>
   <!-- Behind the React root until the first frame; matches the light palette background (src/theme/tokens.ts). -->
   <color name="window_background">#ffffff</color>
+  <!-- Home-screen widget surface (LIGHT.bg in src/widgets/theme.ts); it only shows where the drawn widget falls short of the launcher's frame. -->
+  <color name="widget_surface">#ffffff</color>
+  <!-- Home-screen widget edge, one colour for both schemes: the app can force a theme the launcher's night mode doesn't know about. -->
+  <color name="widget_frame">#4d808080</color>
 </resources>
\ No newline at end of file
diff --git a/android/app/src/main/res/values/dimens.xml b/android/app/src/main/res/values/dimens.xml
new file mode 100644
index 00000000..44ea3ed1
--- /dev/null
+++ b/android/app/src/main/res/values/dimens.xml
@@ -0,0 +1,4 @@
+<resources>
+  <!-- Home-screen widget corners; WIDGET_RADIUS in src/widgets/primitives.tsx. -->
+  <dimen name="widget_radius">22dp</dimen>
+</resources>
diff --git a/src/widgets/layouts/calendar.tsx b/src/widgets/layouts/calendar.tsx
index ced4a0fe..171a4437 100644
--- a/src/widgets/layouts/calendar.tsx
+++ b/src/widgets/layouts/calendar.tsx
@@ -29,8 +29,6 @@ import type { EventItem, WidgetSnapshot } from '../snapshot';
 import { chipBackground, normalizeHex, type WidgetPalette } from '../theme';
 import type { Layout } from './types';
 
-/** Surface's 1dp frame; Android adds a border to the padding, so it eats space. */
-const FRAME = 1;
 const HOUR = 3600000;
 const GRID_START_HOUR = 8;
 const GRID_END_HOUR = 18;
@@ -207,7 +205,7 @@ export const AgendaLayout: Layout = ({ s, p, f, now, height }) => {
     );
   }
   // Header bar plus its 1dp rule.
-  const room = height - 2 * FRAME - headerHeight - 1;
+  const room = height - headerHeight - 1;
   const { sections, hidden } = planAgenda(days, room);
   const rows: React.JSX.Element[] = [];
   sections.forEach((day, d) => {
@@ -366,12 +364,12 @@ export const WeekLayout: Layout = ({ s, p, f, now, width, height }) => {
   const events = s.calendar.events;
   const first = startOfWeek(now, s.weekStart);
   const days = Array.from({ length: 7 }, (_, i) => addDays(first, i));
-  const colWidth = (width - 2 * FRAME - 2 * WEEK_PAD) / 7;
+  const colWidth = (width - 2 * WEEK_PAD) / 7;
   const segments = allDaySegments(events, days);
   const strip = segments.some((seg) => seg.event !== null);
   const gridHeight = Math.max(
     0,
-    height - 2 * FRAME - WEEK_PAD - WEEK_LABEL_HEIGHT - 2 - WEEK_DAY_SIZE - WEEK_GAP
+    height - WEEK_PAD - WEEK_LABEL_HEIGHT - 2 - WEEK_DAY_SIZE - WEEK_GAP
       - (strip ? WEEK_STRIP_HEIGHT + WEEK_GAP : 0) - 1,
   );
   const windowStart = startOfDay(now) + GRID_START_HOUR * HOUR;
@@ -566,11 +564,11 @@ export const MonthLayout: Layout = ({ s, p, f, now, width, height }) => {
   const weeks = monthGrid(s.calendar.events, now, s.weekStart);
   const next = upcoming(s.calendar.events, now);
   const headerHeight = height >= 340 ? 44 : 38;
-  const cellWidth = (width - 2 * FRAME - 2 * MONTH_PAD) / 7;
+  const cellWidth = (width - 2 * MONTH_PAD) / 7;
   const chipsHeight = (n: number) =>
     n === 0 ? 0 : MONTH_CHIPS_TOP + n * MONTH_CHIP_HEIGHT + (n - 1) * 4 + MONTH_CHIPS_BOTTOM;
   const gridRoom = (n: number) =>
-    height - 2 * FRAME - headerHeight - MONTH_LABEL_HEIGHT - MONTH_GRID_TOP - chipsHeight(n);
+    height - headerHeight - MONTH_LABEL_HEIGHT - MONTH_GRID_TOP - chipsHeight(n);
   // Two chips when the weeks still get a comfortable row, else one, else none.
   let chips = Math.min(2, next.length);
   while (chips > 0 && gridRoom(chips) / weeks.length < MONTH_CELL_MIN) chips -= 1;
@@ -700,7 +698,7 @@ function TodayColumn({
   const tomorrowList = eventsOnDay(events, addDays(today, 1));
 
   // The "N more this week" line is always reserved; chips share the rest.
-  const room = height - 2 * FRAME - 2 * TODAY_PAD - TODAY_LINE;
+  const room = height - 2 * TODAY_PAD - TODAY_LINE;
   const row = TODAY_CHIP + TODAY_GAP;
   let withTomorrow = tomorrowList.length > 0;
   let slots = Math.floor((room - (withTomorrow ? TOMORROW_BLOCK : 0) + TODAY_GAP) / row);
@@ -792,7 +790,7 @@ function TodayColumn({
 export const TodayEventsLayout: Layout = ({ s, p, f, now, height }) => {
   // The date block is ~108dp tall at 40sp; a short 4x2 gets a smaller number
   // and, if still tight, loses the month line.
-  const room = height - 2 * FRAME - 2 * TODAY_PAD;
+  const room = height - 2 * TODAY_PAD;
   const big = room >= 108 ? 40 : 32;
   const showMonth = room >= 3 * 18 + Math.ceil(big * 1.33);
   return (
@@ -820,7 +818,7 @@ export const NextEventLayout: Layout = ({ s, p, f, now, height }) => {
   const when = running ? f.t('widgets.calendar.now', 'Now') : capitalize(f.relative(e.start, now), f.locale);
   // Status line, gap, one title line and the time range always show; then the
   // place, the calendar and a second title line, as long as they fit.
-  const room = height - 2 * FRAME - 28;
+  const room = height - 28;
   let used = 16 + 6 + 22 + 18;
   const place = placeOf(f, e);
   const showPlace = !!place && used + 16 <= room;
@@ -888,7 +886,7 @@ function TwoLineChip({ f, e, now }: { f: Fmt; e: EventItem; now: number }) {
 }
 
 export const DateNextLayout: Layout = ({ s, p, f, now, height }) => {
-  const room = height - 2 * FRAME - 2 * DATE_PAD - DATE_CIRCLE - 8;
+  const room = height - 2 * DATE_PAD - DATE_CIRCLE - 8;
   const count = room >= 2 * DATE_CHIP + 4 ? 2 : 1;
   const next = s.calendar.supported ? upcoming(s.calendar.events, now).slice(0, count) : [];
   const chips: React.JSX.Element[] = [];
diff --git a/src/widgets/layouts/hubs.tsx b/src/widgets/layouts/hubs.tsx
index 71bc13be..955e2638 100644
--- a/src/widgets/layouts/hubs.tsx
+++ b/src/widgets/layouts/hubs.tsx
@@ -306,8 +306,8 @@ export const MailAndNextLayout: Layout = ({ s, p, f, now, height }) => {
           height: 'match_parent',
           padding: pad,
           backgroundColor: unread > 0 ? p.unreadRow : p.bg,
-          borderTopLeftRadius: WIDGET_RADIUS - 1,
-          borderBottomLeftRadius: WIDGET_RADIUS - 1,
+          borderTopLeftRadius: WIDGET_RADIUS,
+          borderBottomLeftRadius: WIDGET_RADIUS,
         }}
       >
         <FlexWidget style={{ flexDirection: 'row', alignItems: 'center' }}>
diff --git a/src/widgets/primitives.tsx b/src/widgets/primitives.tsx
index 0c22f23d..dce01a75 100644
--- a/src/widgets/primitives.tsx
+++ b/src/widgets/primitives.tsx
@@ -17,9 +17,14 @@ import { chipBackground, normalizeHex, type WidgetPalette } from './theme';
 import { filledIcon, icon, type FilledIconName, type IconName } from './icons';
 import type { WidgetClick } from './clicks';
 
-/** Corner radius of the widget surface; launchers clip to roughly this on Android 12+. */
+/** Corner radius of the widget surface; `widget_radius` in android/app/src/main/res/values/dimens.xml. */
 export const WIDGET_RADIUS = 22;
 
+/**
+ * The widget's background. Its edge and the clip to rounded corners come from
+ * the root layout (android/app/src/main/res/layout/rn_widget.xml), which has the
+ * launcher's real size; this bitmap is drawn at the reported one and can be cut off.
+ */
 export function Surface({
   p,
   children,
@@ -39,8 +44,6 @@ export function Surface({
         width: 'match_parent',
         backgroundColor: p.bg,
         borderRadius: WIDGET_RADIUS,
-        borderWidth: 1,
-        borderColor: p.frame,
         overflow: 'hidden',
         ...style,
       }}
diff --git a/src/widgets/theme.ts b/src/widgets/theme.ts
index 3eabe612..cbaa1f08 100644
--- a/src/widgets/theme.ts
+++ b/src/widgets/theme.ts
@@ -10,15 +10,16 @@ export type WidgetScheme = 'light' | 'dark';
 
 export interface WidgetPalette {
   scheme: WidgetScheme;
-  /** Widget surface (webmail `--color-background`). */
+  /**
+   * Widget surface (webmail `--color-background`). The edge around it is drawn
+   * natively, as `widget_frame` in android/app/src/main/res/values/colors.xml.
+   */
   bg: ColorProp;
   fg: ColorProp;
   muted: ColorProp;
   /** Search pill, segmented track, quota ring track (webmail `--color-muted`). */
   mutedBg: ColorProp;
   border: ColorProp;
-  /** Outer widget edge. */
-  frame: ColorProp;
   primary: ColorProp;
   primaryFg: ColorProp;
   accent: ColorProp;
@@ -66,7 +67,6 @@ export const LIGHT: WidgetPalette = {
   muted: '#64748b',
   mutedBg: '#f1f5f9',
   border: '#e2e8f0',
-  frame: '#e2e8f0',
   primary: '#3b82f6',
   primaryFg: '#ffffff',
   accent: '#dbeafe',
@@ -108,7 +108,6 @@ export const DARK: WidgetPalette = {
   muted: '#a3a3a3',
   mutedBg: '#262626',
   border: '#2d2d2d',
-  frame: 'rgba(128, 128, 128, 0.3)',
   primary: '#fafafa',
   primaryFg: '#171717',
   accent: '#1e3a8a',