diff --git a/admin/src/features/configuration/ProtectionGroups.tsx b/admin/src/features/configuration/ProtectionGroups.tsx
index 1a41433..32c1f4e 100644
--- a/admin/src/features/configuration/ProtectionGroups.tsx
+++ b/admin/src/features/configuration/ProtectionGroups.tsx
@@ -18,10 +18,10 @@ import {
 	rulesQuery,
 } from "@/lib/queries";
 import type { Blocklist, ConfigStatus, Group, Rule, RuleAction, RuleKind } from "@/lib/types";
-import Checkbox from "@/ui/Checkbox";
 import ConfirmDialog from "@/ui/ConfirmDialog";
 import DefinitionList from "@/ui/DefinitionList";
 import Select from "@/ui/Select";
+import Switch from "@/ui/Switch";
 import { styles as shared } from "@/ui/styles";
 import { colors } from "@/ui/tokens.stylex";
 import AuthorityGate from "./AuthorityGate";
@@ -349,7 +349,7 @@ function GroupDetailEditable({ group }: { group: Group }) {
 			)}
 
 			<div {...stylex.props(styles.controlRow)}>
-				<Checkbox
+				<Switch
 					isSelected={group.safe_search}
 					isDisabled={update.isPending}
 					onChange={(safeSearch) =>
@@ -357,7 +357,7 @@ function GroupDetailEditable({ group }: { group: Group }) {
 					}
 				>
 					Safe search
-				</Checkbox>
+				</Switch>
 				<span {...stylex.props(styles.spacer)}>
 					{!renaming && (
 						<button
diff --git a/admin/src/features/configuration/ProtectionPage.test.tsx b/admin/src/features/configuration/ProtectionPage.test.tsx
index 4b3e24d..83df699 100644
--- a/admin/src/features/configuration/ProtectionPage.test.tsx
+++ b/admin/src/features/configuration/ProtectionPage.test.tsx
@@ -46,7 +46,7 @@ test("another group can be renamed and deleted, and carries its safe-search stat
 	await screen.findByRole("heading", { name: "kids", level: 2 });
 
 	expect((screen.getByRole("button", { name: "Rename group" }) as HTMLButtonElement).disabled).toBe(false);
-	expect((screen.getByRole("checkbox", { name: "Safe search" }) as HTMLInputElement).checked).toBe(true);
+	expect((screen.getByRole("switch", { name: "Safe search" }) as HTMLInputElement).checked).toBe(true);
 
 	fireEvent.click(screen.getByRole("button", { name: "Delete group" }));
 	const dialog = await screen.findByRole("alertdialog");
@@ -60,7 +60,7 @@ test("toggling safe search resends the whole group row", async () => {
 	await openProtection(2);
 	await screen.findByRole("heading", { name: "kids", level: 2 });
 
-	fireEvent.click(screen.getByRole("checkbox", { name: "Safe search" }));
+	fireEvent.click(screen.getByRole("switch", { name: "Safe search" }));
 
 	await waitFor(() => expect(writes("PUT")).toHaveLength(1));
 	expect(writes("PUT")[0]).toMatchObject({
@@ -98,8 +98,10 @@ test("the source checkboxes form one named group, and each carries its own state
 	const group = await screen.findByRole("group", { name: "Assigned sources" });
 	const ads = within(group).getByRole("checkbox", { name: "Ads" }) as HTMLInputElement;
 	expect(ads.checked).toBe(false);
-	// Safe search is the group's own field, not one of its sources.
-	expect(within(group).queryByRole("checkbox", { name: "Safe search" })).toBeNull();
+	// Safe search is the group's own field, not one of its sources, and it is a
+	// switch rather than a checkbox because it applies the moment it moves.
+	expect(within(group).queryByRole("switch")).toBeNull();
+	expect(screen.getByRole("switch", { name: "Safe search" })).toBeTruthy();
 
 	fireEvent.click(ads);
 	await waitFor(() => expect(ads.checked).toBe(true));
@@ -235,11 +237,33 @@ test("the Sources tab lists the catalogue with both skipped columns and their no
 	expect(
 		screen.getByText(/Skipped unsupported lines are syntax nxdns cannot translate into a DNS decision/),
 	).toBeTruthy();
-	expect((screen.getByLabelText("Ads enabled") as HTMLInputElement).checked).toBe(true);
-	expect((screen.getByLabelText("Trackers enabled") as HTMLInputElement).checked).toBe(false);
+	// Switches, not checkboxes: the row applies the moment it moves, and the role
+	// is what tells a screen reader so.
+	expect((screen.getByRole("switch", { name: "Ads enabled" }) as HTMLInputElement).checked).toBe(true);
+	expect((screen.getByRole("switch", { name: "Trackers enabled" }) as HTMLInputElement).checked).toBe(false);
 	expect(screen.getByRole("heading", { name: "Add source" })).toBeTruthy();
 });
 
+test("a source switch resends the whole row immediately, with no Save step", async () => {
+	calls = stubApi(DATABASE);
+	await renderPage("/configuration/protection?tab=sources", "Protection");
+
+	fireEvent.click(await screen.findByRole("switch", { name: "Trackers enabled" }));
+
+	// No Save button stands between the switch and the write: one click, one PUT.
+	await waitFor(() => expect(writes("PUT")).toHaveLength(1));
+	expect(writes("PUT")[0]).toMatchObject({
+		url: "/api/blocklists/2",
+		// The whole row goes back, not a patch of the one field that moved.
+		body: {
+			url: "https://example.com/trackers.txt",
+			name: "Trackers",
+			enabled: true,
+			is_suggested: true,
+		},
+	});
+});
+
 test("Update now says it started, and says nothing once it succeeds", async () => {
 	let release: ((response: Response) => void) | null = null;
 	calls = stubApi(DATABASE, {
diff --git a/admin/src/features/configuration/ProtectionSources.tsx b/admin/src/features/configuration/ProtectionSources.tsx
index 21a17d3..83c28e0 100644
--- a/admin/src/features/configuration/ProtectionSources.tsx
+++ b/admin/src/features/configuration/ProtectionSources.tsx
@@ -14,6 +14,7 @@ import type { Blocklist, BlocklistInput } from "@/lib/types";
 import ConfirmDialog from "@/ui/ConfirmDialog";
 import { styles as shared } from "@/ui/styles";
 import { colors } from "@/ui/tokens.stylex";
+import Switch from "@/ui/Switch";
 import AuthorityGate from "./AuthorityGate";
 import BlocklistForm from "./BlocklistForm";
 import FileModeNote from "./FileModeNote";
@@ -249,13 +250,11 @@ function SourcesEditor({ blocklists }: { blocklists: Blocklist[] }) {
 										</span>
 									</td>
 									<td {...stylex.props(shared.td)}>
-										<input
-											type="checkbox"
+										<Switch
 											aria-label={`${b.name} enabled`}
-											checked={b.enabled}
-											disabled={toggle.isPending}
+											isSelected={b.enabled}
+											isDisabled={toggle.isPending}
 											onChange={() => toggleEnabled(b)}
-											{...stylex.props(shared.focusRing)}
 										/>
 									</td>
 									<td {...stylex.props(shared.td, shared.tabularNums)}>{b.domain_count}</td>
diff --git a/admin/src/features/configuration/UpstreamsTab.tsx b/admin/src/features/configuration/UpstreamsTab.tsx
index 5328564..8dbd9d1 100644
--- a/admin/src/features/configuration/UpstreamsTab.tsx
+++ b/admin/src/features/configuration/UpstreamsTab.tsx
@@ -7,6 +7,7 @@ import type { Upstream, UpstreamInput } from "@/lib/types";
 import ConfirmDialog from "@/ui/ConfirmDialog";
 import { styles as shared } from "@/ui/styles";
 import { colors } from "@/ui/tokens.stylex";
+import Switch from "@/ui/Switch";
 import AuthorityGate from "./AuthorityGate";
 import FileModeNote from "./FileModeNote";
 import QueryPanel from "./QueryPanel";
@@ -165,13 +166,11 @@ function UpstreamsEditor({ upstreams }: { upstreams: Upstream[] }) {
 									</td>
 									<td {...stylex.props(shared.td, shared.tabularNums)}>{u.priority}</td>
 									<td {...stylex.props(shared.td)}>
-										<input
-											type="checkbox"
+										<Switch
 											aria-label={`${u.url} enabled`}
-											checked={u.enabled}
-											disabled={toggle.isPending}
+											isSelected={u.enabled}
+											isDisabled={toggle.isPending}
 											onChange={() => toggleEnabled(u)}
-											{...stylex.props(shared.focusRing)}
 										/>
 									</td>
 									<td {...stylex.props(shared.td)}>{u.tls_name === "" ? "—" : u.tls_name}</td>
diff --git a/admin/src/features/configuration/authority.test.tsx b/admin/src/features/configuration/authority.test.tsx
index 0306397..e34421c 100644
--- a/admin/src/features/configuration/authority.test.tsx
+++ b/admin/src/features/configuration/authority.test.tsx
@@ -24,7 +24,7 @@ afterEach(() => {
 function mutationControls(): Element[] {
 	return [
 		...contentArea().querySelectorAll(
-			'input, textarea, select, [role="combobox"], [role="checkbox"], [contenteditable]',
+			'input, textarea, select, [role="combobox"], [role="checkbox"], [role="switch"], [contenteditable]',
 		),
 	];
 }
diff --git a/admin/src/ui/Switch.test.tsx b/admin/src/ui/Switch.test.tsx
new file mode 100644
index 0000000..acdaf15
--- /dev/null
+++ b/admin/src/ui/Switch.test.tsx
@@ -0,0 +1,91 @@
+import { act, fireEvent, render, screen } from "@testing-library/react";
+import Switch from "./Switch";
+
+/**
+ * The drawn track, which is the label's one span that does not hold the hidden
+ * input. StyleX compiles to class names and jsdom loads no stylesheet, so the
+ * class list is the only place the composed state is observable.
+ */
+function track(input: HTMLElement): HTMLElement {
+	const label = input.closest("label") as HTMLElement;
+	const spans = [...label.querySelectorAll("span")];
+	const drawn = spans.find((span) => !span.contains(input));
+	if (drawn === undefined) throw new Error("the switch drew no track");
+	return drawn;
+}
+
+test("a switch reports the switch role, not a checkbox one", () => {
+	const onChange = vi.fn();
+	render(
+		<Switch isSelected onChange={onChange}>
+			Safe search
+		</Switch>,
+	);
+
+	// The role is the whole point: it tells a screen reader the setting moves now
+	// rather than on some later Save.
+	const control = screen.getByRole("switch", { name: "Safe search" }) as HTMLInputElement;
+	expect(control.checked).toBe(true);
+	expect(screen.queryByRole("checkbox")).toBeNull();
+
+	fireEvent.click(control);
+	// The caller owns the state, so the switch reports the value it would move to.
+	expect(onChange).toHaveBeenCalledWith(false);
+});
+
+test("a bare switch takes its name from aria-label", () => {
+	render(<Switch aria-label="udp://1.1.1.1:53 enabled" isSelected={false} onChange={vi.fn()} />);
+
+	const control = screen.getByRole("switch", { name: "udp://1.1.1.1:53 enabled" }) as HTMLInputElement;
+	expect(control.checked).toBe(false);
+});
+
+test("a disabled switch keeps its state on screen but takes no input", () => {
+	render(
+		<Switch isSelected isDisabled onChange={vi.fn()}>
+			Safe search
+		</Switch>,
+	);
+
+	const control = screen.getByRole("switch", { name: "Safe search" }) as HTMLInputElement;
+	expect(control.checked).toBe(true);
+	// The disabled input is the whole guard: a browser fires no click on one, and
+	// it is out of the tab order. Clicking it here would prove nothing either way,
+	// because `fireEvent` dispatches straight at the node and skips that check.
+	expect(control.disabled).toBe(true);
+});
+
+test("the track is drawn from the selected state, not left to the browser", () => {
+	const { rerender } = render(<Switch aria-label="Safe search" isSelected={false} onChange={vi.fn()} />);
+
+	const control = screen.getByRole("switch");
+	const off = track(control).className.split(" ");
+
+	rerender(<Switch aria-label="Safe search" isSelected onChange={vi.fn()} />);
+	const on = track(control).className.split(" ");
+
+	// The two states compose to different class sets, so the thumb and the fill
+	// actually move rather than the input alone changing.
+	expect(on).not.toEqual(off);
+});
+
+test("keyboard focus composes the ring onto the drawn track", () => {
+	render(<Switch aria-label="Safe search" isSelected={false} onChange={vi.fn()} />);
+
+	const control = screen.getByRole("switch");
+	const drawn = track(control);
+	const idle = drawn.className.split(" ");
+	expect(control.closest("label")?.getAttribute("data-focus-visible")).toBeNull();
+
+	// React Aria only calls focus visible after the modality is keyboard, which
+	// is why a bare focus() is not enough to raise the ring.
+	act(() => {
+		fireEvent.keyDown(document.body, { key: "Tab" });
+		control.focus();
+	});
+
+	expect(control.closest("label")?.getAttribute("data-focus-visible")).toBe("true");
+	const ringed = drawn.className.split(" ");
+	expect(ringed.length).toBeGreaterThan(idle.length);
+	expect(idle.every((name) => ringed.includes(name))).toBe(true);
+});
diff --git a/admin/src/ui/Switch.tsx b/admin/src/ui/Switch.tsx
new file mode 100644
index 0000000..ed2e3f9
--- /dev/null
+++ b/admin/src/ui/Switch.tsx
@@ -0,0 +1,121 @@
+/**
+ * The on/off switch, wrapping React Aria's.
+ *
+ * A switch, not a checkbox: every call site flips a setting that takes effect
+ * the moment it moves, with no Save between. A checkbox states what a form will
+ * submit, which is a promise these controls do not make.
+ *
+ * React Aria hides the real input and leaves the track to the call site, so the
+ * track and thumb below are what the reader sees. The caller always holds the
+ * state — none of these controls owns the value it shows, because the server's
+ * answer is the value.
+ */
+
+import type { ReactNode } from "react";
+import * as stylex from "@stylexjs/stylex";
+import { Switch as AriaSwitch } from "react-aria-components";
+import { colors } from "./tokens.stylex";
+
+interface Common {
+	isSelected: boolean;
+	onChange: (isSelected: boolean) => void;
+	/** Visible but inert; React Aria also drops it from the tab order. */
+	isDisabled?: boolean;
+}
+
+/** With visible words beside the track, which name it. */
+interface Labelled extends Common {
+	children: ReactNode;
+	"aria-label"?: never;
+}
+
+/** Bare, in a table cell whose column heading cannot name a single row. */
+interface Named extends Common {
+	children?: never;
+	"aria-label": string;
+}
+
+/**
+ * A switch has to be named, and exactly one of the two ways: visible words that
+ * `aria-label` would then override and hide from the reader who can see them,
+ * or no words and a label only the screen reader gets.
+ */
+type Props = Labelled | Named;
+
+const styles = stylex.create({
+	/**
+	 * The whole label is the hit area, so it carries the 44px pointer-target
+	 * floor on both axes, the same floor `Checkbox` and the dialog's Close
+	 * button already set. The track itself is far under it.
+	 */
+	label: {
+		minWidth: 44,
+		minHeight: 44,
+		display: "inline-flex",
+		alignItems: "center",
+		gap: "0.5rem",
+		fontSize: "0.875rem",
+		lineHeight: "1.25rem",
+	},
+	/** Bare switches sit in a table cell, where the row sets the rhythm. */
+	track: {
+		flexShrink: 0,
+		boxSizing: "border-box",
+		width: 28,
+		height: 16,
+		display: "inline-flex",
+		alignItems: "center",
+		justifyContent: "flex-start",
+		borderRadius: 8,
+		padding: 2,
+		backgroundColor: colors.borderStrong,
+	},
+	/**
+	 * The thumb moves by the box's own alignment rather than by a transform, so
+	 * there is no transition to withhold from a reader who asked for less motion.
+	 */
+	trackSelected: {
+		justifyContent: "flex-end",
+		backgroundColor: colors.primary,
+	},
+	/** As on `Checkbox`: the ring follows the state React Aria reports, because
+	 *  `:focus-visible` lands on the hidden input rather than on this track. */
+	trackFocused: {
+		outlineWidth: 2,
+		outlineStyle: "solid",
+		outlineColor: colors.focus,
+		outlineOffset: 2,
+	},
+	/** The track dims, not the words: the label still has to be readable. */
+	trackDisabled: {
+		opacity: 0.5,
+	},
+	thumb: {
+		width: 12,
+		height: 12,
+		borderRadius: 6,
+		backgroundColor: colors.surfaceRaised,
+	},
+});
+
+export default function Switch({ children, ...state }: Props) {
+	return (
+		<AriaSwitch {...state} className={() => stylex.props(styles.label).className ?? ""}>
+			{(renderProps) => (
+				<>
+					<span
+						{...stylex.props(
+							styles.track,
+							renderProps.isSelected && styles.trackSelected,
+							renderProps.isFocusVisible && styles.trackFocused,
+							renderProps.isDisabled && styles.trackDisabled,
+						)}
+					>
+						<span {...stylex.props(styles.thumb)} />
+					</span>
+					{children}
+				</>
+			)}
+		</AriaSwitch>
+	);
+}