diff --git a/apps/p2/plugins/chat/web.tsx b/apps/p2/plugins/chat/web.tsx
index fd29a535a..53a7556b4 100644
--- a/apps/p2/plugins/chat/web.tsx
+++ b/apps/p2/plugins/chat/web.tsx
@@ -408,12 +408,24 @@ function Composer({
 				{children}
 				<span className="spacer" />
 				{busy && onStop && (
-					<button type="button" className="round stop" aria-label="Stop" onClick={onStop}>
+					<button
+						type="button"
+						className="round stop"
+						aria-label="Stop"
+						onPointerDown={keepComposerFocus}
+						onClick={onStop}
+					>
 						<StopIcon />
 					</button>
 				)}
 				{(!busy || content) && (
-					<button type="submit" className="round send" aria-label="Send" disabled={!content || disabled}>
+					<button
+						type="submit"
+						className="round send"
+						aria-label="Send"
+						disabled={!content || disabled}
+						onPointerDown={keepComposerFocus}
+					>
 						<SendIcon />
 					</button>
 				)}
@@ -422,6 +434,15 @@ function Composer({
 	);
 }
 
+/**
+ * Keeps the focus in the composer's textarea when Send or Stop is pressed. Without this the press blurs the textarea, a
+ * phone's keyboard closes, the page shrinks back and the button moves out from under the finger before the click: the
+ * first tap only closed the keyboard. The click still fires; the keyboard stays open for the next message.
+ */
+function keepComposerFocus(event: React.PointerEvent<HTMLButtonElement>): void {
+	event.preventDefault();
+}
+
 /** The composer's settings from the screen in the frame; the frame owns its textarea (`Frame.composer`). */
 type ComposerProps = Omit<Parameters<typeof Composer>[0], "textareaRef">;
 
diff --git a/apps/p2/test/p2/ui-mobile-fixes.test.ts b/apps/p2/test/p2/ui-mobile-fixes.test.ts
index f0a7ee446..cfc7f2859 100644
--- a/apps/p2/test/p2/ui-mobile-fixes.test.ts
+++ b/apps/p2/test/p2/ui-mobile-fixes.test.ts
@@ -433,4 +433,36 @@ describe("Pi Mobile audit fixes in the browser", { skip: !browserTests }, () =>
 		);
 		hosts.release();
 	});
+
+	it("sends with one tap on Send: the press keeps the composer focused, so a phone's keyboard does not close first", async () => {
+		const session = await (await holdIn(owner, Sessions, {}, "owner")).create(
+			{ cwd: fixture.workspace, title: "Tap send" },
+			BACKGROUND_CONTEXT,
+		);
+		const chat = await holdIn(owner, Chat, { session: session.id, conversation: 1 }, "participant");
+		const stop = follow(chat.view, () => {});
+		try {
+			await browser.metrics(390, 844);
+			await browser.open(url(`/s/${session.id}`));
+			await browser.wait(`document.querySelector('.composer textarea') && !document.querySelector('.offline')`);
+			await browser.evaluate(`document.querySelector('.composer textarea').focus()`);
+			await browser.call("Input.insertText", { text: "tap send" });
+			await browser.wait(`!document.querySelector('.composer .send').disabled`);
+			const [x, y] = await browser.evaluate<[number, number]>(
+				`(() => { const r = document.querySelector('.composer .send').getBoundingClientRect(); return [r.x + r.width / 2, r.y + r.height / 2]; })()`,
+			);
+			// Pressing Send leaves the focus in the textarea (blurring it would close a phone's keyboard and move the button).
+			await browser.call("Input.dispatchMouseEvent", { type: "mousePressed", x, y, button: "left", clickCount: 1 });
+			assert.equal(
+				await browser.evaluate<boolean>(`document.activeElement === document.querySelector('.composer textarea')`),
+				true,
+			);
+			// Releasing it sends: one tap, no second press.
+			await browser.call("Input.dispatchMouseEvent", { type: "mouseReleased", x, y, button: "left", clickCount: 1 });
+			await until(chat.view, answered("Echo: tap send"), 30_000);
+		} finally {
+			stop();
+			chat.release();
+		}
+	});
 });