diff --git a/README.md b/README.md
index e93a84a..efe462b 100644
--- a/README.md
+++ b/README.md
@@ -30,8 +30,6 @@ On iOS a few things behave differently, none of them fatal:
   you lose a strip of the screen to the toolbar, and iOS clears the saved
   settings of a site you haven't visited for a week. The installed app keeps
   its own storage and doesn't get pruned that way.
-- **There's no vibration** — iOS gives web pages no haptics at all, so the
-  turn-change buzz is silent there. The sounds still play.
 - **The ringer switch doesn't mute the clock.** The page claims a playback
   audio session so you can hear the delay tick with the phone silenced, which
   in exchange pauses any music you had going. If you'd rather keep the music,
diff --git a/public_html/index.html b/public_html/index.html
index fcb1381..5e510b3 100644
--- a/public_html/index.html
+++ b/public_html/index.html
@@ -673,7 +673,6 @@
     tone(659.25, 0.16, 0.20, 0.24, "triangle", false);
     tone(440, 0.32, 0.55, 0.26, "triangle", true);
   }
-  function buzz(ms){ try{ if(navigator.vibrate) navigator.vibrate(ms); }catch(e){} }
 
   /* ============ helpers ============ */
   function elapsed(){
@@ -791,7 +790,6 @@
     paintPlay();
     render();
     sndFlag();
-    buzz([90, 70, 90]);
     saveGame();
   }
 
@@ -808,7 +806,7 @@
       st.ticked = false;
       st.phase = RUN;
       paintPlay();                      // the bar has to show what the clock is doing
-      sndSwap(); buzz(14);
+      sndSwap();
       saveGame();
       return;
     }
@@ -822,7 +820,7 @@
     st.active = 1 - side;
     st.turnAt = now;
     st.ticked = false;
-    sndSwap(); buzz(14);
+    sndSwap();
     saveGame();
   }
 
@@ -942,7 +940,7 @@
     btnReset.setAttribute("aria-label", "Reset clock");
   }
   function armReset(){
-    if(armT){ disarm(); resetAll(); buzz(20); return; }   // second tap inside the window
+    if(armT){ disarm(); resetAll(); return; }             // second tap inside the window
     btnReset.classList.remove("armed");
     void btnReset.offsetWidth;                          // restart the drain animation
     btnReset.classList.add("armed");
diff --git a/public_html/sw.js b/public_html/sw.js
index fda7104..822eeff 100644
--- a/public_html/sw.js
+++ b/public_html/sw.js
@@ -1,5 +1,5 @@
 /* Cache-first: once installed the clock never touches the network again. */
-const CACHE = "bgclock-v14";
+const CACHE = "bgclock-v15";
 const FILES = [
   "./",
   "./index.html",