diff --git a/system/public/whistlegraph.org/index.html b/system/public/whistlegraph.org/index.html
index 2328cbaae3..297b9706ac 100644
--- a/system/public/whistlegraph.org/index.html
+++ b/system/public/whistlegraph.org/index.html
@@ -70,6 +70,11 @@
     font:16px/1.6 var(--sans);
     -webkit-font-smoothing:antialiased;
   }
+  /* the app bumper — one line across the top pointing at whistlegraph.app */
+  .bumper{display:block; background:var(--margin); color:var(--paper); text-align:center; font-size:14px; line-height:1.4; padding:8px 16px; text-decoration:none}
+  .bumper:visited{color:var(--paper)}
+  .bumper:hover{background:var(--ink); color:var(--paper)}
+  .bumper b{text-decoration:underline; text-underline-offset:2px}
   /* the page: one plain paper column */
   .pad{
     max-width:820px; margin:0 auto; min-height:100vh;
@@ -315,6 +320,7 @@
 <script type="module" src="https://aesthetic.computer/aesthetic.computer/lib/visit-tracker.mjs" crossorigin="anonymous" referrerpolicy="no-referrer"></script>
 </head>
 <body>
+<a class="bumper" href="https://whistlegraph.app/" data-i18n-html="bumper.app">Whistlegraph for iPhone — early access at <b>whistlegraph.app</b> →</a>
 <div class="pad">
 
   <dialog class="theme-dialog" id="themeDialog" aria-labelledby="themeTitle">
@@ -561,6 +567,7 @@ const EN={
   "filters.toggle":"Filters","filters.label":"Filter:",
   "section.aria":"Archive section","section.works":"Whistlegraphs","section.posts":"Posts",
   "section.about":"History","section.wild":"Wild",
+  "bumper.app":"Whistlegraph for iPhone — early access at <b>whistlegraph.app</b> →",
   "sort.viewed":"Popularity","sort.duration":"Duration","sort.videos":"Most videos",
   "sort.year":"By year","sort.title":"Title A–Z","sort.author":"Author A–Z",
   "sort.reverse":"Reverse order","sort.newest":"Newest","sort.oldest":"Oldest",
diff --git a/system/public/whistlegraph.org/locales/da.json b/system/public/whistlegraph.org/locales/da.json
index 8d8bc12203..43a4eca0c5 100644
--- a/system/public/whistlegraph.org/locales/da.json
+++ b/system/public/whistlegraph.org/locales/da.json
@@ -28,6 +28,7 @@
   "section.posts": "Opslag",
   "section.about": "Historie",
   "section.wild": "I det fri",
+  "bumper.app": "Whistlegraph til iPhone — tidlig adgang på <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Popularitet",
   "sort.duration": "Varighed",
diff --git a/system/public/whistlegraph.org/locales/de.json b/system/public/whistlegraph.org/locales/de.json
index 7ec2b2aaa5..cbee622257 100644
--- a/system/public/whistlegraph.org/locales/de.json
+++ b/system/public/whistlegraph.org/locales/de.json
@@ -28,6 +28,7 @@
   "section.posts": "Beiträge",
   "section.about": "Geschichte",
   "section.wild": "Sichtungen",
+  "bumper.app": "Whistlegraph fürs iPhone — früher Zugang auf <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Beliebtheit",
   "sort.duration": "Dauer",
diff --git a/system/public/whistlegraph.org/locales/en.json b/system/public/whistlegraph.org/locales/en.json
index 0b6bf2fcdb..4bb8d8da4b 100644
--- a/system/public/whistlegraph.org/locales/en.json
+++ b/system/public/whistlegraph.org/locales/en.json
@@ -28,6 +28,7 @@
   "section.posts": "Posts",
   "section.about": "History",
   "section.wild": "Wild",
+  "bumper.app": "Whistlegraph for iPhone — early access at <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Popularity",
   "sort.duration": "Duration",
diff --git a/system/public/whistlegraph.org/locales/es.json b/system/public/whistlegraph.org/locales/es.json
index 0e7f0d89da..3cdcf32c8d 100644
--- a/system/public/whistlegraph.org/locales/es.json
+++ b/system/public/whistlegraph.org/locales/es.json
@@ -28,6 +28,7 @@
   "section.posts": "Publicaciones",
   "section.about": "Historia",
   "section.wild": "Avistamientos",
+  "bumper.app": "Whistlegraph para iPhone — acceso anticipado en <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Popularidad",
   "sort.duration": "Duración",
diff --git a/system/public/whistlegraph.org/locales/fr.json b/system/public/whistlegraph.org/locales/fr.json
index 6562fdb974..74111b606a 100644
--- a/system/public/whistlegraph.org/locales/fr.json
+++ b/system/public/whistlegraph.org/locales/fr.json
@@ -28,6 +28,7 @@
   "section.posts": "Publications",
   "section.about": "Histoire",
   "section.wild": "Dans la nature",
+  "bumper.app": "Whistlegraph pour iPhone — accès anticipé sur <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Popularité",
   "sort.duration": "Durée",
diff --git a/system/public/whistlegraph.org/locales/hi.json b/system/public/whistlegraph.org/locales/hi.json
index cdfb5566e1..5b1b1894f2 100644
--- a/system/public/whistlegraph.org/locales/hi.json
+++ b/system/public/whistlegraph.org/locales/hi.json
@@ -28,6 +28,7 @@
   "section.posts": "पोस्ट",
   "section.about": "इतिहास",
   "section.wild": "जंगल में",
+  "bumper.app": "iPhone के लिए Whistlegraph — <b>whistlegraph.app</b> पर अर्ली एक्सेस →",
 
   "sort.viewed": "लोकप्रियता",
   "sort.duration": "अवधि",
diff --git a/system/public/whistlegraph.org/locales/ja.json b/system/public/whistlegraph.org/locales/ja.json
index c4f1cfcf20..3c0f44824c 100644
--- a/system/public/whistlegraph.org/locales/ja.json
+++ b/system/public/whistlegraph.org/locales/ja.json
@@ -28,6 +28,7 @@
   "section.posts": "投稿",
   "section.about": "歴史",
   "section.wild": "野生",
+  "bumper.app": "iPhone版 Whistlegraph — 先行アクセスは <b>whistlegraph.app</b> へ →",
 
   "sort.viewed": "人気順",
   "sort.duration": "長さ順",
diff --git a/system/public/whistlegraph.org/locales/ko.json b/system/public/whistlegraph.org/locales/ko.json
index fefbe096a3..c3b6ddbdf2 100644
--- a/system/public/whistlegraph.org/locales/ko.json
+++ b/system/public/whistlegraph.org/locales/ko.json
@@ -28,6 +28,7 @@
   "section.posts": "게시물",
   "section.about": "역사",
   "section.wild": "야생",
+  "bumper.app": "iPhone용 Whistlegraph — <b>whistlegraph.app</b>에서 얼리 액세스 →",
 
   "sort.viewed": "인기순",
   "sort.duration": "길이순",
diff --git a/system/public/whistlegraph.org/locales/nl.json b/system/public/whistlegraph.org/locales/nl.json
index ec8a19df6f..d1d19e8cb6 100644
--- a/system/public/whistlegraph.org/locales/nl.json
+++ b/system/public/whistlegraph.org/locales/nl.json
@@ -28,6 +28,7 @@
   "section.posts": "Posts",
   "section.about": "Geschiedenis",
   "section.wild": "In het wild",
+  "bumper.app": "Whistlegraph voor iPhone — vroege toegang op <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Populariteit",
   "sort.duration": "Duur",
diff --git a/system/public/whistlegraph.org/locales/ru.json b/system/public/whistlegraph.org/locales/ru.json
index a939024f8d..1ee44a1c42 100644
--- a/system/public/whistlegraph.org/locales/ru.json
+++ b/system/public/whistlegraph.org/locales/ru.json
@@ -28,6 +28,7 @@
   "section.posts": "Посты",
   "section.about": "История",
   "section.wild": "Наблюдения",
+  "bumper.app": "Whistlegraph для iPhone — ранний доступ на <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Популярность",
   "sort.duration": "Длительность",
diff --git a/system/public/whistlegraph.org/locales/tl.json b/system/public/whistlegraph.org/locales/tl.json
index c678c1e013..b9871fae3b 100644
--- a/system/public/whistlegraph.org/locales/tl.json
+++ b/system/public/whistlegraph.org/locales/tl.json
@@ -28,6 +28,7 @@
   "section.posts": "Mga Post",
   "section.about": "Kasaysayan",
   "section.wild": "Wild",
+  "bumper.app": "Whistlegraph para sa iPhone — maagang access sa <b>whistlegraph.app</b> →",
 
   "sort.viewed": "Kasikatan",
   "sort.duration": "Tagal",
diff --git a/system/public/whistlegraph.org/locales/zh.json b/system/public/whistlegraph.org/locales/zh.json
index abc16ebc78..ae1cf5825d 100644
--- a/system/public/whistlegraph.org/locales/zh.json
+++ b/system/public/whistlegraph.org/locales/zh.json
@@ -28,6 +28,7 @@
   "section.posts": "帖子",
   "section.about": "历史",
   "section.wild": "野外",
+  "bumper.app": "iPhone 版 Whistlegraph — 抢先体验请访问 <b>whistlegraph.app</b> →",
 
   "sort.viewed": "热度",
   "sort.duration": "时长",