diff --git a/src/client/App.tsx b/src/client/App.tsx
index 220012e..84712d5 100644
--- a/src/client/App.tsx
+++ b/src/client/App.tsx
@@ -6,6 +6,7 @@ import { EventRow, type RowEvent } from "./components/EventRow.tsx";
 import { NextUp } from "./components/NextUp.tsx";
 import { Timeline } from "./components/Timeline.tsx";
 import { Welcome } from "./components/Welcome.tsx";
+import { Colophon } from "./components/Colophon.tsx";
 import { useCompletions } from "./state/useCompletions.ts";
 import { usePrefs } from "./state/usePrefs.ts";
 import { clockFor, DAY, endingSoonestFirst, formatRemaining } from "../shared/time.ts";
@@ -13,6 +14,28 @@ import type { GameId } from "../shared/schema.ts";
 
 type View = "soon" | "calendar";
 
+/**
+ * Connection state. Offline is not an error here — the service worker serves
+ * the last feed it saw and countdowns run off the local clock — but it does
+ * change what the reader can trust, so it is surfaced rather than hidden.
+ */
+function useOnline(): boolean {
+  const [online, setOnline] = useState(() =>
+    typeof navigator === "undefined" ? true : navigator.onLine,
+  );
+  useEffect(() => {
+    const up = () => setOnline(true);
+    const down = () => setOnline(false);
+    window.addEventListener("online", up);
+    window.addEventListener("offline", down);
+    return () => {
+      window.removeEventListener("online", up);
+      window.removeEventListener("offline", down);
+    };
+  }, []);
+  return online;
+}
+
 /** Ticks once a second so countdowns stay honest without re-fetching. */
 function useNow(intervalMs = 1000): number {
   const [now, setNow] = useState(() => Date.now());
@@ -28,6 +51,7 @@ export function App() {
   const [view, setView] = useState<View>("soon");
   const [openId, setOpenId] = useState<string | null>(null);
   const now = useNow();
+  const online = useOnline();
   const { prefs, update, toggleGame } = usePrefs();
   const { completions, toggle, merge } = useCompletions();
 
@@ -122,8 +146,14 @@ export function App() {
           <p className="font-display text-[0.9375rem] font-bold tracking-[0.02em]">
             EVENT<span className="text-near">CLOCK</span>
           </p>
-          <p className="mt-0.5 text-xs text-faint">
+          <p className="mt-0.5 flex items-center gap-1.5 text-xs text-faint">
             {live.length} live · {upcoming.length} upcoming
+            {!online && (
+              <span className="inline-flex items-center gap-1 text-soon">
+                <span aria-hidden className="size-1.5 rounded-full bg-soon" />
+                offline
+              </span>
+            )}
           </p>
         </div>
 
@@ -219,19 +249,17 @@ export function App() {
         onImport={(file) => void importProgress(file, merge)}
       />
 
-      <footer className="px-4 pb-10 pt-2 text-xs leading-relaxed text-faint">
-        <p>
-          Dates come from community wikis and are shown in your local time. Every
-          event links to its source — check there before the last hours.
+      {!online && (
+        <p className="border-t border-hairline px-4 py-3 text-xs leading-relaxed text-soon">
+          You're offline. These are the events last downloaded
+          {" "}
+          {formatRemaining(now - Date.parse(state.feed.generatedAt))} ago, and
+          countdowns are still running. Anything rescheduled since then won't
+          show until you reconnect.
         </p>
-        {staleSources.length > 0 && (
-          <p className="mt-2 text-soon">
-            {staleSources.length} source
-            {staleSources.length > 1 ? "s have" : " has"} not refreshed in over two
-            days. Some end dates may have moved.
-          </p>
-        )}
-      </footer>
+      )}
+
+      <Colophon sources={state.feed.sources} staleCount={staleSources.length} />
 
       {openRow !== null && (
         <EventDetail
diff --git a/src/client/components/Colophon.tsx b/src/client/components/Colophon.tsx
new file mode 100644
index 0000000..b124da9
--- /dev/null
+++ b/src/client/components/Colophon.tsx
@@ -0,0 +1,91 @@
+import { gameMeta } from "../../shared/games.ts";
+import type { SourceHealth } from "../../shared/feed.ts";
+
+export const REPO_URL = "https://github.com/StereotypicalCat/gacha-event-tracker";
+
+/**
+ * Credit, disclaimer, and where the code lives.
+ *
+ * This sits at the foot of the page rather than behind an "About" link: the
+ * people whose work this depends on should be visible on the same screen as
+ * the data, not one navigation step away from it.
+ */
+export function Colophon({
+  sources,
+  staleCount,
+}: {
+  sources: SourceHealth[];
+  staleCount: number;
+}) {
+  const games = [...new Set(sources.map((s) => s.game))];
+
+  return (
+    <footer className="border-t border-hairline px-4 pb-12 pt-6 text-xs leading-relaxed text-faint">
+      <p>
+        Dates are shown in your local time. Every event links to the page it came
+        from — check there before the last hours.
+      </p>
+
+      {staleCount > 0 && (
+        <p className="mt-2 text-soon">
+          {staleCount} source{staleCount > 1 ? "s have" : " has"} not refreshed in
+          over two days. Some end dates may have moved.
+        </p>
+      )}
+
+      <div className="mt-5">
+        <p className="eyebrow">With thanks to</p>
+        <p className="mt-1.5">
+          <a
+            href="https://game8.co"
+            target="_blank"
+            rel="noreferrer noopener"
+            className="text-muted underline decoration-hairline underline-offset-2 transition-colors duration-150 hover:text-ink hover:decoration-near"
+          >
+            Game8
+          </a>
+          {", whose editors compile and maintain the event calendars this reads from. The schedules are their work; this page only rearranges them."}
+        </p>
+        <p className="mt-2">
+          And to HoYoverse, Kuro Games, Hypergryph and Hotta Studio, who make the
+          games worth keeping track of —{" "}
+          {games.map((g, i) => (
+            <span key={g}>
+              {i > 0 && ", "}
+              <span style={{ color: gameMeta(g).hue }}>{gameMeta(g).name}</span>
+            </span>
+          ))}
+          {"."}
+        </p>
+      </div>
+
+      <div className="mt-5 border-t border-hairline pt-4">
+        <p>
+          <strong className="font-semibold text-muted">Not affiliated</strong>{" "}
+          with Game8, HoYoverse, Kuro Games, Hypergryph, Hotta Studio, or any
+          other publisher or source named here. This is an unofficial fan-made
+          tool, not endorsed by or connected to any of them. All game names,
+          event names and trademarks belong to their respective owners.
+        </p>
+        <p className="mt-2">
+          Event dates can be wrong or go out of date. Treat the source page as
+          the authority, not this one.
+        </p>
+      </div>
+
+      <p className="mt-5">
+        <a
+          href={REPO_URL}
+          target="_blank"
+          rel="noreferrer noopener"
+          className="inline-flex items-center gap-1.5 text-muted transition-colors duration-150 hover:text-ink"
+        >
+          <svg viewBox="0 0 16 16" className="size-3.5" fill="currentColor" aria-hidden>
+            <path d="M8 0a8 8 0 0 0-2.53 15.59c.4.07.55-.17.55-.38l-.01-1.49c-2.01.37-2.53-.49-2.69-.94-.09-.23-.48-.94-.82-1.13-.28-.15-.68-.52-.01-.53.63-.01 1.08.58 1.23.82.72 1.21 1.87.87 2.33.66.07-.52.28-.87.51-1.07-1.78-.2-3.64-.89-3.64-3.95 0-.87.31-1.59.82-2.15-.08-.2-.36-1.02.08-2.12 0 0 .67-.21 2.2.82a7.4 7.4 0 0 1 4 0c1.53-1.04 2.2-.82 2.2-.82.44 1.1.16 1.92.08 2.12.51.56.82 1.27.82 2.15 0 3.07-1.87 3.75-3.65 3.95.29.25.54.73.54 1.48l-.01 2.19c0 .21.15.46.55.38A8 8 0 0 0 8 0Z" />
+          </svg>
+          Source code on GitHub
+        </a>
+      </p>
+    </footer>
+  );
+}