diff --git a/package.json b/package.json
index 8ef3aa5..3d509c8 100644
--- a/package.json
+++ b/package.json
@@ -6,10 +6,10 @@
     "node": ">=22.12.0"
   },
   "scripts": {
-    "dev": "astro dev",
+    "dev": "PUBLIC_GIT_COMMIT=$(git rev-parse HEAD) astro dev",
     "preview": "astro preview",
     "astro": "astro",
-    "build": "astro build"
+    "build": "PUBLIC_GIT_COMMIT=$(git rev-parse HEAD) astro build"
   },
   "dependencies": {
     "@astrojs/rss": "^4.0.17",
diff --git a/src/components/BuildHashBlocks.astro b/src/components/BuildHashBlocks.astro
new file mode 100644
index 0000000..c6f703d
--- /dev/null
+++ b/src/components/BuildHashBlocks.astro
@@ -0,0 +1,42 @@
+---
+const rawHash = (import.meta.env.PUBLIC_GIT_COMMIT || "")
+    .replace(/[^a-fA-F0-9]/g, "")
+    .toLowerCase();
+
+const safeHash = rawHash || "0000000000000000000000000000000000000000";
+
+const blockCount = 6;
+const hexPerBlock = 6;
+
+const blocks: string[] = Array.from({ length: blockCount }, (_, i) => {
+    const start = i * hexPerBlock;
+    const part = safeHash.slice(start, start + hexPerBlock).padEnd(6, "0");
+    return `#${part}`;
+});
+---
+
+<div
+    class="build-hash"
+    title={`Build ${safeHash}`}
+    aria-label={`Build ${safeHash}`}
+>
+    {
+        blocks.map((color: string) => (
+            <span class="build-block" style={`background:${color}`} />
+        ))
+    }
+</div>
+
+<style>
+    .build-hash {
+        display: inline-flex;
+        align-items: center;
+        vertical-align: middle;
+    }
+
+    .build-block {
+        width: 0.7rem;
+        height: 0.7rem;
+        display: inline-block;
+    }
+</style>
diff --git a/src/components/Footer.astro b/src/components/Footer.astro
index e0ca0c3..0836412 100644
--- a/src/components/Footer.astro
+++ b/src/components/Footer.astro
@@ -1,6 +1,7 @@
 ---
 import { getLangFromUrl, getTranslations, type Lang } from "@/i18n";
-
+import BuildHashBlocks from "@/components/BuildHashBlocks.astro";
+const commit = import.meta.env.PUBLIC_GIT_COMMIT || "unknown";
 const lang = getLangFromUrl(Astro.url);
 const t = getTranslations(lang);
 ---
@@ -8,6 +9,8 @@ const t = getTranslations(lang);
 <footer class="footer">
   <p set:html={t.footer.githubIntro} />
   <p set:html={t.footer.repoIntro} />
+  <BuildHashBlocks />
+  <code class="build-commit">{commit.slice(0, 7)}</code>
 </footer>
 
 <style>