diff --git a/crates/lanspread-tauri-deno-ts/src/components/modals/SettingsDialog.tsx b/crates/lanspread-tauri-deno-ts/src/components/modals/SettingsDialog.tsx
index 58492bd..49e7083 100644
--- a/crates/lanspread-tauri-deno-ts/src/components/modals/SettingsDialog.tsx
+++ b/crates/lanspread-tauri-deno-ts/src/components/modals/SettingsDialog.tsx
@@ -18,6 +18,8 @@ interface Props {
     onClose: () => void;
 }
 
+const buildNr = import.meta.env.VITE_LANSPREAD_BUILD_NR;
+
 interface RowProps {
     label: string;
     hint: string;
@@ -126,6 +128,7 @@ export const SettingsDialog = ({ settings, onChange, onClose }: Props) => (
         </div>
 
         <div className="settings-foot">
+            <div className="settings-build-nr">Build-Nr: {buildNr}</div>
             <button type="button" className="settings-done" onClick={onClose}>Done</button>
         </div>
     </Modal>
diff --git a/crates/lanspread-tauri-deno-ts/src/styles/launcher.css b/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
index fa1667b..1059279 100644
--- a/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
+++ b/crates/lanspread-tauri-deno-ts/src/styles/launcher.css
@@ -1468,11 +1468,18 @@
 }
 .settings-foot {
   display: flex;
-  justify-content: flex-end;
+  align-items: center;
+  justify-content: space-between;
   padding: 14px 22px 18px;
   border-top: 1px solid var(--bd-1);
   gap: 10px;
 }
+.settings-build-nr {
+  min-width: 0;
+  color: var(--t-3);
+  font-size: 12px;
+  font-variant-numeric: tabular-nums;
+}
 .settings-done {
   height: 36px;
   padding: 0 22px;
diff --git a/crates/lanspread-tauri-deno-ts/src/vite-env.d.ts b/crates/lanspread-tauri-deno-ts/src/vite-env.d.ts
index 11f02fe..be02c2d 100644
--- a/crates/lanspread-tauri-deno-ts/src/vite-env.d.ts
+++ b/crates/lanspread-tauri-deno-ts/src/vite-env.d.ts
@@ -1 +1,5 @@
 /// <reference types="vite/client" />
+
+interface ImportMetaEnv {
+    readonly VITE_LANSPREAD_BUILD_NR: string;
+}
diff --git a/crates/lanspread-tauri-deno-ts/vite.config.ts b/crates/lanspread-tauri-deno-ts/vite.config.ts
index f74d1b2..ce60391 100644
--- a/crates/lanspread-tauri-deno-ts/vite.config.ts
+++ b/crates/lanspread-tauri-deno-ts/vite.config.ts
@@ -1,12 +1,18 @@
 import { defineConfig } from "vite";
 import react from "@vitejs/plugin-react";
 
+// A timestamp keeps build numbers monotonic without a checked-in counter file.
+const buildNr = Date.now().toString();
+
 // @ts-expect-error process is a nodejs global
 const host = process.env.TAURI_DEV_HOST;
 
 // https://vitejs.dev/config/
 export default defineConfig(async () => ({
   plugins: [react()],
+  define: {
+    "import.meta.env.VITE_LANSPREAD_BUILD_NR": JSON.stringify(buildNr),
+  },
 
   // Vite options tailored for Tauri development and only applied in `tauri dev` or `tauri build`
   //