diff --git a/src/apps/Projects.tsx b/src/apps/Projects.tsx
index b2ab419..a35b622 100644
--- a/src/apps/Projects.tsx
+++ b/src/apps/Projects.tsx
@@ -4,6 +4,7 @@ const PROJECTS = [
   { name: 'go-local-rag-email', desc: 'Local-first Gmail assistant: semantic search and AI summaries via RAG, runs offline.', tags: ['Go', 'Qdrant', 'SQLite', 'RAG'], color: '#00ffff' },
   { name: 'Collab Platform', desc: 'Real-time collaborative workspace with WebSocket rooms and conflict resolution.', tags: ['TypeScript', 'Bun', 'WebSocket'], color: '#ffd60a' },
   { name: '成语填空', desc: 'Daily Chinese idiom guessing game — Wordle-style, runs at chengyu.m1ngdaxie.com.', tags: ['React', 'TypeScript'], color: '#ff453a' },
+  { name: 'Treehole', desc: 'Anonymous ephemeral chat — messages vanish after timeout, no database, no logs.', tags: ['Go', 'WebSocket'], color: '#30d158' },
 ];
 
 export default function Projects() {
diff --git a/src/apps/Treehole.tsx b/src/apps/Treehole.tsx
new file mode 100644
index 0000000..4810c2b
--- /dev/null
+++ b/src/apps/Treehole.tsx
@@ -0,0 +1,10 @@
+export default function Treehole() {
+  return (
+    <iframe
+      src="https://yehua-treehole.fly.dev"
+      style={{ width: '100%', height: '100%', border: 'none', display: 'block' }}
+      title="Treehole"
+      allow="clipboard-write"
+    />
+  );
+}
diff --git a/src/config/apps.ts b/src/config/apps.ts
index 54c65fe..50844a3 100644
--- a/src/config/apps.ts
+++ b/src/config/apps.ts
@@ -7,6 +7,7 @@ import Alfred from '../apps/Alfred';
 import Chengyu from '../apps/Chengyu';
 import Poker from '../apps/Poker';
 import Trash from '../apps/Trash';
+import Treehole from '../apps/Treehole';
 import { withVersion } from './version';
 
 export const APPS: AppConfig[] = [
@@ -102,6 +103,16 @@ export const APPS: AppConfig[] = [
     desktopPosition: { col: 0, row: 4 },
     externalUrl: 'https://collab.m1ngdaxie.com/',
   },
+  {
+    id: 'treehole',
+    title: 'Treehole',
+    emoji: '🌳',
+    iconGradient: 'linear-gradient(135deg, #1a3a1a, #2d5a2d)',
+    defaultSize: { width: 680, height: 520 },
+    defaultPosition: { x: 180, y: 100 },
+    component: Treehole,
+    desktopPosition: { col: 1, row: 4 },
+  },
 ];
 
 export const WALLPAPERS = [