diff --git a/CLAUDE.md b/CLAUDE.md
index 5b1fb6a..94f8a3a 100644
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -31,7 +31,7 @@ pip install -r requirements.txt
 python kao.py
 ```
 
-UI available at http://localhost:5000
+UI available at http://localhost:5100
 
 ## Configuration
 
@@ -39,7 +39,7 @@ Edit `config.json` to configure detectors:
 
 ```json
 {
-  "aggregator_url": "http://localhost:5000",
+  "aggregator_url": "http://localhost:5100",
   "aggregator": { "script": "aggregator.py" },
   "detectors": [
     {
diff --git a/README.md b/README.md
index 6ba6469..16a3fbf 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ pip install -r requirements.txt
 python kao.py
 ```
 
-Open http://localhost:5000 on your phone (use Fully Kiosk Browser for best results).
+Open http://localhost:5100 on your phone (use Fully Kiosk Browser for best results).
 
 ## Status Faces
 
@@ -59,7 +59,7 @@ Edit `config.json` to enable/disable detectors and set thresholds:
 
 ```json
 {
-  "aggregator_url": "http://localhost:5000",
+  "aggregator_url": "http://localhost:5100",
   "detectors": [
     {
       "name": "disk_space",
@@ -80,7 +80,7 @@ Edit `config.json` to enable/disable detectors and set thresholds:
 Create your own detector by POSTing events to the aggregator:
 
 ```bash
-curl -X POST http://localhost:5000/event \
+curl -X POST http://localhost:5100/event \
   -H "Content-Type: application/json" \
   -d '{"id": "my_check", "priority": 2, "message": "Something is wrong", "ttl": 120}'
 ```
@@ -92,7 +92,7 @@ curl -X POST http://localhost:5000/event \
 
 Clear an event:
 ```bash
-curl -X POST http://localhost:5000/clear \
+curl -X POST http://localhost:5100/clear \
   -d '{"id": "my_check"}'
 ```
 
@@ -103,10 +103,10 @@ Add webhook commands to your Home Assistant config:
 ```yaml
 rest_command:
   sentry_sleep:
-    url: "http://YOUR_SERVER:5000/sleep"
+    url: "http://YOUR_SERVER:5100/sleep"
     method: POST
   sentry_wake:
-    url: "http://YOUR_SERVER:5000/wake"
+    url: "http://YOUR_SERVER:5100/wake"
     method: POST
 ```
 
diff --git a/aggregator.py b/aggregator.py
index 1160aff..6002fe0 100644
--- a/aggregator.py
+++ b/aggregator.py
@@ -4,6 +4,7 @@ A lightweight event broker that manages priority-based system status.
 """
 
 import json
+import os
 import random
 import threading
 import time
@@ -252,6 +253,8 @@ def list_events():
 
 
 def main():
+    port = int(os.environ.get("PORT", 5100))
+
     # Write initial optimal state
     write_status()
     print(f"Status file: {STATUS_FILE}")
@@ -261,7 +264,7 @@ def main():
     cleanup_thread.start()
 
     # Run Flask
-    app.run(host="0.0.0.0", port=5000, threaded=True)
+    app.run(host="0.0.0.0", port=port, threaded=True)
 
 
 if __name__ == "__main__":
diff --git a/config.json b/config.json
index 60841db..41587f7 100644
--- a/config.json
+++ b/config.json
@@ -1,5 +1,5 @@
 {
-	"aggregator_url": "http://localhost:5000",
+	"port": 5100,
 	"aggregator": {
 		"script": "aggregator.py"
 	},
diff --git a/install.sh b/install.sh
index 4155337..a30a172 100644
--- a/install.sh
+++ b/install.sh
@@ -68,7 +68,7 @@ echo "===================================="
 echo "  Installation complete!"
 echo "===================================="
 echo ""
-echo "Kao is now running at http://$(hostname -I | awk '{print $1}'):5000"
+echo "Kao is now running at http://$(hostname -I | awk '{print $1}'):5100"
 echo ""
 echo "Commands:"
 echo "  sudo systemctl status kao    # Check status"
diff --git a/kao.py b/kao.py
index edb5290..d98a4df 100644
--- a/kao.py
+++ b/kao.py
@@ -89,11 +89,17 @@ class KaoManager:
                     break
                 print(f"[{name}] {line.rstrip()}")
 
+    def get_aggregator_url(self):
+        """Get aggregator URL from config port."""
+        port = self.config.get("port", 5100)
+        return f"http://localhost:{port}"
+
     def start_aggregator(self):
         """Start the aggregator service."""
         agg_config = self.config.get("aggregator", {})
         script = agg_config.get("script", "aggregator.py")
         env = agg_config.get("env", {})
+        env["PORT"] = str(self.config.get("port", 5100))
 
         process = self.start_process("aggregator", script, env)
         if process:
@@ -102,13 +108,12 @@ class KaoManager:
                 "config": {"name": "aggregator", "script": script, "env": env},
             }
             # Wait for aggregator to be ready
-            url = self.config.get("aggregator_url", "http://localhost:5000")
-            return self.wait_for_aggregator(url)
+            return self.wait_for_aggregator(self.get_aggregator_url())
         return False
 
     def start_detectors(self):
         """Start all enabled detectors."""
-        url = self.config.get("aggregator_url", "http://localhost:5000")
+        url = self.get_aggregator_url()
 
         for detector in self.config.get("detectors", []):
             if not detector.get("enabled", True):
@@ -140,7 +145,7 @@ class KaoManager:
 
                 if self.running:
                     config = info["config"]
-                    env = {"AGGREGATOR_URL": self.config.get("aggregator_url", "http://localhost:5000")}
+                    env = {"AGGREGATOR_URL": self.get_aggregator_url()}
                     env.update(config.get("env", {}))
 
                     new_process = self.start_process(name, config["script"], env)
@@ -186,7 +191,7 @@ class KaoManager:
         print("  Kao")
         print("=" * 50)
         print(f"Config: {self.config_path}")
-        print(f"Aggregator URL: {self.config.get('aggregator_url')}")
+        print(f"Port: {self.config.get('port', 5100)}")
         print()
 
         enabled = [d["name"] for d in self.config.get("detectors", []) if d.get("enabled", True)]
@@ -211,7 +216,7 @@ class KaoManager:
 
         print()
         print("=" * 50)
-        print(f"  UI available at: {self.config.get('aggregator_url')}")
+        print(f"  UI available at: {self.get_aggregator_url()}")
         print("=" * 50)
         print()