diff --git a/src/backend/interfaces/WebsocketServerInterface.py b/src/backend/interfaces/WebsocketServerInterface.py
index 52b15d7..26f1cae 100644
--- a/src/backend/interfaces/WebsocketServerInterface.py
+++ b/src/backend/interfaces/WebsocketServerInterface.py
@@ -57,6 +57,10 @@ class WebsocketServerInterface(Interface):
         thread.daemon = True
         thread.start()
 
+    @property
+    def clients(self):
+        return len(self.spawned_interfaces)
+
     # todo docs
     def received_announce(self, from_spawned=False):
         if from_spawned:
@@ -124,6 +128,9 @@ class WebsocketServerInterface(Interface):
             # run read loop
             spawned_interface.read_loop()
 
+            # client must have disconnected as the read loop finished, so forget the spawned interface
+            self.spawned_interfaces.remove(spawned_interface)
+
         # run websocket server
         try:
             with serve(on_websocket_client_connected, self.listen_ip, self.listen_port, compression=None) as server: