diff --git a/gui_v6/app.py b/gui_v6/app.py
index db61a68..4124a76 100644
--- a/gui_v6/app.py
+++ b/gui_v6/app.py
@@ -11,6 +11,7 @@ La fenêtre n'est créée qu'à l'instanciation de :class:`AnonymisationApp`.
 
 from __future__ import annotations
 
+import os
 from typing import Optional
 
 import customtkinter as ctk
@@ -23,6 +24,14 @@ from gui_v6.tabs.tab_about import AboutTab
 from gui_v6.tabs.tab_config import ConfigTab
 from gui_v6.tabs.tab_usage import UsageTab
 
+DEFAULT_PORTAL_URL = "https://app.aivanov.eu"
+
+
+def resolve_portal_url() -> str:
+    """URL du portail : env ``ANON_PORTAL_URL`` sinon défaut prod."""
+    return os.environ.get("ANON_PORTAL_URL", DEFAULT_PORTAL_URL)
+
+
 _TABS = [
     ("use", "📄 Utilisation"),
     ("cfg", "⚙️ Administration"),
@@ -38,7 +47,7 @@ class AnonymisationApp(ctk.CTk):
     ) -> None:
         super().__init__()
         self._theme_name = theme_name
-        self._license_client = license_client or LicenseClient("http://localhost")
+        self._license_client = license_client or LicenseClient(resolve_portal_url())
         self._config = ConfigState()
         self._active = "use"
         self._tab_buttons: dict = {}
@@ -196,7 +205,7 @@ class AnonymisationApp(ctk.CTk):
             if session is None:
                 return
             status = self._safe_local_status()
-            base_url = getattr(self._license_client, "_base_url", "") or "http://localhost"
+            base_url = getattr(self._license_client, "_base_url", "") or resolve_portal_url()
             usage_telemetry.report_run_summary(
                 summary,
                 base_url=base_url,
diff --git a/tests/unit/test_gui_v6_portal_url.py b/tests/unit/test_gui_v6_portal_url.py
new file mode 100644
index 0000000..3e0c06c
--- /dev/null
+++ b/tests/unit/test_gui_v6_portal_url.py
@@ -0,0 +1,14 @@
+import pytest
+
+
+def test_default_portal_url_is_prod(monkeypatch):
+    monkeypatch.delenv("ANON_PORTAL_URL", raising=False)
+    from gui_v6.app import DEFAULT_PORTAL_URL, resolve_portal_url
+    assert DEFAULT_PORTAL_URL == "https://app.aivanov.eu"
+    assert resolve_portal_url() == "https://app.aivanov.eu"
+
+
+def test_portal_url_env_override(monkeypatch):
+    monkeypatch.setenv("ANON_PORTAL_URL", "http://localhost:8088")
+    from gui_v6.app import resolve_portal_url
+    assert resolve_portal_url() == "http://localhost:8088"