diff --git a/system/ui/README.md b/system/ui/README.md
index f81cb5573a..796d298626 100644
--- a/system/ui/README.md
+++ b/system/ui/README.md
@@ -10,6 +10,7 @@ Quick start:
 * set `BURN_IN=1` to get a burn-in heatmap version of the UI
 * set `GRID=50` to show a 50-pixel alignment grid overlay
 * set `MAGIC_DEBUG=1` to show every dropped frames (only on device)
+* set `SUNNYPILOT_UI=0` to run the stock UI instead of the sunnypilot UI
 * https://www.raylib.com/cheatsheet/cheatsheet.html
 * https://electronstudio.github.io/raylib-python-cffi/README.html#quickstart
 
diff --git a/system/ui/lib/application.py b/system/ui/lib/application.py
index e3370a5f74..7271127838 100644
--- a/system/ui/lib/application.py
+++ b/system/ui/lib/application.py
@@ -19,6 +19,8 @@ from openpilot.system.hardware import HARDWARE, PC
 from openpilot.system.ui.lib.multilang import multilang
 from openpilot.common.realtime import Ratekeeper
 
+from openpilot.system.ui.sunnypilot.lib.application import GuiApplicationExt
+
 _DEFAULT_FPS = int(os.getenv("FPS", {'tizi': 20}.get(HARDWARE.get_device_type(), 60)))
 FPS_LOG_INTERVAL = 5  # Seconds between logging FPS drops
 FPS_DROP_THRESHOLD = 0.9  # FPS drop threshold for triggering a warning
@@ -186,7 +188,7 @@ class MouseState:
         self._prev_mouse_event[slot] = ev
 
 
-class GuiApplication:
+class GuiApplication(GuiApplicationExt):
   def __init__(self, width: int | None = None, height: int | None = None):
     self._fonts: dict[FontWeight, rl.Font] = {}
     self._width = width if width is not None else GuiApplication._default_width()
diff --git a/system/ui/sunnypilot/lib/application.py b/system/ui/sunnypilot/lib/application.py
new file mode 100644
index 0000000000..b39bf31e9d
--- /dev/null
+++ b/system/ui/sunnypilot/lib/application.py
@@ -0,0 +1,15 @@
+"""
+Copyright (c) 2021-, Haibin Wen, sunnypilot, and a number of other contributors.
+
+This file is part of sunnypilot and is licensed under the MIT License.
+See the LICENSE.md file in the root directory for more details.
+"""
+import os
+
+SUNNYPILOT_UI = os.getenv("SUNNYPILOT_UI", "1") == "1"
+
+
+class GuiApplicationExt:
+  @staticmethod
+  def sunnypilot_ui() -> bool:
+    return SUNNYPILOT_UI