diff --git a/common/libcommon.a b/common/libcommon.a
index 4d8ac4398..b566e9dad 100644
Binary files a/common/libcommon.a and b/common/libcommon.a differ
diff --git a/common/params_keys.h b/common/params_keys.h
index a8bf00c3a..eab732600 100644
--- a/common/params_keys.h
+++ b/common/params_keys.h
@@ -126,6 +126,7 @@ inline static std::unordered_map<std::string, ParamKeyAttributes> keys = {
     {"SecOCKey", {PERSISTENT | DONT_LOG, STRING}},
     {"ShowDebugInfo", {PERSISTENT, BOOL}},
     {"ShowAllToggles", {PERSISTENT, BOOL, "0", "0", 3}},
+    {"TryRaylibUI", {PERSISTENT, BOOL, "0"}},
     {"UsePrebuilt", {PERSISTENT, BOOL, "1"}},
     {"RouteCount", {PERSISTENT, INT, "0"}},
     {"SnoozeUpdate", {CLEAR_ON_MANAGER_START | CLEAR_ON_OFFROAD_TRANSITION, BOOL}},
diff --git a/common/params_pyx.so b/common/params_pyx.so
index 3a74bb864..194c25da5 100755
Binary files a/common/params_pyx.so and b/common/params_pyx.so differ
diff --git a/starpilot/system/the_galaxy/assets/components/tools/device_settings_layout.json b/starpilot/system/the_galaxy/assets/components/tools/device_settings_layout.json
index 19a1951e1..3c6f47bcf 100644
--- a/starpilot/system/the_galaxy/assets/components/tools/device_settings_layout.json
+++ b/starpilot/system/the_galaxy/assets/components/tools/device_settings_layout.json
@@ -3632,6 +3632,13 @@
     "name": "Developer",
     "icon": "bi-exclamation-triangle",
     "params": [
+      {
+        "key": "TryRaylibUI",
+        "label": "Try raylib UI",
+        "description": "Use the beta raylib UI instead of the default Qt UI on tici/tizi devices. This setting has no effect on C4/mici devices.",
+        "data_type": "bool",
+        "ui_type": "toggle"
+      },
       {
         "key": "DisableWideRoad",
         "label": "Disable Wide Road Camera",
diff --git a/starpilot/system/the_galaxy/tests/test_navigation_params.py b/starpilot/system/the_galaxy/tests/test_navigation_params.py
index 849b0edd1..04e3a7139 100644
--- a/starpilot/system/the_galaxy/tests/test_navigation_params.py
+++ b/starpilot/system/the_galaxy/tests/test_navigation_params.py
@@ -43,6 +43,43 @@ class FakeParamsBackend:
     return self.values.get(key)
 
 
+class WritableFakeParams:
+  def __init__(self, values=None):
+    self.values = dict(values or {})
+    self.writes = []
+
+  def get(self, key, encoding=None, default=None, block=False):
+    del encoding, block
+    return self.values.get(key, default)
+
+  def get_bool(self, key):
+    value = self.values.get(key, False)
+    if isinstance(value, bool):
+      return value
+    return str(value).strip().lower() in ("1", "true", "yes", "on")
+
+  def put(self, key, value):
+    self.writes.append((key, value))
+    self.values[key] = value
+
+  def put_bool(self, key, value):
+    self.writes.append((key, bool(value)))
+    self.values[key] = bool(value)
+
+
+def _params_client(monkeypatch, values, device_type):
+  fake_params = WritableFakeParams(values)
+  monkeypatch.setattr(the_galaxy, "params", fake_params)
+  monkeypatch.setattr(the_galaxy, "_get_param_type_info", lambda: ({"TryRaylibUI"}, {"TryRaylibUI": bool}))
+  monkeypatch.setattr(the_galaxy.HARDWARE, "get_device_type", lambda: device_type)
+  monkeypatch.setattr(the_galaxy.Paths, "comma_home", lambda: "/tmp/dashboard-test-home", raising=False)
+
+  assert the_galaxy._import_galaxy_web_symbols()
+  app = the_galaxy.Flask(f"params_test_{device_type}")
+  the_galaxy.setup(app)
+  return app.test_client(), fake_params
+
+
 def test_params_compat_accepts_json_strings_for_json_keys():
   backend = FakeParamsBackend(
     key_types={"FavoriteDestinations": ParamKeyType.JSON},
@@ -117,3 +154,38 @@ def test_galaxy_session_value_matches_cookie_format():
     "testGalaxySlug01",
     "a" * 64,
   ) == f"testGalaxySlug01%3A{'a' * 64}"
+
+
+def test_try_raylib_ui_is_noop_on_c4_mici(monkeypatch):
+  client, fake_params = _params_client(monkeypatch, {"TryRaylibUI": False, "IsOnroad": False}, "mici")
+
+  response = client.put("/api/params", json={"key": "TryRaylibUI", "value": True})
+  payload = response.get_json()
+
+  assert response.status_code == 200
+  assert payload["updated"] == {"TryRaylibUI": False}
+  assert fake_params.values["TryRaylibUI"] is False
+  assert fake_params.writes == []
+
+
+def test_try_raylib_ui_writes_on_big_device_offroad(monkeypatch):
+  client, fake_params = _params_client(monkeypatch, {"TryRaylibUI": False, "IsOnroad": False}, "tici")
+
+  response = client.put("/api/params", json={"key": "TryRaylibUI", "value": True})
+  payload = response.get_json()
+
+  assert response.status_code == 200
+  assert payload["updated"] == {"TryRaylibUI": True}
+  assert fake_params.values["TryRaylibUI"] is True
+  assert fake_params.writes == [("TryRaylibUI", True)]
+
+
+def test_try_raylib_ui_rejects_big_device_onroad_change(monkeypatch):
+  client, fake_params = _params_client(monkeypatch, {"TryRaylibUI": False, "IsOnroad": True}, "tici")
+
+  response = client.put("/api/params", json={"key": "TryRaylibUI", "value": True})
+
+  assert response.status_code == 403
+  assert response.get_json()["error"] == "Cannot change Try raylib UI while driving."
+  assert fake_params.values["TryRaylibUI"] is False
+  assert fake_params.writes == []
diff --git a/starpilot/system/the_galaxy/the_galaxy.py b/starpilot/system/the_galaxy/the_galaxy.py
index 913bfaed4..de83632b8 100644
--- a/starpilot/system/the_galaxy/the_galaxy.py
+++ b/starpilot/system/the_galaxy/the_galaxy.py
@@ -147,6 +147,13 @@ def _is_comma_device_runtime() -> bool:
     return False
 
 
+def _raylib_ui_toggle_affects_device() -> bool:
+  try:
+    return HARDWARE.get_device_type() in ("tici", "tizi")
+  except Exception:
+    return False
+
+
 def _get_param_key_type(params_obj, key):
   getter = getattr(params_obj, "get_key_type", None)
   if getter is None:
@@ -4163,6 +4170,24 @@ def setup(app):
       if key not in allowed_keys:
         return jsonify({"error": f"Parameter '{key}' is not editable."}), 403
 
+      if key == "TryRaylibUI":
+        enabled = str_val.strip() in ("1", "true", "True")
+        if not _raylib_ui_toggle_affects_device():
+          current_enabled = params.get_bool("TryRaylibUI")
+          return jsonify({
+            "message": "Try raylib UI is only available on tici/tizi devices.",
+            "updated": {"TryRaylibUI": current_enabled},
+          }), 200
+
+        if params.get_bool("IsOnroad"):
+          return jsonify({"error": "Cannot change Try raylib UI while driving."}), 403
+
+        params.put_bool("TryRaylibUI", enabled)
+        return jsonify({
+          "message": f"{'Raylib' if enabled else 'Qt'} UI selected. UI will restart shortly.",
+          "updated": {"TryRaylibUI": enabled},
+        }), 200
+
       # 1. Prevent changing the model or reboot-required toggles while the car is actively driving
       reboot_keys = {"Model", "DrivingModel", "AlwaysOnLateral", "DisableOpenpilotLongitudinal", "ForceTorqueController", "NNFF", "NNFFLite"}
       if key in reboot_keys and params.get_bool("IsOnroad"):
diff --git a/system/manager/process_config.py b/system/manager/process_config.py
index 6f6bee01b..2dd15c05b 100644
--- a/system/manager/process_config.py
+++ b/system/manager/process_config.py
@@ -1,6 +1,7 @@
 import os
 import operator
 import platform
+import sys
 
 from types import SimpleNamespace
 
@@ -83,6 +84,86 @@ def run_speed_limit_vision(started: bool, params: Params, CP: car.CarParams, sta
 def run_navigationd(started: bool, params: Params, CP: car.CarParams, starpilot_toggles: SimpleNamespace) -> bool:
   return started and params.get("NavDestination") is not None
 
+
+class BigDeviceUIProcess:
+  name = "ui"
+  enabled = True
+  sigkill = False
+  daemon = False
+
+  def __init__(self, should_run, watchdog_max_dt=None):
+    self.should_run_fn = should_run
+    self.watchdog_max_dt = watchdog_max_dt
+    self._started = False
+    self._params = None
+    self._active_process = None
+    self._qt_process = NativeProcess("ui", "selfdrive/ui", ["./ui"], should_run, watchdog_max_dt=watchdog_max_dt)
+    self._raylib_process = NativeProcess(
+      "ui",
+      ".",
+      ["/usr/bin/env", "BIG=1", sys.executable, "-m", "openpilot.selfdrive.ui.ui"],
+      should_run,
+      watchdog_max_dt=watchdog_max_dt,
+    )
+
+  @property
+  def proc(self):
+    return self._active_process.proc if self._active_process is not None else None
+
+  @property
+  def shutting_down(self):
+    return self._active_process.shutting_down if self._active_process is not None else False
+
+  def prepare(self) -> None:
+    self._qt_process.prepare()
+
+  def should_run(self, started: bool, params: Params, CP: car.CarParams, starpilot_toggles: SimpleNamespace) -> bool:
+    self._started = started
+    self._params = params
+    return self.should_run_fn(started, params, CP, starpilot_toggles)
+
+  def _desired_process(self):
+    return self._raylib_process if self._params is not None and self._params.get_bool("TryRaylibUI") else self._qt_process
+
+  def start(self) -> None:
+    desired_process = self._desired_process()
+
+    # Never swap UI implementations mid-drive. Direct param writes while onroad
+    # take effect the next time the device is offroad.
+    if self._started and self._active_process is not None and self._active_process is not desired_process:
+      desired_process = self._active_process
+
+    if self._active_process is not None and self._active_process is not desired_process:
+      self._active_process.stop()
+
+    for process in (self._qt_process, self._raylib_process):
+      if process is not desired_process and process.proc is not None:
+        process.stop()
+
+    self._active_process = desired_process
+    self._active_process.start()
+
+  def stop(self, retry: bool = True, block: bool = True, sig=None):
+    ret = None
+    for process in (self._qt_process, self._raylib_process):
+      process_ret = process.stop(retry=retry, block=block, sig=sig)
+      if process is self._active_process:
+        ret = process_ret
+    return ret
+
+  def restart(self) -> None:
+    self.stop()
+    self.start()
+
+  def check_watchdog(self, started: bool) -> None:
+    if self._active_process is not None:
+      self._active_process.check_watchdog(started)
+
+  def get_process_state_msg(self):
+    process = self._active_process or self._qt_process
+    return process.get_process_state_msg()
+
+
 procs = [
   DaemonProcess("manage_athenad", "system.athena.manage_athenad", "AthenadPid"),
 
@@ -145,9 +226,9 @@ procs += [
 
 device_type = HARDWARE.get_device_type()
 if device_type in ("tici", "tizi"):
-  procs.append(NativeProcess("ui", "selfdrive/ui", ["./ui"], always_run, watchdog_max_dt=UI_WATCHDOG_MAX_DT))
+  procs.append(BigDeviceUIProcess(always_run, watchdog_max_dt=UI_WATCHDOG_MAX_DT))
 else:
-  # C4 (mici) runs the Python raylib UI path.
+  # C4 (mici) already runs the Python raylib UI path; TryRaylibUI must not affect it.
   procs.append(PythonProcess("ui", "selfdrive.ui.ui", always_run, watchdog_max_dt=UI_WATCHDOG_MAX_DT))
 
 procs += [
diff --git a/system/manager/test/test_manager.py b/system/manager/test/test_manager.py
index fb6447de2..dd5f3e582 100644
--- a/system/manager/test/test_manager.py
+++ b/system/manager/test/test_manager.py
@@ -4,12 +4,13 @@ import signal
 import time
 from pathlib import Path
 import json
+from types import SimpleNamespace
 
 from cereal import car
 from openpilot.common.params import Params
 import openpilot.system.manager.manager as manager
 from openpilot.system.manager.process import ensure_running
-from openpilot.system.manager.process_config import managed_processes, procs
+from openpilot.system.manager.process_config import BigDeviceUIProcess, managed_processes, procs
 from openpilot.system.hardware import HARDWARE
 
 os.environ['FAKEUPLOAD'] = "1"
@@ -71,6 +72,40 @@ class FileBackedFakeParams:
     self.put(key, float(value))
 
 
+class FakeManagedProcess:
+  def __init__(self):
+    self.proc = None
+    self.shutting_down = False
+    self.starts = 0
+    self.stops = 0
+
+  def prepare(self):
+    pass
+
+  def start(self):
+    if self.proc is not None:
+      return
+
+    self.starts += 1
+    self.shutting_down = False
+    self.proc = SimpleNamespace(exitcode=None, pid=self.starts, is_alive=lambda: True)
+
+  def stop(self, retry=True, block=True, sig=None):
+    if self.proc is None:
+      return None
+
+    self.stops += 1
+    self.shutting_down = False
+    self.proc = None
+    return 0
+
+  def check_watchdog(self, started):
+    pass
+
+  def get_process_state_msg(self):
+    return SimpleNamespace(name="ui")
+
+
 class TestManager:
   def setup_method(self):
     HARDWARE.set_power_save(False)
@@ -96,6 +131,34 @@ class TestManager:
     assert names.index("the_galaxy") < ui_idx
     assert names.index("galaxy") < ui_idx
 
+  def test_big_device_ui_process_swaps_offroad_only(self, tmp_path):
+    ui_process = BigDeviceUIProcess(lambda *args: True)
+    qt_process = FakeManagedProcess()
+    raylib_process = FakeManagedProcess()
+    ui_process._qt_process = qt_process
+    ui_process._raylib_process = raylib_process
+
+    params = FileBackedFakeParams(tmp_path / "params", {"TryRaylibUI": False})
+
+    assert ui_process.should_run(False, params, car.CarParams.new_message(), SimpleNamespace())
+    ui_process.start()
+    assert ui_process.proc is qt_process.proc
+    assert qt_process.starts == 1
+    assert raylib_process.starts == 0
+
+    params.put_bool("TryRaylibUI", True)
+    assert ui_process.should_run(True, params, car.CarParams.new_message(), SimpleNamespace())
+    ui_process.start()
+    assert ui_process.proc is qt_process.proc
+    assert qt_process.stops == 0
+    assert raylib_process.starts == 0
+
+    assert ui_process.should_run(False, params, car.CarParams.new_message(), SimpleNamespace())
+    ui_process.start()
+    assert qt_process.stops == 1
+    assert raylib_process.starts == 1
+    assert ui_process.proc is raylib_process.proc
+
   def test_blacklisted_procs(self):
     # TODO: ensure there are blacklisted procs until we have a dedicated test
     assert len(BLACKLIST_PROCS), "No blacklisted procs to test not_run"