diff --git a/.ci/manager_windows/install_manager.bat b/.ci/manager_windows/install_manager.bat
new file mode 100644
index 000000000000..56dfa1c4598f
--- /dev/null
+++ b/.ci/manager_windows/install_manager.bat
@@ -0,0 +1,4 @@
+@echo off
+..\python_embeded\python.exe .\install_manager.py ..\ComfyUI\
+echo Installed manager through pip package, if not already installed.
+pause
\ No newline at end of file
diff --git a/.ci/manager_windows/install_manager.py b/.ci/manager_windows/install_manager.py
new file mode 100644
index 000000000000..db991d984e42
--- /dev/null
+++ b/.ci/manager_windows/install_manager.py
@@ -0,0 +1,24 @@
+import sys
+import os
+
+repo_path = str(sys.argv[1])
+repo_manager_req_path = os.path.join(repo_path, "manager_requirements.txt")
+
+if os.path.exists(repo_manager_req_path):
+    import subprocess
+    # if not installed, we get 'WARNING: Package(s) not found: comfyui_manager'
+    # if installed, there will be a line like 'Version: 0.1.0' = False
+    try:
+        output = subprocess.check_output([sys.executable, '-s', '-m', 'pip', 'show', 'comfyui_manager'])
+        if 'Version:' in output.decode('utf-8'):
+            print("comfyui_manager is already installed, will attempt to update to matching version of ComfyUI.")  # noqa: T201
+        else:
+            print("comfyui_manager is not installed, will install it now.")  # noqa: T201
+    except:
+        pass
+
+    try:
+        subprocess.check_call([sys.executable, '-s', '-m', 'pip', 'install', '-r', repo_manager_req_path])
+        print("comfyui_manager installed successfully.")  # noqa: T201
+    except:
+        print("Failed to install comfyui_manager, please install it manually.")  # noqa: T201
diff --git a/.ci/update_windows/update.py b/.ci/update_windows/update.py
index 51a263203d82..4a202786d9af 100755
--- a/.ci/update_windows/update.py
+++ b/.ci/update_windows/update.py
@@ -114,6 +114,8 @@ def latest_tag(repo):
 req_path = os.path.join(cur_path, "current_requirements.txt")
 repo_req_path = os.path.join(repo_path, "requirements.txt")
 
+manager_req_path = os.path.join(cur_path, "current_manager_requirements.txt")
+repo_manager_req_path = os.path.join(repo_path, "manager_requirements.txt")
 
 def files_equal(file1, file2):
     try:
@@ -140,6 +142,25 @@ def file_size(f):
     except:
         pass
 
+if os.path.exists(repo_manager_req_path) and (not os.path.exists(manager_req_path) or not files_equal(repo_manager_req_path, manager_req_path)):
+    import subprocess
+    # first, confirm that comfyui_manager package is installed; only update it if it is
+    # if not installed, we get 'WARNING: Package(s) not found: comfyui_manager'
+    # if installed, there will be a line like 'Version: 0.1.0'
+    update_manager = False
+    try:
+        output = subprocess.check_output([sys.executable, '-s', '-m', 'pip', 'show', 'comfyui_manager'])
+        if 'Version:' in output.decode('utf-8'):
+            update_manager = True
+    except:
+        pass
+
+    if update_manager:
+        try:
+            subprocess.check_call([sys.executable, '-s', '-m', 'pip', 'install', '-r', repo_manager_req_path])
+            shutil.copy(repo_manager_req_path, manager_req_path)
+        except:
+            pass
 
 stable_update_script = os.path.join(repo_path, ".ci/update_windows/update_comfyui_stable.bat")
 stable_update_script_to = os.path.join(cur_path, "update_comfyui_stable.bat")
diff --git a/.ci/windows_amd_base_files/run_amd_gpu.bat b/.ci/windows_amd_base_files/run_amd_gpu.bat
index 274d7c9486e0..a911d7a57185 100755
--- a/.ci/windows_amd_base_files/run_amd_gpu.bat
+++ b/.ci/windows_amd_base_files/run_amd_gpu.bat
@@ -1,2 +1,2 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build
+.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --enable-manager
 pause
diff --git a/.ci/windows_amd_base_files/run_amd_gpu_disable_smart_memory.bat b/.ci/windows_amd_base_files/run_amd_gpu_disable_smart_memory.bat
index cece0aeb20b5..1c382477f435 100755
--- a/.ci/windows_amd_base_files/run_amd_gpu_disable_smart_memory.bat
+++ b/.ci/windows_amd_base_files/run_amd_gpu_disable_smart_memory.bat
@@ -1,2 +1,2 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --disable-smart-memory
+.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --enable-manager --disable-smart-memory
 pause
diff --git a/.ci/windows_nightly_base_files/run_nvidia_gpu_fast.bat b/.ci/windows_nightly_base_files/run_nvidia_gpu_fast.bat
index ca6d6868af4e..67aaee88f340 100644
--- a/.ci/windows_nightly_base_files/run_nvidia_gpu_fast.bat
+++ b/.ci/windows_nightly_base_files/run_nvidia_gpu_fast.bat
@@ -1,2 +1,2 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --fast
+.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --enable-manager --fast
 pause
diff --git a/.ci/windows_nvidia_base_files/advanced/run_nvidia_gpu_disable_api_nodes.bat b/.ci/windows_nvidia_base_files/advanced/run_nvidia_gpu_disable_api_nodes.bat
index ed00583b62f2..f6dcd3eb6614 100644
--- a/.ci/windows_nvidia_base_files/advanced/run_nvidia_gpu_disable_api_nodes.bat
+++ b/.ci/windows_nvidia_base_files/advanced/run_nvidia_gpu_disable_api_nodes.bat
@@ -1,3 +1,3 @@
-..\python_embeded\python.exe -s ..\ComfyUI\main.py --windows-standalone-build --disable-api-nodes
+..\python_embeded\python.exe -s ..\ComfyUI\main.py --windows-standalone-build --enable-manager --disable-api-nodes
 echo If you see this and ComfyUI did not start try updating your Nvidia Drivers to the latest.
 pause
diff --git a/.ci/windows_nvidia_base_files/run_cpu.bat b/.ci/windows_nvidia_base_files/run_cpu.bat
index c3ba4172161a..366317779fc3 100755
--- a/.ci/windows_nvidia_base_files/run_cpu.bat
+++ b/.ci/windows_nvidia_base_files/run_cpu.bat
@@ -1,2 +1,2 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --cpu --windows-standalone-build
+.\python_embeded\python.exe -s ComfyUI\main.py --cpu --windows-standalone-build --enable-manager
 pause
diff --git a/.ci/windows_nvidia_base_files/run_nvidia_gpu.bat b/.ci/windows_nvidia_base_files/run_nvidia_gpu.bat
index 4898a424f4fc..02f86eea05a8 100755
--- a/.ci/windows_nvidia_base_files/run_nvidia_gpu.bat
+++ b/.ci/windows_nvidia_base_files/run_nvidia_gpu.bat
@@ -1,3 +1,3 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build
+.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --enable-manager
 echo If you see this and ComfyUI did not start try updating your Nvidia Drivers to the latest.
 pause
diff --git a/.ci/windows_nvidia_base_files/run_nvidia_gpu_fast_fp16_accumulation.bat b/.ci/windows_nvidia_base_files/run_nvidia_gpu_fast_fp16_accumulation.bat
index 32611e4affd8..69692e82f93a 100644
--- a/.ci/windows_nvidia_base_files/run_nvidia_gpu_fast_fp16_accumulation.bat
+++ b/.ci/windows_nvidia_base_files/run_nvidia_gpu_fast_fp16_accumulation.bat
@@ -1,3 +1,3 @@
-.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --fast fp16_accumulation
+.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build --enable-manager --fast fp16_accumulation
 echo If you see this and ComfyUI did not start try updating your Nvidia Drivers to the latest.
 pause
diff --git a/comfy/cli_args.py b/comfy/cli_args.py
index d2b60e347eff..1c8ef0c1fcbb 100644
--- a/comfy/cli_args.py
+++ b/comfy/cli_args.py
@@ -121,6 +121,12 @@ class LatentPreviewMethod(enum.Enum):
 upcast.add_argument("--dont-upcast-attention", action="store_true", help="Disable all upcasting of attention. Should be unnecessary except for debugging.")
 
 
+parser.add_argument("--enable-manager", action="store_true", help="Enable the ComfyUI-Manager feature.")
+manager_group = parser.add_mutually_exclusive_group()
+manager_group.add_argument("--disable-manager-ui", action="store_true", help="Disables only the ComfyUI-Manager UI and endpoints. Scheduled installations and similar background tasks will still operate.")
+manager_group.add_argument("--enable-manager-legacy-ui", action="store_true", help="Enables the legacy UI of ComfyUI-Manager")
+
+
 vram_group = parser.add_mutually_exclusive_group()
 vram_group.add_argument("--gpu-only", action="store_true", help="Store and run everything (text encoders/CLIP models, etc... on the GPU).")
 vram_group.add_argument("--highvram", action="store_true", help="By default models will be unloaded to CPU memory after being used. This option keeps them in GPU memory.")
@@ -167,6 +173,7 @@ class PerformanceFeature(enum.Enum):
 parser.add_argument("--verbose", default='INFO', const='DEBUG', nargs="?", choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'], help='Set the logging level')
 parser.add_argument("--log-stdout", action="store_true", help="Send normal process output to stdout instead of stderr (default).")
 
+
 # The default built-in provider hosted under web/
 DEFAULT_VERSION_STRING = "comfyanonymous/ComfyUI@latest"
 
diff --git a/comfy_api/feature_flags.py b/comfy_api/feature_flags.py
index 0d4389a6e9e7..bfb77eb5fa1f 100644
--- a/comfy_api/feature_flags.py
+++ b/comfy_api/feature_flags.py
@@ -13,6 +13,7 @@
 SERVER_FEATURE_FLAGS: Dict[str, Any] = {
     "supports_preview_metadata": True,
     "max_upload_size": args.max_upload_size * 1024 * 1024, # Convert MB to bytes
+    "extension": {"manager": {"supports_v4": True}},
 }
 
 
diff --git a/main.py b/main.py
index e1b0f1620bbc..0cd815d9e620 100644
--- a/main.py
+++ b/main.py
@@ -15,6 +15,7 @@
 from comfy_execution.utils import get_executing_context
 from comfy_api import feature_flags
 
+
 if __name__ == "__main__":
     #NOTE: These do not do anything on core ComfyUI, they are for custom nodes.
     os.environ['HF_HUB_DISABLE_TELEMETRY'] = '1'
@@ -22,6 +23,23 @@
 
 setup_logger(log_level=args.verbose, use_stdout=args.log_stdout)
 
+
+def handle_comfyui_manager_unavailable():
+    if not args.windows_standalone_build:
+        logging.warning(f"\n\nYou appear to be running comfyui-manager from source, this is not recommended. Please install comfyui-manager using the following command:\ncommand:\n\t{sys.executable} -m pip install --pre comfyui_manager\n")
+    args.enable_manager = False
+
+
+if args.enable_manager:
+    if importlib.util.find_spec("comfyui_manager"):
+        import comfyui_manager
+
+        if not comfyui_manager.__file__ or not comfyui_manager.__file__.endswith('__init__.py'):
+            handle_comfyui_manager_unavailable()
+    else:
+        handle_comfyui_manager_unavailable()
+
+
 def apply_custom_paths():
     # extra model paths
     extra_model_paths_config_path = os.path.join(os.path.dirname(os.path.realpath(__file__)), "extra_model_paths.yaml")
@@ -79,6 +97,11 @@ def execute_script(script_path):
 
         for possible_module in possible_modules:
             module_path = os.path.join(custom_node_path, possible_module)
+
+            if args.enable_manager:
+                if comfyui_manager.should_be_disabled(module_path):
+                    continue
+
             if os.path.isfile(module_path) or module_path.endswith(".disabled") or module_path == "__pycache__":
                 continue
 
@@ -101,6 +124,10 @@ def execute_script(script_path):
         logging.info("")
 
 apply_custom_paths()
+
+if args.enable_manager:
+    comfyui_manager.prestartup()
+
 execute_prestartup_script()
 
 
@@ -323,6 +350,9 @@ def start_comfyui(asyncio_loop=None):
         asyncio.set_event_loop(asyncio_loop)
     prompt_server = server.PromptServer(asyncio_loop)
 
+    if args.enable_manager and not args.disable_manager_ui:
+        comfyui_manager.start()
+
     hook_breaker_ac10a0.save_functions()
     asyncio_loop.run_until_complete(nodes.init_extra_nodes(
         init_custom_nodes=(not args.disable_all_custom_nodes) or len(args.whitelist_custom_nodes) > 0,
diff --git a/manager_requirements.txt b/manager_requirements.txt
new file mode 100644
index 000000000000..52cc5389cc3f
--- /dev/null
+++ b/manager_requirements.txt
@@ -0,0 +1 @@
+comfyui_manager==4.0.3b3
diff --git a/nodes.py b/nodes.py
index f4835c02e590..902468895347 100644
--- a/nodes.py
+++ b/nodes.py
@@ -43,6 +43,9 @@
 import latent_preview
 import node_helpers
 
+if args.enable_manager:
+    import comfyui_manager
+
 def before_node_execution():
     comfy.model_management.throw_exception_if_processing_interrupted()
 
@@ -2233,6 +2236,12 @@ async def init_external_custom_nodes():
             if args.disable_all_custom_nodes and possible_module not in args.whitelist_custom_nodes:
                 logging.info(f"Skipping {possible_module} due to disable_all_custom_nodes and whitelist_custom_nodes")
                 continue
+
+            if args.enable_manager:
+                if comfyui_manager.should_be_disabled(module_path):
+                    logging.info(f"Blocked by policy: {module_path}")
+                    continue
+
             time_before = time.perf_counter()
             success = await load_custom_node(module_path, base_node_names, module_parent="custom_nodes")
             node_import_times.append((time.perf_counter() - time_before, module_path, success))
diff --git a/server.py b/server.py
index 0fd2e49e34bf..6b8d94f3f07d 100644
--- a/server.py
+++ b/server.py
@@ -44,6 +44,9 @@
 # Import cache control middleware
 from middleware.cache_middleware import cache_control
 
+if args.enable_manager:
+    import comfyui_manager
+
 async def send_socket_catch_exception(function, message):
     try:
         await function(message)
@@ -212,6 +215,9 @@ def __init__(self, loop):
         if args.disable_api_nodes:
             middlewares.append(create_block_external_middleware())
 
+        if args.enable_manager:
+            middlewares.append(comfyui_manager.create_middleware())
+
         max_upload_size = round(args.max_upload_size * 1024 * 1024)
         self.app = web.Application(client_max_size=max_upload_size, middlewares=middlewares)
         self.sockets = dict()
@@ -599,7 +605,7 @@ async def system_stats(request):
 
             system_stats = {
                 "system": {
-                    "os": os.name,
+                    "os": sys.platform,
                     "ram_total": ram_total,
                     "ram_free": ram_free,
                     "comfyui_version": __version__,