diff --git a/docs/colliecting-diffs.md b/docs/colliecting-diffs.md
index e9a9bef..2d06982 100644
--- a/docs/colliecting-diffs.md
+++ b/docs/colliecting-diffs.md
@@ -56,6 +56,8 @@ You can define Jinja2 template with logic to use virtual chassis name if device
 {% if object.virtual_chassis %}{{ object.virtual_chassis.name }}-config{% else %}{{ object.name }}{% endif %}
 ```
 
+Also you can define custom field which stores actual configuration of devices.
+
 ![Screenshot of the script](media/screenshots/script.png)
 
 ## Results
diff --git a/docs/media/screenshots/script.png b/docs/media/screenshots/script.png
index ae14575..5d3db92 100644
Binary files a/docs/media/screenshots/script.png and b/docs/media/screenshots/script.png differ
diff --git a/netbox_config_diff/compliance/base.py b/netbox_config_diff/compliance/base.py
index 7096b2f..6a8871c 100644
--- a/netbox_config_diff/compliance/base.py
+++ b/netbox_config_diff/compliance/base.py
@@ -1,14 +1,16 @@
 import asyncio
+import inspect
 import re
 import traceback
 from typing import Iterable, Iterator
 
 from core.choices import DataSourceStatusChoices
-from core.models import DataFile, DataSource
+from core.models import DataFile, DataSource, ObjectType
 from dcim.choices import DeviceStatusChoices
 from dcim.models import Device, DeviceRole, Site
 from django.db.models import Q
-from extras.scripts import MultiObjectVar, ObjectVar, TextVar
+from extras.models import CustomField
+from extras.scripts import MultiObjectVar, ObjectVar, ScriptVariable, TextVar
 from jinja2.exceptions import TemplateError
 from netutils.config.compliance import diff_network_config
 from utilities.exceptions import AbortScript
@@ -52,12 +54,50 @@ class ConfigDiffBase(SecretsMixin):
         },
         description="Define synced DataSource, if you want compare configs stored in it wihout connecting to devices",
     )
+    custom_field = ObjectVar(
+        model=CustomField,
+        required=False,
+        query_params={
+            "type": ["longtext", "text"],
+            "object_type_id": None,
+        },
+        description="Define custom field which stores actual configuration of devices",
+    )
     name_template = TextVar(
         required=False,
         description="Jinja2 template code for the device name in Data source. "
         "Reference the object as <code>{{ object }}</code>.",
     )
 
+    @classmethod
+    def _get_device_object_type_id(cls) -> list[int]:
+        return list(ObjectType.objects.filter(app_label="dcim", model="device").values_list("id", flat=True))
+
+    @classmethod
+    def _get_vars(cls):
+        vars = {}
+        device_id = cls._get_device_object_type_id()
+
+        # Iterate all base classes looking for ScriptVariables
+        for base_class in inspect.getmro(cls):
+            # When object is reached there's no reason to continue
+            if base_class is object:
+                break
+
+            for name, attr in base_class.__dict__.items():
+                if name not in vars and issubclass(attr.__class__, ScriptVariable):
+                    if name == "custom_field":
+                        attr.field_attrs["query_params"]["object_type_id"] = device_id
+                    vars[name] = attr
+
+        # Order variables according to field_order
+        if not cls.field_order:
+            return vars
+        ordered_vars = {field: vars.pop(field) for field in cls.field_order if field in vars}
+        ordered_vars.update(vars)
+
+        return ordered_vars
+
     def run_script(self, data: dict) -> None:
         devices = self.validate_data(data)
         devices = list(self.get_devices_with_rendered_configs(devices))
@@ -164,6 +204,10 @@ def get_devices_with_rendered_configs(self, devices: Iterable[Device]) -> Iterat
                 device=device,
             )
 
+    def get_config_from_customfield(self, devices: list[ConplianceDeviceDataClass]) -> None:
+        for device in devices:
+            device.actual_config = device.device.cf[self.data["custom_field"].name]
+
     def get_config_from_datasource(self, devices: list[ConplianceDeviceDataClass]) -> None:
         for device in devices:
             if self.data["name_template"]:
@@ -185,6 +229,8 @@ def get_config_from_datasource(self, devices: list[ConplianceDeviceDataClass]) -
     def get_actual_configs(self, devices: list[ConplianceDeviceDataClass]) -> None:
         if self.data["data_source"]:
             self.get_config_from_datasource(devices)
+        elif self.data["custom_field"]:
+            self.get_config_from_customfield(devices)
         else:
             loop = asyncio.get_event_loop()
             loop.run_until_complete(asyncio.gather(*(d.get_actual_config() for d in devices)))
diff --git a/tests/conftest.py b/tests/conftest.py
index 9d699c3..e56d098 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -45,6 +45,7 @@ def __call__(self, **fields: Unpack[ScriptData]) -> "ScriptData":
 
 
 @pytest.fixture()
+@pytest.mark.django_db
 def mock_config_diff() -> ConfigDiffBase:
     mock_object = ConfigDiffBase
     mock_object.log_warning = Mock()