diff --git a/clams/appmetadata/__init__.py b/clams/appmetadata/__init__.py
index 9ef5544..b5307c8 100644
--- a/clams/appmetadata/__init__.py
+++ b/clams/appmetadata/__init__.py
@@ -295,6 +295,10 @@ class AppMetadata(pydantic.BaseModel):
         None, 
         description="(optional) Version of an analyzer software, if the app is working as a wrapper for one. "
     )
+    analyzer_versions: Optional[Dict[str, str]] = pydantic.Field(
+        None,
+        description="(optional) Map of analyzer IDs to their versions, for apps that wrap multiple models or families."
+    )
     app_license: str = pydantic.Field(
         ..., 
         description="License information of the app."
diff --git a/tests/test_appmetadata.py b/tests/test_appmetadata.py
new file mode 100644
index 0000000..671e587
--- /dev/null
+++ b/tests/test_appmetadata.py
@@ -0,0 +1,97 @@
+import unittest
+from pydantic import ValidationError
+from clams.appmetadata import AppMetadata
+
+class TestAppMetadata(unittest.TestCase):
+    def test_analyzer_version_simple(self):
+        # valid cases
+        valid_versions = [
+            "1.0.0",
+            "v1.2",
+            "hf-250619", # Should be allowed as simple string without validation
+            None
+        ]
+
+        for v in valid_versions:
+            try:
+                AppMetadata(
+                    name="test",
+                    description="test",
+                    app_license="MIT",
+                    identifier="http://test",
+                    url="http://test",
+                    analyzer_version=v
+                )
+            except ValidationError as e:
+                self.fail(f"Valid version '{v}' failed validation: {e}")
+
+    def test_analyzer_versions_map(self):
+        # test analyzer_versions field
+
+        # case 1: simple valid map
+        versions_map = {
+            "model1": "1.0.0",
+            "model2": "commit-hash-123"
+        }
+
+        m = AppMetadata(
+            name="test",
+            description="test",
+            app_license="MIT",
+            identifier="http://test",
+            url="http://test",
+            analyzer_versions=versions_map
+        )
+        self.assertEqual(m.analyzer_versions, versions_map)
+
+        # case 2: mixed with singular analyzer_version (technically allowed by pydantic, logic separation is up to user)
+        m2 = AppMetadata(
+            name="test",
+            description="test",
+            app_license="MIT",
+            identifier="http://test",
+            url="http://test",
+            analyzer_version="1.0",
+            analyzer_versions=versions_map
+        )
+        self.assertEqual(m2.analyzer_versions, versions_map)
+        self.assertEqual(m2.analyzer_version, "1.0")
+
+    def test_analyzer_versions_invalid(self):
+        # invalid type for analyzer_versions
+        invalid_map = "not a map"
+
+        with self.assertRaises(ValidationError):
+            AppMetadata(
+                name="test",
+                description="test",
+                app_license="MIT",
+                identifier="http://test",
+                url="http://test",
+                analyzer_versions=invalid_map
+            )
+
+    def test_analyzer_versions_invalid_values(self):
+        # invalid values in map (must be strings)
+        invalid_map = {
+            "model1": 1.0  # int, might be coerced to string by pydantic? let's see. Pydantic usually coerces.
+        }
+        # If pydantic coerces, this might pass. Let's check strictness if needed.
+        # The field is Dict[str, str]. Pydantic v2 usually coerces unless configured otherwise.
+
+        # Let's test checking list as value, which should fail for Dict[str, str]
+        invalid_map_list = {
+            "model1": ["1.0"]
+        }
+        with self.assertRaises(ValidationError):
+            AppMetadata(
+                name="test",
+                description="test",
+                app_license="MIT",
+                identifier="http://test",
+                url="http://test",
+                analyzer_versions=invalid_map_list
+            )
+
+if __name__ == '__main__':
+    unittest.main()