diff --git a/judoscale/core/config.py b/judoscale/core/config.py
index cc120f4..40913c3 100644
--- a/judoscale/core/config.py
+++ b/judoscale/core/config.py
@@ -45,7 +45,9 @@ def __init__(
 
     @classmethod
     def initialize(cls, env: Mapping = os.environ):
-        if env.get("DYNO"):
+        if env.get("JUDOSCALE_CONTAINER"):
+            return cls.for_custom(env)
+        elif env.get("DYNO"):
             return cls.for_heroku(env)
         elif env.get("RENDER_INSTANCE_ID"):
             return cls.for_render(env)
@@ -56,7 +58,7 @@ def initialize(cls, env: Mapping = os.environ):
         elif env.get("RAILWAY_REPLICA_ID"):
             return cls.for_railway(env)
         else:
-            return cls.for_custom(env)
+            return cls.for_unknown(env)
 
     @classmethod
     def for_heroku(cls, env: Mapping):
@@ -93,6 +95,12 @@ def for_railway(cls, env: Mapping):
 
     @classmethod
     def for_custom(cls, env: Mapping):
+        runtime_container = RuntimeContainer(env["JUDOSCALE_CONTAINER"])
+        api_base_url = env.get("JUDOSCALE_URL")
+        return cls(runtime_container, api_base_url, env)
+
+    @classmethod
+    def for_unknown(cls, env: Mapping):
         return cls(RuntimeContainer(""), env.get("JUDOSCALE_URL"), env)
 
     @property
diff --git a/tests/test_config.py b/tests/test_config.py
index 3bcc1f7..da6b5a1 100644
--- a/tests/test_config.py
+++ b/tests/test_config.py
@@ -83,6 +83,27 @@ def test_on_railway(self):
         assert config["API_BASE_URL"] == "https://adapter.judoscale.com/api/1234567890"
 
     def test_on_custom(self):
+        fake_env = {
+            "JUDOSCALE_CONTAINER": "my-custom-container",
+            "JUDOSCALE_URL": "https://adapter.judoscale.com/api/1234567890",
+        }
+        config = Config.initialize(fake_env)
+
+        assert config["RUNTIME_CONTAINER"] == "my-custom-container"
+        assert config["LOG_LEVEL"] == "WARN"
+        assert config["API_BASE_URL"] == "https://adapter.judoscale.com/api/1234567890"
+
+    def test_on_custom_takes_precedence(self):
+        fake_env = {
+            "JUDOSCALE_CONTAINER": "my-custom-container",
+            "DYNO": "web.1",
+            "JUDOSCALE_URL": "https://adapter.judoscale.com/api/1234567890",
+        }
+        config = Config.initialize(fake_env)
+
+        assert config["RUNTIME_CONTAINER"] == "my-custom-container"
+
+    def test_on_unknown(self):
         fake_env = {"JUDOSCALE_URL": "https://adapter.judoscale.com/api/1234567890"}
         config = Config.initialize(fake_env)