diff --git a/i18n_guardian/detectors/base.py b/i18n_guardian/detectors/base.py
new file mode 100644
index 0000000..c7379da
--- /dev/null
+++ b/i18n_guardian/detectors/base.py
@@ -0,0 +1,76 @@
+"""Base detector interface and registry."""
+
+from abc import ABC, abstractmethod
+from pathlib import Path
+from typing import Dict, List, Optional
+
+
+class Detector(ABC):
+    """Base class for i18n library detectors."""
+
+    @property
+    @abstractmethod
+    def name(self) -> str:
+        """Detector name."""
+        pass
+
+    @property
+    @abstractmethod
+    def patterns(self) -> List[str]:
+        """File patterns to scan."""
+        pass
+
+    @abstractmethod
+    def detect(self, path: Path) -> Optional[str]:
+        """Detect if the i18n library is used."""
+        pass
+
+    @abstractmethod
+    def get_i18n_functions(self) -> List[str]:
+        """Get list of i18n function names."""
+        pass
+
+
+class DetectorRegistry:
+    """Registry for i18n library detectors."""
+
+    def __init__(self) -> None:
+        self._detectors: Dict[str, Detector] = {}
+
+    def register(self, detector: Detector) -> None:
+        """Register a detector."""
+        self._detectors[detector.name] = detector
+
+    def get(self, name: str) -> Optional[Detector]:
+        """Get a detector by name."""
+        return self._detectors.get(name)
+
+    def detect_library(self, path: Path) -> Optional[str]:
+        """Detect which i18n library is used in the path."""
+        for detector in self._detectors.values():
+            if detector.detect(path):
+                return detector.name
+        return None
+
+    def list_detectors(self) -> List[str]:
+        """List all registered detector names."""
+        return list(self._detectors.keys())
+
+
+def get_default_registry() -> DetectorRegistry:
+    """Get the default detector registry with all built-in detectors."""
+    registry = DetectorRegistry()
+
+    from i18n_guardian.detectors.react_intl import ReactIntlDetector
+    from i18n_guardian.detectors.i18next import I18NextDetector
+    from i18n_guardian.detectors.vue_i18n import VueI18nDetector
+    from i18n_guardian.detectors.gettext import GettextDetector
+    from i18n_guardian.detectors.python_gettext import PythonGettextDetector
+
+    registry.register(ReactIntlDetector())
+    registry.register(I18NextDetector())
+    registry.register(VueI18nDetector())
+    registry.register(GettextDetector())
+    registry.register(PythonGettextDetector())
+
+    return registry