diff --git a/src/array_api_extra/_lib/_utils/_compat.py b/src/array_api_extra/_lib/_utils/_compat.py
index b9997450..c6eec4cd 100644
--- a/src/array_api_extra/_lib/_utils/_compat.py
+++ b/src/array_api_extra/_lib/_utils/_compat.py
@@ -23,6 +23,7 @@
         is_torch_namespace,
         is_writeable_array,
         size,
+        to_device,
     )
 except ImportError:
     from array_api_compat import (
@@ -45,6 +46,7 @@
         is_torch_namespace,
         is_writeable_array,
         size,
+        to_device,
     )
 
 __all__ = [
@@ -67,4 +69,5 @@
     "is_torch_namespace",
     "is_writeable_array",
     "size",
+    "to_device",
 ]
diff --git a/src/array_api_extra/_lib/_utils/_compat.pyi b/src/array_api_extra/_lib/_utils/_compat.pyi
index f40d7556..48addda4 100644
--- a/src/array_api_extra/_lib/_utils/_compat.pyi
+++ b/src/array_api_extra/_lib/_utils/_compat.pyi
@@ -4,6 +4,7 @@
 from __future__ import annotations
 
 from types import ModuleType
+from typing import Any, TypeGuard
 
 # TODO import from typing (requires Python >=3.13)
 from typing_extensions import TypeIs
@@ -12,29 +13,33 @@ from ._typing import Array, Device
 
 # pylint: disable=missing-class-docstring,unused-argument
 
-class Namespace(ModuleType):
-    def device(self, x: Array, /) -> Device: ...
-
 def array_namespace(
     *xs: Array | complex | None,
     api_version: str | None = None,
     use_compat: bool | None = None,
-) -> Namespace: ...
+) -> ModuleType: ...
 def device(x: Array, /) -> Device: ...
 def is_array_api_obj(x: object, /) -> TypeIs[Array]: ...
-def is_array_api_strict_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_cupy_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_dask_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_jax_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_numpy_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_pydata_sparse_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_torch_namespace(xp: ModuleType, /) -> TypeIs[Namespace]: ...
-def is_cupy_array(x: object, /) -> TypeIs[Array]: ...
-def is_dask_array(x: object, /) -> TypeIs[Array]: ...
-def is_jax_array(x: object, /) -> TypeIs[Array]: ...
-def is_numpy_array(x: object, /) -> TypeIs[Array]: ...
-def is_pydata_sparse_array(x: object, /) -> TypeIs[Array]: ...
-def is_torch_array(x: object, /) -> TypeIs[Array]: ...
-def is_lazy_array(x: object, /) -> TypeIs[Array]: ...
-def is_writeable_array(x: object, /) -> TypeIs[Array]: ...
+def is_array_api_strict_namespace(xp: ModuleType, /) -> bool: ...
+def is_cupy_namespace(xp: ModuleType, /) -> bool: ...
+def is_dask_namespace(xp: ModuleType, /) -> bool: ...
+def is_jax_namespace(xp: ModuleType, /) -> bool: ...
+def is_numpy_namespace(xp: ModuleType, /) -> bool: ...
+def is_pydata_sparse_namespace(xp: ModuleType, /) -> bool: ...
+def is_torch_namespace(xp: ModuleType, /) -> bool: ...
+def is_cupy_array(x: object, /) -> TypeGuard[Array]: ...
+def is_dask_array(x: object, /) -> TypeGuard[Array]: ...
+def is_jax_array(x: object, /) -> TypeGuard[Array]: ...
+def is_numpy_array(x: object, /) -> TypeGuard[Array]: ...
+def is_pydata_sparse_array(x: object, /) -> TypeGuard[Array]: ...
+def is_torch_array(x: object, /) -> TypeGuard[Array]: ...
+def is_lazy_array(x: object, /) -> TypeGuard[Array]: ...
+def is_writeable_array(x: object, /) -> TypeGuard[Array]: ...
 def size(x: Array, /) -> int | None: ...
+def to_device(  # type: ignore[explicit-any]
+    x: Array,
+    device: Device,  # pylint: disable=redefined-outer-name
+    /,
+    *,
+    stream: int | Any | None = None,
+) -> Array: ...
diff --git a/vendor_tests/test_vendor.py b/vendor_tests/test_vendor.py
index 4613edc7..374cba11 100644
--- a/vendor_tests/test_vendor.py
+++ b/vendor_tests/test_vendor.py
@@ -23,11 +23,12 @@ def test_vendor_compat():
         is_torch_namespace,
         is_writeable_array,
         size,
+        to_device,
     )
 
     x = xp.asarray([1, 2, 3])
     assert array_namespace(x) is xp
-    device(x)
+    to_device(x, device(x))
     assert is_array_api_obj(x)
     assert is_array_api_strict_namespace(xp)
     assert not is_cupy_array(x)