diff --git a/.gitignore b/.gitignore
index 807c1b8..1bbddce 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,8 +1,10 @@
 # Ignore test plots
 tests/plots
-
-# Ignore schema, which has absolute paths that will vary by system
-params_schema.json
+# Ignore schemas, which have absolute paths that will vary by system
+*schema.json
+# Ignore local dev environment settings
+*.env
+settings*.yaml
 
 # * -------------------------------------------------------------------------------- * #
 # * Template gitignore
diff --git a/.vscode/settings.json b/.vscode/settings.json
index c47d8c8..ab1e99c 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -2,7 +2,16 @@
   // * ----------------------------------------------------------------------------- * #
   //! Schema
   "yaml.schemas": {
-    "params_schema.json": "params.yaml"
+    "params_schema.json": "params.yaml",
+    // ? `boilercore`
+    "src/boilercore/settings_schema.json": "src/boilercore/settings.yaml",
+    "src/boilercore/settings_plugin_schema.json": "src/boilercore/settings_plugin.yaml",
+    // ? `boilercore_docs`
+    "docs/boilercore_docs/settings_schema.json": "docs/boilercore_docs/settings.yaml",
+    "docs/boilercore_docs/settings_plugin_schema.json": "docs/boilercore_docs/settings_plugin.yaml",
+    // ? `boilercore_tests`
+    "tests/boilercore_tests/settings_schema.json": "tests/boilercore_tests/settings.yaml",
+    "tests/boilercore_tests/settings_plugin_schema.json": "tests/boilercore_tests/settings_plugin.yaml"
   },
   // * ----------------------------------------------------------------------------- * #
   //! Terminal
diff --git a/docs/boilercore_docs/settings.py b/docs/boilercore_docs/settings.py
new file mode 100644
index 0000000..97da64f
--- /dev/null
+++ b/docs/boilercore_docs/settings.py
@@ -0,0 +1,60 @@
+"""Settings."""
+
+from pydantic_settings import (
+    BaseSettings,
+    PydanticBaseSettingsSource,
+    SettingsConfigDict,
+)
+
+import boilercore_docs
+from boilercore.settings_models import (
+    customise_sources,
+    get_settings_paths,
+    sync_settings_schema,
+)
+
+paths = get_settings_paths(boilercore_docs)
+
+
+class PluginModelConfig(BaseSettings):
+    """Pydantic plugin model configuration."""
+
+    model_config = SettingsConfigDict(use_attribute_docstrings=True)
+
+    @classmethod
+    def settings_customise_sources(
+        cls,
+        settings_cls: type[BaseSettings],
+        init_settings: PydanticBaseSettingsSource,
+        *_args: PydanticBaseSettingsSource,
+        **_kwds: PydanticBaseSettingsSource,
+    ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Source settings from init and TOML."""
+        return customise_sources(settings_cls, init_settings, paths.plugin_settings)
+
+
+class Settings(BaseSettings):
+    """Package settings."""
+
+    model_config = SettingsConfigDict(use_attribute_docstrings=True)
+
+    @classmethod
+    def settings_customise_sources(
+        cls,
+        settings_cls: type[BaseSettings],
+        init_settings: PydanticBaseSettingsSource,
+        *_args: PydanticBaseSettingsSource,
+        **_kwds: PydanticBaseSettingsSource,
+    ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Source  settings from init and TOML."""
+        return customise_sources(settings_cls, init_settings, paths.plugin_settings)
+
+
+for path, model in zip(
+    paths.all_dev_settings if paths.in_dev else paths.all_cwd_settings,
+    (PluginModelConfig, Settings),
+    strict=True,
+):
+    sync_settings_schema(path, model)
+
+default = Settings()
diff --git a/docs/pyproject.toml b/docs/pyproject.toml
index 649fb4f..c4fa0f2 100644
--- a/docs/pyproject.toml
+++ b/docs/pyproject.toml
@@ -34,6 +34,7 @@ dependencies = [
     "matplotlib>=3.7.2",
     "numpy>=1.24.4",
     "pandas[hdf5,performance]>=2.2.2",
+    "pydantic-settings>=2.4.0",
     "seaborn>=0.13.2",
     "sympy>=1.12",
 ]
diff --git a/src/boilercore/settings.py b/src/boilercore/settings.py
new file mode 100644
index 0000000..f83c853
--- /dev/null
+++ b/src/boilercore/settings.py
@@ -0,0 +1,58 @@
+"""Settings."""
+
+from pydantic_settings import (
+    BaseSettings,
+    PydanticBaseSettingsSource,
+    SettingsConfigDict,
+)
+
+import boilercore
+from boilercore.settings_models import (
+    customise_sources,
+    get_settings_paths,
+    sync_settings_schema,
+)
+
+paths = get_settings_paths(boilercore)
+
+
+class PluginModelConfig(BaseSettings):
+    """Pydantic plugin model configuration."""
+
+    @classmethod
+    def settings_customise_sources(
+        cls,
+        settings_cls: type[BaseSettings],
+        init_settings: PydanticBaseSettingsSource,
+        *_args: PydanticBaseSettingsSource,
+        **_kwds: PydanticBaseSettingsSource,
+    ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Source settings from init and TOML."""
+        return customise_sources(settings_cls, init_settings, paths.plugin_settings)
+
+
+class Settings(BaseSettings):
+    """Package settings."""
+
+    model_config = SettingsConfigDict(use_attribute_docstrings=True)
+
+    @classmethod
+    def settings_customise_sources(
+        cls,
+        settings_cls: type[BaseSettings],
+        init_settings: PydanticBaseSettingsSource,
+        *_args: PydanticBaseSettingsSource,
+        **_kwds: PydanticBaseSettingsSource,
+    ) -> tuple[PydanticBaseSettingsSource, ...]:
+        """Source settings from init and TOML."""
+        return customise_sources(settings_cls, init_settings, paths.settings)
+
+
+for path, model in zip(
+    paths.all_dev_settings if paths.in_dev else paths.all_cwd_settings,
+    (PluginModelConfig, Settings),
+    strict=True,
+):
+    sync_settings_schema(path, model)
+
+default = Settings()
diff --git a/src/boilercore/settings_models.py b/src/boilercore/settings_models.py
new file mode 100644
index 0000000..885cdd5
--- /dev/null
+++ b/src/boilercore/settings_models.py
@@ -0,0 +1,107 @@
+"""Settings models."""
+
+from collections.abc import Iterable
+from json import dumps
+from pathlib import Path
+from site import getsitepackages
+from types import ModuleType
+
+from pydantic import BaseModel
+from pydantic_settings import (
+    BaseSettings,
+    PydanticBaseSettingsSource,
+    YamlConfigSettingsSource,
+)
+
+from boilercore.paths import get_module_name, get_package_dir
+
+
+class Paths(BaseModel):
+    """Settings model paths."""
+
+    cwd_plugin_settings: Path
+    dev_plugin_settings: Path
+    plugin_settings: list[Path]
+
+    cwd_settings: Path
+    dev_settings: Path
+    settings: list[Path]
+
+    all_cwd_settings: list[Path]
+    all_dev_settings: list[Path]
+
+    in_dev: bool
+
+
+def get_settings_paths(module: ModuleType) -> Paths:
+    """Get settings model paths."""
+    package_dir = get_package_dir(module)
+    package_name = get_module_name(module)
+    return Paths(
+        cwd_plugin_settings=(
+            cwd_plugin_settings := Path.cwd() / f"{package_name}_plugin.yaml"
+        ),
+        dev_plugin_settings=(
+            dev_plugin_settings := package_dir / "settings_plugin.yaml"
+        ),
+        plugin_settings=[cwd_plugin_settings, dev_plugin_settings],
+        cwd_settings=(cwd_settings := Path.cwd() / Path(f"{package_name}.yaml")),
+        dev_settings=(dev_settings := package_dir / "settings.yaml"),
+        settings=[cwd_settings, dev_settings],
+        all_cwd_settings=[cwd_plugin_settings, cwd_settings],
+        all_dev_settings=[dev_plugin_settings, dev_settings],
+        in_dev=not (
+            getsitepackages() and package_dir.is_relative_to(Path(getsitepackages()[0]))
+        ),
+    )
+
+
+def get_yaml_sources(
+    settings_cls: type[BaseSettings], paths: Iterable[Path], encoding: str = "utf-8"
+) -> tuple[YamlConfigSettingsSource, ...]:
+    """Source settings from init and TOML."""
+    sources: list[YamlConfigSettingsSource] = []
+    for yaml_file in paths:
+        source = YamlConfigSettingsSource(
+            settings_cls, yaml_file, yaml_file_encoding=encoding
+        )
+        if source.init_kwargs.get("$schema"):
+            del source.init_kwargs["$schema"]
+        sources.append(source)
+    return tuple(sources)
+
+
+def customise_sources(
+    settings_cls: type[BaseSettings],
+    init_settings: PydanticBaseSettingsSource,
+    yaml_files: Iterable[Path],
+    encoding: str = "utf-8",
+):
+    """Source settings from init and YAML."""
+    return (init_settings, *get_yaml_sources(settings_cls, yaml_files, encoding))
+
+
+def get_plugin_settings(
+    package_name: str, config: BaseSettings
+) -> dict[str, BaseSettings]:
+    """Get Pydantic plugin model configuration.
+
+    ```Python
+    model_config = SettingsConfigDict(
+        plugin_settings={"boilercv_docs": PluginModelConfig()}
+    )
+    ```
+    """
+    return {package_name: config}
+
+
+def sync_settings_schema(
+    path: Path, model: type[BaseModel], encoding: str = "utf-8"
+) -> None:
+    """Create settings file and update its schema."""
+    if not path.exists():
+        path.touch()
+    schema = path.with_name(f"{path.stem}_schema.json")
+    schema.write_text(
+        encoding=encoding, data=f"{dumps(model.model_json_schema(), indent=2)}\n"
+    )