diff --git a/examples/maqpi/manual_auth.py b/examples/maqpi/manual_auth.py
new file mode 100644
index 0000000..2cdaecf
--- /dev/null
+++ b/examples/maqpi/manual_auth.py
@@ -0,0 +1,16 @@
+"""A basic example of repl auth."""
+import simple
+
+app = simple.App("app")
+
+
+@app.route("/")
+def index():
+    if simple.signed_in:
+        return "Hello " + simple.auth.name
+    else:
+        return simple.signin()  # optionally: simple.sigin(title="My title")
+
+
+if __name__ == "__main__":
+    app.run()
diff --git a/src/replit/maqpi/__init__.py b/src/replit/maqpi/__init__.py
new file mode 100644
index 0000000..a6f61ce
--- /dev/null
+++ b/src/replit/maqpi/__init__.py
@@ -0,0 +1,20 @@
+"""Make apps quickly in python."""
+import os
+
+import flask
+from werkzeug.local import LocalProxy
+
+from . import html
+from .app import App
+from .html import Page, Paragraph
+from .utils import sign_in_snippet, signin
+
+# TODO: import new db package package name
+
+db = ReplitDb(os.environ["REPLIT_DB_URL"])
+auth = LocalProxy(lambda: flask.request.auth)
+signed_in = LocalProxy(lambda: flask.request.signed_in)
+
+# TODO: signinwall(exclude=['/a', '/b'])
+# TODO: @need_signin
+# TODO: Param checking with @needs_params
diff --git a/src/replit/maqpi/app.py b/src/replit/maqpi/app.py
new file mode 100644
index 0000000..f74aca0
--- /dev/null
+++ b/src/replit/maqpi/app.py
@@ -0,0 +1,77 @@
+"""Core of maqpi."""
+from dataclasses import dataclass
+from typing import Any
+
+import flask
+
+
+@dataclass
+class ReplitAuthContext:
+    """A dataclass defining a Repl Auth state."""
+
+    user_id: int
+    name: str
+    roles: str
+
+    @classmethod
+    def from_headers(cls, headers: dict):
+        """Initialize an instance using the Replit magic headers.
+
+        Args:
+            headers (dict): A dictionary of headers received
+
+        Returns:
+            [type]: An initialized class instance
+        """
+        return cls(
+            user_id=headers.get("X-Replit-User-Id"),
+            name=headers.get("X-Replit-User-Name"),
+            roles=headers.get("X-Replit-User-Roles"),
+        )
+
+    @property
+    def signed_in(self) -> bool:
+        """Return whether or not the authentication is activated."""
+        return self.name != ""
+
+
+class Request(flask.Request):
+    """Represents a client request."""
+
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        """Initialize request and run update_auth."""
+        super().__init__(*args, **kwargs)
+        self.update_auth()
+
+    def update_auth(self) -> None:
+        """Update the auth property to be a ReplitAuthContext."""
+        self.auth = ReplitAuthContext.from_headers(self.headers)
+
+    @property
+    def signed_in(self) -> bool:
+        """Return whether or not the authentication is activated."""
+        return self.auth.signed_in
+
+
+class App(flask.Flask):
+    """Represents a web application."""
+
+    request_class = Request
+
+    def all_pages_sign_in(self) -> None:
+        """Require sign-in on all pages."""
+        raise NotImplementedError()
+
+    def _run(self, *args: Any, **kwargs: Any) -> Any:
+        """Interface with the underlying flask instance's run function."""
+        return super().run(*args, **kwargs)
+
+    def run(self, port: int = 8080, localhost: bool = False) -> None:
+        """Run the app.
+
+        Args:
+            port (int): The port to run the app on. Defaults to 8080.
+            localhost (bool): Whether to run the app without exposing it on all
+                interfaces. Defaults to False.
+        """
+        super().run(host="localhost" if localhost else "0.0.0.0", port=port)
diff --git a/src/replit/maqpi/files.py b/src/replit/maqpi/files.py
new file mode 100644
index 0000000..b4a55ea
--- /dev/null
+++ b/src/replit/maqpi/files.py
@@ -0,0 +1,65 @@
+"""Utitilities for interacting with static files."""
+import flask
+
+
+class FileCache:
+    """A simple cache for files."""
+
+    def __init__(self) -> None:
+        self.data = {}
+
+    def add_to_cache(self, filename: str, content: str) -> None:
+        """Add a filename to the cache.
+
+        Args:
+            filename (str): The filename to add.
+            content (str): The content to add to the cache.
+        """
+        self.data[filename] = content
+
+    def has(self, filename: str) -> bool:
+        """Whether the cache has a certain filename.
+
+        Args:
+            filename (str): The filename to check for.
+
+        Returns:
+            bool: Whether the cache has filename.
+        """
+        return filename in self.data
+
+    def invalidate(self, filename: str) -> None:
+        """Remove a filename from the cache.
+
+        Args:
+            filename (str): The filename to remove.
+        """
+        try:
+            self.data.pop(filename)
+        except KeyError:
+            pass
+
+    def flush(self) -> None:
+        """Remove all values from the cache."""
+        self.data = {}
+
+
+cache = FileCache()
+
+
+class File(flask.Response):
+    """Represents a static file."""
+
+    def __init__(self, filename: str, no_cache: bool = False) -> None:
+        self.filename = str(filename)
+        self.no_cache = no_cache
+
+        # load file
+        if filename not in cache:
+            with open(filename, "r") as f:
+                self.content = f.read()
+
+            if not no_cache:
+                cache.add_to_cache(filename, self.content)
+
+        super().__init__(self.content)
diff --git a/src/replit/maqpi/html.py b/src/replit/maqpi/html.py
new file mode 100644
index 0000000..f2ea5b6
--- /dev/null
+++ b/src/replit/maqpi/html.py
@@ -0,0 +1,43 @@
+"""Class-representations for HTML elements."""
+from abc import ABC
+from dataclasses import dataclass
+
+import flask
+
+
+class HTMLElement(ABC):
+    """Base class for an HTML element."""
+
+    pass
+
+
+@dataclass
+class Paragraph:
+    """Represents a Paragraph (p) tag."""
+
+    content: str
+
+    def __str__(self) -> str:
+        return f"<p>{self.content}</p>"
+
+
+class Page(flask.Response):
+    """Represents an HTML page."""
+
+    def __init__(self, title: str = None, head: str = "", body: str = "") -> None:
+        self.title = title
+        self.head = head
+        self.body = body
+
+        title_html = f"<title>{self.title}</title>\n    " if self.title else ""
+        super().__init__(
+            f"""<!DOCTYPE html>
+<html>
+<head>
+    {title_html}{self.head}
+</head>
+<body>
+    {self.body}
+</body>
+</html>"""
+        )
diff --git a/src/replit/maqpi/utils.py b/src/replit/maqpi/utils.py
new file mode 100644
index 0000000..7935a39
--- /dev/null
+++ b/src/replit/maqpi/utils.py
@@ -0,0 +1,20 @@
+"""Utitilities to make development easier."""
+from .html import Page
+
+
+sign_in_snippet = (
+    '<script authed="location.reload()" '
+    'src="https://auth.turbio.repl.co/script.js"></script>'
+)
+
+
+def signin(title: str = "Please Sign In") -> Page:
+    """Return a sign-in page.
+
+    Args:
+        title (str): The title of the sign in page. Defaults to "Please Sign In".
+
+    Returns:
+        Page: The sign-in page.
+    """
+    return Page(title=title, body=sign_in_snippet)