diff --git a/dev.py b/dev.py
new file mode 100644
index 0000000..9c84965
--- /dev/null
+++ b/dev.py
@@ -0,0 +1,8 @@
+"""Expose a development application."""
+
+from xppl.app import create_app
+from xppl.socketio import socketio
+
+app = create_app('xppl.config.Development')
+
+socketio.run(app)
diff --git a/run.py b/run.py
deleted file mode 100755
index 73c639f..0000000
--- a/run.py
+++ /dev/null
@@ -1,3 +0,0 @@
-from xppl import app, socketio
-
-socketio.run(app, host='0.0.0.0', port=8080)
diff --git a/wsgi.py b/wsgi.py
new file mode 100644
index 0000000..4197b2c
--- /dev/null
+++ b/wsgi.py
@@ -0,0 +1,5 @@
+"""Expose a production application."""
+
+from xppl.app import create_app
+
+app = create_app('xppl.config.Production')
diff --git a/xppl/__init__.py b/xppl/__init__.py
index c69d88b..e69de29 100755
--- a/xppl/__init__.py
+++ b/xppl/__init__.py
@@ -1,37 +0,0 @@
-import os
-from os import environ
-
-from dotenv import find_dotenv, load_dotenv
-from flask import Flask
-from flask_socketio import SocketIO
-from flask_sqlalchemy import SQLAlchemy
-from sqlalchemy.dialects import registry
-
-registry.register(
-    'rqlite.pyrqlite',
-    'sqlalchemy_rqlite.pyrqlite',
-    'dialect'
-)
-
-BASEDIR = os.path.abspath(os.path.dirname(__file__))
-UPLOAD_FOLDER = os.path.join(BASEDIR, 'uploads')
-UPLOAD_FOLDER_COVER = os.path.join(BASEDIR, 'cover')
-
-load_dotenv(find_dotenv())
-
-app = Flask(__name__)
-
-app.config['SECRET_KEY'] = 'super secret key'
-app.config['UPLOAD_FOLDER'] = UPLOAD_FOLDER
-app.config['SQLALCHEMY_DATABASE_URI'] = 'rqlite+pyrqlite://localhost:4001/'
-app.config['DEBUG'] = True
-app.config['PORT'] = 80
-
-db = SQLAlchemy(app)
-light = not os.path.isdir(UPLOAD_FOLDER)
-DOMAIN = environ.get('DOMAIN')
-socketio = SocketIO(app)
-
-app.config.from_object(__name__)
-
-from xppl import views  # noqa
diff --git a/xppl/app.py b/xppl/app.py
new file mode 100644
index 0000000..23b7cf8
--- /dev/null
+++ b/xppl/app.py
@@ -0,0 +1,57 @@
+"""Main application factory."""
+
+from dotenv import find_dotenv, load_dotenv
+from flask import Flask
+from sqlalchemy.dialects import registry
+
+
+def create_app(config):
+    app = Flask(__name__.split('.')[0])
+
+    app.config.from_object(config)
+
+    configure_dotenv()
+    configure_pyrqlite()
+    configure_socketio(app)
+    configure_sqlalchemy(app)
+
+    with app.app_context():
+        from xppl import views  # noqa
+
+    return app
+
+
+def configure_pyrqlite():
+    """Configure PyRQLite."""
+    registry.register(
+        'rqlite.pyrqlite',
+        'sqlalchemy_rqlite.pyrqlite',
+        'dialect'
+    )
+
+
+def configure_dotenv():
+    """Configure the environment."""
+    load_dotenv(find_dotenv())
+
+
+def configure_sqlalchemy(app):
+    """Configure SQLAlchemy."""
+    from xppl.database import db
+    from xppl.models import (  # noqa
+        Book, Author, Instance,
+        Potential, UserIns, Chat,
+        Stack,
+    )
+
+    db.init_app(app)
+
+    with app.app_context():
+        db.create_all()
+
+
+def configure_socketio(app):
+    """Configure SocketIO."""
+    from xppl.socketio import socketio
+
+    socketio.init_app(app)
diff --git a/xppl/config.py b/xppl/config.py
new file mode 100644
index 0000000..85324cb
--- /dev/null
+++ b/xppl/config.py
@@ -0,0 +1,32 @@
+"""The Application settings."""
+
+from os.path import abspath, dirname, isdir, join
+
+
+class Base():
+    """The base configuration."""
+    BASEDIR = abspath(dirname(__file__))
+
+    UPLOAD_FOLDER_COVER = join(BASEDIR, 'cover')
+    UPLOAD_FOLDER = join(BASEDIR, 'uploads')
+    LIGHT = isdir(UPLOAD_FOLDER)
+
+    DEBUG = False
+    TESTING = False
+
+    SQLALCHEMY_TRACK_MODIFICATIONS = False
+    SQLALCHEMY_DATABASE_URI = 'rqlite+pyrqlite://localhost:4001/'
+
+
+class Production(Base):
+    """The production configuration."""
+    ENV = 'production'
+    DOMAIN = 'https://book.vvvvvvaria.org'
+
+
+class Development(Base):
+    """The development configuration."""
+    ENV = 'development'
+    DEBUG = True
+    TESTING = True
+    DOMAIN = 'http://localhost'
diff --git a/xppl/database.py b/xppl/database.py
new file mode 100644
index 0000000..787a01c
--- /dev/null
+++ b/xppl/database.py
@@ -0,0 +1,5 @@
+"""Database initialisation."""
+
+from flask_sqlalchemy import SQLAlchemy
+
+db = SQLAlchemy()
diff --git a/xppl/forms.py b/xppl/forms.py
index 4feeb3b..dd6c979 100755
--- a/xppl/forms.py
+++ b/xppl/forms.py
@@ -1,4 +1,3 @@
-from xppl.models import Author
 from flask_wtf import FlaskForm
 from wtforms import FieldList, FileField
 from wtforms import Form as NoCsrfForm
@@ -6,6 +5,7 @@ from wtforms import validators
 from wtforms.fields import FormField, SelectField, StringField, SubmitField
 from wtforms.fields.html5 import DecimalRangeField
 from wtforms.validators import DataRequired, InputRequired
+from xppl.models import Author
 
 
 # - - - Forms - - -
diff --git a/xppl/models.py b/xppl/models.py
index 1d8f5b0..97feb3b 100755
--- a/xppl/models.py
+++ b/xppl/models.py
@@ -1,8 +1,8 @@
 import datetime
 
-from xppl import db
 from marshmallow import Schema, ValidationError, fields
 from sqlalchemy import Column, DateTime
+from xppl.database import db
 
 
 authors = db.Table(
diff --git a/xppl/socketio.py b/xppl/socketio.py
new file mode 100644
index 0000000..8d9acee
--- /dev/null
+++ b/xppl/socketio.py
@@ -0,0 +1,5 @@
+"""SocketIO initialisation."""
+
+from flask_socketio import SocketIO
+
+socketio = SocketIO()
diff --git a/xppl/views.py b/xppl/views.py
index c805e22..342cf56 100755
--- a/xppl/views.py
+++ b/xppl/views.py
@@ -8,7 +8,8 @@ from functools import wraps
 from urllib.parse import quote as urlquote
 
 import autocomplete
-from xppl import DOMAIN, app, db, light, socketio
+from xppl.database import db
+from xppl.socketio import socketio
 from xppl.cover import get_cover
 from xppl.extractText import extract_text
 from xppl.forms import (
@@ -24,7 +25,7 @@ from xppl.models import (
 from flask import (
     Response, abort, flash, jsonify, redirect,
     render_template, request, send_from_directory,
-    url_for
+    url_for, current_app as app
 )
 from flask_socketio import emit
 from flask_weasyprint import HTML, render_pdf
@@ -32,7 +33,6 @@ from sqlalchemy.inspection import inspect
 from sqlalchemy.sql.expression import func
 from werkzeug.utils import secure_filename
 
-# import sqlite3
 ALLOWED_EXTENSIONS = set(['txt', 'pdf', 'epub', 'chm', 'mobi'])
 
 author_schema = AuthorSchema()
@@ -46,8 +46,9 @@ chats_schema = ChatSchema(many=True)
 
 
 def allowed_file(filename):
-    return '.' in filename and \
-           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS
+    extension = filename.rsplit('.', 1)[1].lower()
+    return '.' in filename and extension in ALLOWED_EXTENSIONS
+
 ###
 # Routing for your application.
 ###
@@ -56,7 +57,7 @@ def allowed_file(filename):
 def check_light(func):
     @wraps(func)
     def decorated_function(*args, **kwargs):
-        if not light:
+        if not app.config['LIGHT']:
             return func(*args, **kwargs)
         else:
             flash("Your account has expired. Update your billing info.")
@@ -67,8 +68,6 @@ def check_light(func):
 
 @app.route('/', methods=['POST', 'GET'])
 def home():
-    print("/////////////")
-    print(light)
     chat_messages = db.session.query(Chat).all()
     username = 'librarian'
     server = request.host
@@ -79,13 +78,13 @@ def home():
 
     return render_template(
         'home.html',
-        domain=DOMAIN,
+        domain=app.config['DOMAIN'],
         chat=chat_messages,
         channel=1,
         username=username,
         client=client,
         server=server,
-        light=light
+        light=app.config['LIGHT'],
     )
 
 
@@ -97,7 +96,7 @@ def hello(name):
 @app.route('/about/')
 def about():
     """Render the website's about page."""
-    return render_template('about.html', light=light)
+    return render_template('about.html', light=app.config['LIGHT'])
 
 
 @app.route('/uploads/<filename>')
@@ -124,7 +123,7 @@ def annotations():
         'annotations.html',
         annot=annot,
         books=books,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -133,7 +132,11 @@ def annotations():
 def annotations_pdf():
     annot = get_annotations()
     # Make a PDF straight from HTML in a string.
-    html = render_template(('annotations.html'), annot=annot, light=light)
+    html = render_template(
+        'annotations.html',
+        annot=annot,
+        light=app.config['LIGHT'],
+    )
     return render_pdf(HTML(string=html))
 
 
@@ -179,7 +182,6 @@ def scape():
     if request.method == 'POST':
         data = request.form
         book = Book.query.get(data['id'])
-        print(book.scapeX)
         book.scapeX = data['x']
         book.scapeY = data['y']
         db.session.commit()
@@ -207,7 +209,11 @@ def scape_new():
 @app.route('/books_grid')
 def show_books_grid():
     books = db.session.query(Book).all()
-    return render_template('show_books_grid.html', books=books, light=light)
+    return render_template(
+        'show_books_grid.html',
+        books=books,
+        light=app.config['LIGHT']
+    )
 
 
 @app.route('/books/<int:id>')
@@ -236,7 +242,11 @@ def show_book_by_id(id):
         db.session.add(user_info)
         db.session.commit()
     if not book:
-        return render_template('red_link.html', id=id, light=light)
+        return render_template(
+            'red_link.html',
+            id=id,
+            light=app.config['LIGHT']
+        )
     else:
         return render_template(
             'show_book_detail.html',
@@ -247,7 +257,7 @@ def show_book_by_id(id):
             name=name,
             annot=annot,
             res=res,
-            light=light
+            light=app.config['LIGHT']
         )
 
 
@@ -359,7 +369,7 @@ def edit_book_by_id(id):
         'edit_book_detail.html',
         book=book_to_edit,
         form=user_form,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -505,7 +515,7 @@ def add_book():
         books_potential=books_potential,
         earliest=earliest,
         latest=latest,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -530,7 +540,7 @@ def show_author_by_id(id):
         return render_template(
             'show_author_detail.html',
             author=author,
-            light=light
+            light=app.config['LIGHT']
         )
 
 
@@ -545,7 +555,11 @@ def edit_author_by_id(id):
 @app.route('/stacks')
 def show_stacks():
     stacks = db.session.query(Stack).all()
-    return render_template('show_stacks.html', stacks=stacks, light=light)
+    return render_template(
+        'show_stacks.html',
+        stacks=stacks,
+        light=app.config['LIGHT']
+    )
 
 
 @app.route('/stacks/add_stack', methods=['POST', 'GET'])
@@ -569,7 +583,7 @@ def add_stack():
         'add_stack.html',
         stacks=stacks,
         form=form,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -589,13 +603,13 @@ def show_stack_by_id(id, is_tab=False):
         return render_template(
             'show_stack_detail.html',
             stack=stack,
-            light=light
+            light=app.config['LIGHT']
         )
     else:
         return render_template(
             'show_stack_detail_tab.html',
             stack=stack,
-            light=light
+            light=app.config['LIGHT']
         )
 
 
@@ -629,7 +643,7 @@ def edit_stack_by_id(id):
         'edit_stack_detail.html',
         stack=stack,
         form=form,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -672,7 +686,7 @@ def show_instances():
     return render_template(
         'show_instances.html',
         instances=instances,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -685,10 +699,18 @@ def remove_from_stack(bookid, stackid):
     book = Book.query.get(bookid)
     stack = Stack.query.get(stackid)
     if book not in stack.books:
-        return render_template('show_book_detail.html', book=book, light=light)
+        return render_template(
+            'show_book_detail.html',
+            book=book,
+            light=app.config['LIGHT']
+        )
     stack.books.remove(book)
     db.session.commit()
-    return render_template('show_book_detail.html', book=book, light=light)
+    return render_template(
+        'show_book_detail.html',
+        book=book,
+        light=app.config['LIGHT']
+    )
 
 # Search
 
@@ -710,7 +732,7 @@ def show_books():
             'show_books_grid.html',
             books=books,
             form=search,
-            light=light
+            light=app.config['LIGHT']
         )
 
     if search.listview.data:
@@ -720,7 +742,7 @@ def show_books():
             'show_books.html',
             books=books,
             form=search,
-            light=light
+            light=app.config['LIGHT']
         )
 
     if request.method == 'POST':
@@ -750,7 +772,7 @@ def show_books():
         'show_books.html',
         books=books,
         form=search,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -823,7 +845,7 @@ def search_results(searchtype, query, viewby):
             form=upload_form,
             title=query,
             books=books,
-            light=light
+            light=app.config['LIGHT']
         )
 
     count = results.count()
@@ -844,7 +866,7 @@ def search_results(searchtype, query, viewby):
             count=count,
             whole=whole,
             percentage=percentage,
-            light=light
+            light=app.config['LIGHT']
         )
 
     if search.grid.data:
@@ -859,7 +881,7 @@ def search_results(searchtype, query, viewby):
             count=count,
             whole=whole,
             percentage=percentage,
-            light=light
+            light=app.config['LIGHT']
         )
 
     if request.method == 'POST':
@@ -907,7 +929,7 @@ def search_results(searchtype, query, viewby):
             count=count,
             whole=whole,
             percentage=percentage,
-            light=light
+            light=app.config['LIGHT']
         )
 
     else:
@@ -921,7 +943,7 @@ def search_results(searchtype, query, viewby):
             count=count,
             whole=whole,
             percentage=percentage,
-            light=light
+            light=app.config['LIGHT']
         )
 
 
@@ -981,7 +1003,7 @@ def add_to_stack(id):
             stacks=stacks,
             book=book,
             add_form=add_form,
-            light=light
+            light=app.config['LIGHT']
         )
     else:
         stack = Stack.query.get(int(add_form.select_stack.data))
@@ -991,7 +1013,7 @@ def add_to_stack(id):
         return render_template(
             'show_stack_detail.html',
             stack=stack,
-            light=light
+            light=app.config['LIGHT']
         )
 
 
@@ -1023,7 +1045,6 @@ def export_csv():
     for book in Book.query.order_by("title"):
         row = {}
         for col in fieldnames:
-            print(getattr(book, col))
             row[col] = getattr(book, col)
         for col in referred_classes:
             subattr = []
@@ -1128,7 +1149,7 @@ def import_csv():
     return render_template(
         'import_csv.html',
         numberadded=numberadded,
-        light=light
+        light=app.config['LIGHT']
     )
 
 
@@ -1140,7 +1161,6 @@ def empty_catalogue():
         if (str(table) == "books"
            or str(table) == "authors"
            or str(table) == "books_authors"):
-            print('Clear table %s' % table)
             db.session.execute(table.delete())
     db.create_all()
     db.session.commit()
@@ -1193,7 +1213,7 @@ def add_header(response):
 @app.errorhandler(404)
 def page_not_found(error):
     """Custom 404 page."""
-    return render_template('404.html', light=light), 404
+    return render_template('404.html', light=app.config['LIGHT']), 404
 
 
 # SOCKET for the chat