--- a
+++ b/src/dash/index.py
@@ -0,0 +1,40 @@
+import dash_core_components as dcc
+import dash_html_components as html
+from dash.dependencies import Input, Output
+
+from app import app
+from apps import pca, differential_expression, linear_regression, clustergrammer
+
+app.layout = html.Div([
+    dcc.Location(id='url', refresh=False),
+    html.Div(id='page-content')
+])
+
+server = app.server
+
+@app.callback(Output('page-content', 'children'),
+              [Input('url', 'pathname')])
+def display_page(pathname):
+
+    if pathname == '/':
+        return pca.layout
+
+    elif pathname == '/pca':
+        return pca.layout
+
+    elif pathname == '/differential_expression':
+        return differential_expression.layout
+
+    elif pathname == '/linear_regression':
+        return linear_regression.layout
+    
+    elif pathname == '/clustergrammer':
+        return clustergrammer.layout
+
+    else:
+        return '404'
+
+if __name__ == '__main__':
+    app.run_server(
+        debug=True,
+        host='0.0.0.0')