Addstract UI Kit (White & Dark Theme, Sketch) graphicpear.com

Two high-quality webpage themes combined in one UI pack with fully customizable symbols for startups and small businesses. Built for Sketch app, contains plenty of valuable components.

Addstract UI is designed by Daniel Mitev, to be in help of everyone who is starting his own business and don't have plenty of resources to spend on hiring a good web designer. It's Free!