Understrap: Bootstrap + Underscores Framework

The Bootstrap 4 + WordPress Theme Framework


Understrap combines the Underscores starter theme (by Automattic) and the mobile-first, responsive grid framework Bootstrap 4 (by Twitter) into a perfect open source foundation for your next WordPress theme project.

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100k+ Understrap Sites 10 Themes WooCommerce Ready

Rated 4.9 / 5 stars on GumRoad by 323 Developers.

Powering over 100k+ WordPress websites.

Works great with:

WooCommerce Logo NPM Logo SASS Logo


We use Understrap for most of our WordPress projects. We find it is a great starting point for just about any design.

It takes a lot of the initial setup of a theme out of the equation allowing us to start building sooner.

It is easy to customise to the needs of our clients as well as build our own custom sections that work well with the theme as it includes Bootstrap 4.

Air 66 Design Logo David Robinson Photo

David Robinson

Air 66 Design

Understrap has changed the web game for me! I use understrap for nearly EVERY site I build. It has become a key part of my theme building process.

It is the perfect theme to build beautiful responsive sites. I highly recommend this to anyone and everyone!

Stop reading my review and get strapped!

Imagine This! Logo Zak Dietzen Photo

Zak Dietzen

Imagine This! Marketing Group

Our developer uses Understrap when we want to quickly test a new product idea or event type.

Since switching to Understrap, we save both time and money with these launches.

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Jason Lawrence

How To Make A Server

We've been using Understrap for years. It easily saves us 10 hours of work on custom web builds.

The best part is fast-loading pages with zero bloat which is perfect for SEO.

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Clayton Johnson

The Guerrilla Agency

About Understrap

Underscores starter theme

Based on the "best-practices" starter theme Underscores, or just "_s" - Made by Automattic, the company behind WordPress.

Bootstrap 4 Grid framework

Uses Bootstrap 3 Bootstrap 4 for markup and CSS styles - THE industry standard for responsive and mobile friendly websites.


Utilizes the SASS sources from all assets as well as own SASS files. Makes it easy to replace colors, fonts, stylings etc.


Comes with npm support to manage all the dependencies. Just one command in your terminal is needed to update all assets.


Comes with Gulp as task runner and one pre-made gulpfile.js with some default tasks. For example to compile SASS to CSS.


Get started by downloading the free framework today.

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