Understrap =
Underscores + Bootstrap

The Free WordPress Theme Framework For Handcrafted Sites

A person is working on a laptop with white earphones. Focus is on their hands typing. The environment appears to be a light workspace.

Trusted by more than 100,000 sites…

This image displays the official shield logo of Harvard University, featuring a crimson background, a crest with Latin text "VERITAS," and three open books.
The image features the logo of Facebook: the word "facebook" in lowercase letters with a blue gradient against a transparent background.
The image features the logo of Intel, with its name in a stylized blue font enclosed within an oval, all set against a green background.
The image displays the Tokyo 2020 Olympic Games logo, featuring a checkered circle emblem and the iconic interlocking Olympic rings beneath.
The image shows the gold-colored text "THE OSCARS®" above a small silhouette of the iconic Oscar statuette, indicating the branding for the prestigious film awards.
This image shows the logo of NGINX, displayed in bold green letters on a plain background, representing the software for web serving, reverse proxying, caching, load balancing, and media streaming.

Built for Custom WordPress Developers

Understrap is an open-source project maintained and powered by HDC, a web development firm with more than 20 years experience innovating online.

Underscores on the Back-End

Start with simple, powerful theme code based on Underscores, the best-practices starter theme from Automattic, the creators of WordPress.

Bootstrap on the Front-End

Add beautiful, flexible styles, components, grids and responsive design with Bootstrap, the industry standard for mobile-first development.

Our developers speak for themselves…

A person is focused on a laptop inside a vehicle, presumably a train. They are wearing headphones, sitting by the window with a thoughtful demeanor.

‘A great starting point for just about any design’

“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.”

– David Robinson

A smiling person with short hair, wearing a white and burgundy hoodie, posing indoors. There's a blurred background suggesting an office environment.

‘Changed the web game for me’

“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!”

– Zak Dietzen

A person smiles at the camera with a beach background, clear skies, and palm trees. They have short hair and are wearing a gray t-shirt.

‘The perfect theme for me as a developer’

“Understrap has been the perfect theme for me as a developer, and an absolute pleasure to use for the past 4 years.

It is clean, fast, lightweight, and super easy to customize using Understrap’s child theme.

Thank you Understrap!”

– Alexander Burton

A close-up of a laptop keyboard illuminated with vibrant pink and blue lights, creating a colorful gradient across the sleek, modern surface.

Launch Faster with Instant Understrap

  • Instant, lifetime access to the official course
  • 5+ hours of in-depth video lessons
  • Written companion cheat-sheets, code samples and transcripts

Get started by downloading the free framework today.