Your App Development Partner

Underbelly is an award-winning app development company in the heart of Silicon Slopes. We design & build digital products used by millions of people each day.

No items found.

Trusted by top brands

Square LogoNetflix LogoFacebook logoNetflix Logoxbox logothe Bible Project Logo
We can help

Skip the costly set-up of an in-house team and get straight to the talent.

Success stories

No items found.

Ideas we've brought to life

Work samples

Helping Square design tools for sellers to manage risk and stay on top of their business.

Square Product Design

Crafting a user experience dedicated to helping couples feel connected.


Helping Facebook create a narrative around insights by building tools to help users better understand their data.

Facebook Creator Studio

Bring your vision to life

  • 1
    Tell us your idea
    and we'll develop a custom approach that works for you.
  • 2
    Meet your team
    and collaborate throughout the creative process.
  • 3
    Delight your customers
    with an exceptional product and experience.

Let's talk

about your big idea.

Thank you! Your submission has been received!
Oops! Something went wrong while submitting the form.


The Webby Awards
The Webby Awards are awards for excellence on the Internet presented annually by the International Academy of Digital Arts and Sciences.
Inc 5000
The Inc. 5000 lists the 5,000 fastest-growing private companies in the US.
5-Star Rating on
Clutch is a data-driven field guide for B2B buying and hiring decisions.

Not quite convinced?

Get in touch with us at
Common Questions
No items found.