Phil Glass
Monzo
Happo allows us to make changes to components used on hundreds of screens and upgrade core UI dependencies with confidence. It has been a big productivity boost over our previous workflow.
About Happo
We've spent careers shipping UI at places like Airbnb, and we know how fragile even the best teams' interfaces can get. Happo is the self-bootstrapped visual and accessibility regression testing platform we started building in 2014 to fix that. We still build it, support it, and answer every email ourselves.
Why teams choose Happo
- Founder-led support
Need help? You'll be talking directly with Henric or Joe — not a ticket system.
- Self-bootstrapped
No venture capital, no outside pressures. Just a pure focus on making the best visual testing platform for you.
- Built for modern teams
Whether you use Storybook, Playwright, Cypress, or native apps via our API, Happo integrates seamlessly into your workflow.
- Comprehensive browser coverage
Test across Chrome, Firefox, Safari, Edge, and even iOS Safari — no extra setup required.
- Global perspective
With offices in Stockholm, Sweden, and Minneapolis, Minnesota, we bring a thoughtful, quality-driven approach rooted in craftsmanship.
Boris Yordanov
Toptal
Happo to the rescue! It's a direct competitor to Percy, but it's much cheaper, supports more browsers, and is easier to use. Another big selling point? It supports Cypress integration.
Arne Zeising
re:cap
Our Playwright E2E tests passed successfully, as the app's functionality remained intact. However, Happo detected the unwanted changes in the text's color and positioning, which would have been noticeable and disruptive to users.
Happo's mission
We want shipping code to be fun. Our mission is to keep that joy alive at scale, so teams can move fast without breaking the interfaces they care about.
Meet the founders
Henric Persson
Founder and CEO
A seasoned UI engineer and open-source contributor, Henric has spent decades pushing the boundaries of front-end quality assurance. His passion for visual integrity in user interfaces led directly to the founding of Happo.
Joe Lencioni
Founder and CTO
With deep expertise in software architecture and user experience, Joe brings technical leadership and a relentless focus on performance and developer experience to Happo. He's passionate about creating tools that feel invisible — because they just work.
Our story
- 2014
Joe and Henric build the first version of DiffUX, the project that would later become Happo.
- 2015
The open-source project is launched.
- 2017
The commercial product Happo launches under the Swedish entity Recur AB.
- 2024
Happo LLC is founded and the Minnesota office opens.
- 2025
Accessibility testing is added to Happo.
Let's build better UIs together
If you're ready to modernize your front-end testing, we're ready to help. Contact us to learn more or get started.
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