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
Better UI Testing, Built by Developers Who Care
Founded in 2017 by Henric Persson and Joe Lencioni, Happo is a self-bootstrapped company dedicated to making front-end testing faster, more reliable, and easier to adopt. As experienced engineers who have built user interfaces for major technology companies like Airbnb, we understand the real-world challenges teams face — and we built Happo to solve them.
With more than 50 combined years of UI development experience and a strong background in open-source tooling, Henric and Joe bring a deep, hands-on commitment to every part of Happo. That means when you reach out for help, you're talking directly to the people who built the product — not a faceless support team.
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, or Cypress, 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.
Our Mission
At Happo, we believe that great user interfaces deserve great testing tools. Our mission is to empower front-end teams to ship with confidence, maintain visual quality, and move faster — without sacrificing reliability.
Meet the Team
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.
Pauline Mialhe, COO
Pauline excels at finding solutions to complex problems. She is able to see the big picture and understand the needs of customers as well as the team. With experience in the vibrant startup scene of Paris, she brings international expertise and a fresh approach to our operations.
Mai-Li Hammargren, Advisor
Mai-Li has a great track record of scaling startups. She spearheaded sales at Lookback and founded Mutewatch. As a senior advisor, she brings a wealth of experience running successful tech companies 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 today to learn more or get started.
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