Proto.io Inc. is a privately held SaaS company, founded in 2011 by Alexis Piperides and Alexis Odysseos in San Francisco, now with an office in Nicosia, Cyprus. The company’s mission is to help product teams build better products by enabling seamless communication via design-driven prototyping tools.
Proto.io is bootstrapped, raising only a seed round in 2014. It remains VC-backed with no major subsequent funding. As of mid-2025, it operates with 15–34 employees, generating approximately $1.8 M to $3.9 M in annual revenue.
Starting as a solution for iPad prototyping, Proto.io expanded to support web, mobile, TV, and wearables. In 2024, they launched Overflow, a user-flow diagramming tool, highlighting growth into complementary UX products.
Proto.io offers:
While Proto.io itself hasn’t been acquired or acquired others, Overflow marks its evolution into UX-diagramming. Most news related to “io” refers to unrelated firms, like Jony Ive’s io acquisition by OpenAI.
Proto.io emphasizes collaboration, innovation, learning, flexibility (remote work, wellness, retreats), and customer feedback. Glassdoor reviews rate the Nicosia office around 3.7–4.0/5, noting a supportive environment, learning opportunities, and responsible leadership—but also mention lower salaries. Company responses indicate they value employee feedback and continuous improvement.
Proto.io is trusted by over 1 million users, including freelancers, startups, and Fortune 500 clients. The FeaturedCustomers page highlights specific testimonies about how Proto.io improves design workflows and stakeholder approval. Product Hunt (2024–2025) shows positive community shoutouts and adoption across global tech teams.
