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Builder.io

Category: AI Agents

Builder.io is a visual development platform that enables teams to build web and mobile experiences faster using AI-powered tools for product, design, and code. Builder.io was founded in 2018. The company is led by Steve Sewell. Based in San Francisco, United States. Team size: 144. Total funding raised: $37.2 million. Latest round: Series B. Key investors include Greylock, Imaginary Ventures, Microsoft's M12 Fund, LinkedIn, Bessemer Venture Partners.

Founded
2018
Headquarters
San Francisco, United States
Team size
144
Total funding
$37.2 million

Value proposition

AI-driven visual development platform that unifies product, design, and code, enabling non-technical users to create dynamic content while integrating with any backend or API

Products and solutions

Visual Development Platform (drag-and-drop editor + headless CMS), Fusion AI Agent (product-design-code automation), Mitosis (open-source project for component libraries), No-code/low-code integrations for Slack, Jira, Figma, and repos

Unique value

First AI agent (Fusion) that connects product, design, and code workflows, enabling bidirectional sync with tools like Figma and automated PR generation

Target customer

Businesses requiring rapid web/mobile development, including marketers, developers, and product teams; industries like e-commerce, SaaS, and enterprise applications

Industries served

E-commerce, SaaS, Enterprise Web Applications, Technology, Retail

Technology advantage

AI-powered design-to-code conversion, headless CMS flexibility, and real-time collaboration tools for developers and non-developers

How they differentiate

Builder.io differentiates through AI-powered visual development (Fusion 1.0), Mitosis open-source framework integration, and headless CMS capabilities tailored for developer workflows

Main competitors

Webflow, Contentful, Sanity, Strapi, Plasmic

Key partnerships

Microsoft (M12 venture fund investment), Integration partnerships with Figma, Slack, Jira, and major development ecosystems

Notable customers

Nike, Slack, Dropbox, Zapier, Everlane, Scale AI, JCREW, Harry's, Experian, Faire, Vistaprint, Aloyoga, ClickUp, Cathay Bank, Panasonic, Pendo, Schneider Electric, Quantcast, Afterpay, Fabletics, Vimeo

Major milestones

2021 - Launched headless CMS platform, 2022 - Reached 100+ enterprise clients, 2023 - Open-sourced Mitosis framework, 2024 - Released AI Agent Fusion 1.0, 2024 - Secured $20M in Series B funding led by M12

Growth metrics

70% YoY revenue growth, $19.4M ARR (2024)

Market positioning

Positioned as an AI-enhanced platform for enterprise-grade visual development, targeting both developers and non-technical users with drag-and-drop interfaces and code-level customization

Geographic focus

Primarily U.S.-centric with expansion into global markets, serving clients in North America, Europe, and APAC through digital delivery

Patents and IP

No public patents listed; relies on proprietary AI workflows and platform architecture

About Steve Sewell

Co-founder and CEO of Builder.io since 2018. Previously worked as Lead Web Engineer at ShopStyle, co-founded PICT (acquired by POPSUGAR), and served as Head of Product Development at Qanvis. Creator of the Mitosis open source project. Studied at University of California, Berkeley.

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