The gap between design and development has been one of the most persistent friction points in software creation. Designers produce mockups in Figma, developers rebuild them in code, and the back-and-forth translation introduces delays, inconsistencies, and frustration. The three tools in this comparison represent a new generation of visual development environments where the visual representation and the code are the same artifact. Each takes a different approach to achieving this unity, from editing existing codebases visually to generating new applications from descriptions.
Onlook is an open-source visual editor with over 22,000 GitHub stars that connects directly to existing React, Next.js, and Vue projects. Unlike tools that generate code from scratch, Onlook works with your real components, styles, and project structure. Designers drag and drop real React components on an infinite canvas, make visual changes to layouts and styles, and submit pull requests for engineers to review. Changes sync to code in real time, meaning what you design IS the code. Onlook supports Tailwind CSS, CSS modules, styled-components, and works with any component library.
Lovable is a conversational AI application builder that generates complete full-stack web applications from natural language descriptions. Users describe what they want through a chat interface, and Lovable produces a working application with React frontend, Supabase backend, database schema, authentication, and deployment, all in a single session. The platform handles the entire lifecycle from generation through iterative refinement to production deployment, making it possible for non-technical founders to create functional web products without writing a line of code.
Tempo Labs, a Y Combinator S23 company, has evolved from a visual React editor into a full prompt-to-app platform with a unique multi-agent planning approach. When given a description, Tempo deploys multiple AI agents that collaborate on architecture, user flows, and screen breakdowns before writing any code. The resulting plan is visible as flow diagrams that users can review and adjust. Once generation begins, Tempo provides a visual editor for tweaking components with drag-and-drop, with changes modifying the actual React code underneath. It is specifically optimized for Vite and Tailwind CSS.
The fundamental architectural difference lies in whether these tools edit existing code or generate new code. Onlook is designed to work with your existing codebase, connecting to projects already in development and providing visual editing on top of real components. Lovable and Tempo both generate new projects from scratch, creating applications from descriptions rather than modifying existing ones. This distinction determines when each tool is most valuable: Onlook for ongoing development and refinement, Lovable and Tempo for initial creation and prototyping.