Open-source Moqups alternatives

Penpot is an open-source design platform for teams building digital products. It runs in the browser or on your own servers, and its emphasis is ownership of the design infrastructure, which appeals to organizations with strict compliance or governance needs. It is often considered an open alternative to proprietary design tools such as Figma.

The platform uses open standards including SVG, CSS, HTML and JSON, so design files are closer to the code that implements them. Real-time collaboration lets designers and developers work together, and CSS Grid and Flex Layout let teams build responsive interfaces that behave like real layouts. Native design tokens act as a shared source of truth between design and development, which helps with larger design systems.

Penpot also exposes an open API and plugin system for automation and integrations, plus an MCP server for connecting AI workflows with design and code. It is written in Clojure and ClojureScript under the MPL-2.0 license, and a hosted version is available at penpot.app for teams that do not want to self-host.

tldraw is an SDK for building infinite canvas applications in React. It supplies a complete canvas engine that serves as the foundation for whiteboards, diagramming tools, design editors and other canvas products, and it ships a default whiteboarding tool set that you can use as is or replace with your own primitives.

Out of the box it offers pressure-sensitive drawing, geometric shapes, rich text, arrows with snapping, image and video support and image export. Developers can extend it with their own shapes, tools, bindings, interface components, side effects and event hooks, and can drive the canvas at runtime through the Editor API. Multiplayer collaboration is available through a self-hostable sync package, there are canvas primitives for building with LLMs, and the DOM-based rendering can embed websites such as YouTube, Figma and GitHub. It works in desktop and touch browsers.

Starter kits provide the custom shapes, tools and interface for common application types, and each kit is MIT licensed. The SDK itself is under tldraw's own license rather than a standard open-source one, so review the terms before shipping it in a commercial product.