Open Source Penpot Alternatives

Excalidraw is a browser-based whiteboarding tool built around one idea: making diagrams feel human. Everything you draw comes out with a sketchy, hand-drawn style that keeps things informal and approachable, which makes it popular for brainstorming sessions, technical diagrams, and quick wireframes where polish would actually get in the way.

It's built for collaboration. Multiple people can work on the same canvas in real time, making it a practical choice for remote teams who need a shared visual space without spinning up heavy software.

Key capabilities include:

• Hand-drawn rendering that gives shapes, arrows, and text a natural, informal look
• Real-time multiplayer so teams can sketch together live
• Exportable scenes to PNG, SVG, or the native .excalidraw format for reuse
• Libraries of reusable shapes and components you can drop into any canvas
• End-to-end encrypted sharing when you share a link with collaborators
• Embeddable in other apps via its open API, which is why it shows up inside tools like Obsidian and Notion

Compared to tools like draw.io or tldraw, Excalidraw leans harder into the sketchy aesthetic as a deliberate design choice rather than a mode you toggle. It's not trying to produce publication-ready diagrams. That constraint is the point: it keeps conversations focused on ideas rather than pixel-perfect layouts.

The canvas is infinite, the interface stays minimal, and the whole thing runs in the browser with no account required to start drawing.

tldraw is a free virtual whiteboard that opens in your browser and works immediately. No account, no installation, no waiting. It runs on desktop, tablet, and mobile, making it practical for quick sketches, brainstorming sessions, or visual collaboration across teams.

The core experience is fast and low-friction. You get a clean infinite canvas with drawing tools, shapes, text, arrows, and sticky notes. Real-time multiplayer is built in, so multiple people can draw and edit together without any setup. Share a link and collaborators are in.

What sets tldraw apart from tools like Excalidraw or draw.io is its focus on feel. The drawing experience is deliberately smooth, with snapping, alignment guides, and a hand-drawn aesthetic that makes diagrams feel approachable rather than stiff. It's well-suited for informal collaboration: wireframes, quick diagrams, meeting notes with visuals, or just thinking out loud with a colleague.

Key capabilities include:

• Infinite canvas with zoom and pan that stays responsive at any scale
• Multiplayer collaboration via shareable links, no accounts required for guests
• Shape library covering arrows, connectors, text, and freehand drawing
• Embeds so you can drop in images and other content directly onto the board
• Export to PNG, SVG, and JSON for use outside the app

tldraw is also available as an open-source SDK, which means developers can embed the whiteboard engine directly into their own products. That dual nature (polished end-user tool and embeddable component) gives it a broader reach than most LucidChart alternatives in this space.

Graphite is a free, open source vector and procedural graphics editor that runs entirely in your browser without requiring an account or installation. It's aimed at designers who want a nondestructive workflow, where every creative decision stays editable through parameters rather than being baked in permanently.

Unlike most online design tools, Graphite is built around a node graph at its core. Instead of drawing shapes and committing to them, you build systems of nodes that generate and transform artwork procedurally. Want your scattered circles denser? Drag a slider. Want a different fill pattern? Swap a node. Nothing is destructive by default.

Key capabilities include:

• Procedural vector editing using a node-based layer system that lets you compose, reuse, and automate design workflows
• Nondestructive boolean operations for combining and modifying shapes without losing the originals
• Parametric iteration so you can morph between states, blend color schemes, or adjust placement areas with sliders rather than manual edits
• Infinite scalability with no pixelation, and export to SVG, PNG, or JPG at any resolution
• Fully local execution with no server involved, keeping your work private on your own hardware

Graphite is built with WebAssembly and WebGPU, which gives it performance closer to a native app than a typical browser tool. It's architecturally more like a game engine than a conventional creative app.

Desktop apps for Windows, Mac, and Linux are in late development, but the browser version is already functional and kept current. The project is in alpha, so some planned features like raster editing, live collaboration, and standalone program compilation from node graphs aren't available yet.

For designers tired of jumping between a vector editor, a compositing tool, and a generative design environment, Graphite is building toward a single app that handles all of it. It's a credible open source alternative to tools like Penpot for those who want procedural depth over a traditional layer-based approach.

Grida is an open source canvas editor aimed at designers and developers who want a single tool for visual design and web app building. It covers the range from polished UI/UX layouts to pixel art, with enough extensibility that developers can embed it, script it, or build entirely new tools on top of it.

The canvas itself is general-purpose. You can work from templates, drag in widgets and icons, write copy with an AI assistant, and edit text directly on the canvas. Figma import and export means you're not starting from scratch if your team already has assets in Figma. For pixel work, there's a dedicated free pixel drawing mode built into the same editor.

What separates Grida from tools like Penpot or Excalidraw is its developer-first architecture:

• React component – embed the canvas directly in your own app, or bring your own React components into it
• Modular SDK – build custom tools on top of Grida's core rather than being locked into the default interface
• Scripting interface – automate design tasks and write plugins using a runtime scripting layer
• Performance – compute-heavy modules run on Rust and WebGPU, which matters when you're working with complex documents or large canvases

For teams, Grida offers enterprise options with on-premise deployment and custom solutions, so it's not just a solo design tool.

It fits developers who want a visual web builder they can actually hack on, and designers who need something between a lightweight whiteboard and a full-featured UI tool.

Quant-UX is a powerful, free, open-source tool for UX designers and researchers. It offers a comprehensive suite of features to streamline the entire UX process:

• Rapid Prototyping: Create interactive prototypes quickly using a visual editor. Add animations, logic flows, and form validation to make your designs feel like real apps.
• User Testing: Conduct usability tests effortlessly by sharing a link with your audience. Define user tasks, record screen interactions, and even perform A/B testing to compare design alternatives.
• Analytics and Insights: Automatically generate heatmaps, success rates, and other key metrics from your user tests. Identify drop-off points and gather valuable user feedback through built-in surveys.
• Design System Support: Utilize design tokens, components, and master screens to build scalable design systems for your projects.
• AI-Assisted Design: Leverage an AI assistant to speed up repetitive tasks and get faster, more accurate results during the design process.
• Low-Code Capabilities: Convert your designs into production-ready systems, bridging the gap between prototyping and development.

Quant-UX is trusted by thousands of users worldwide, including researchers, students, and professionals. Its combination of prototyping, testing, and analytics in a single platform makes it an invaluable tool for creating data-driven, user-centered designs.

Whether you're working on a small project or a large-scale application, Quant-UX provides the tools you need to craft, evaluate, and evolve your user experiences effectively.