Excalidraw is a free virtual whiteboard that gives every shape an informal, hand-drawn look. You sketch architecture, wireframes and flowcharts in the browser, share a link, and export PNG or SVG. The core app costs nothing; Excalidraw+ adds cloud storage and AI diagram generation from $6/month.
What is Excalidraw?
Excalidraw launched in 2020 as an open-source React canvas app. Two things made it stick: the rough.js rendering that makes boxes look sketched by hand, and end-to-end encryption on shared rooms so the server never sees your drawing. The code is MIT-licensed and self-hostable, and the same canvas ships inside Notion, Google Docs and VS Code extensions.
Does Excalidraw have AI?
Yes, but only on the paid Excalidraw+ plan. You type a prompt like “login flow with OAuth” and it drops an editable set of shapes onto the canvas — the AI output is real objects, not a flat image, so you can drag and relabel them. The free app has no AI at all.
Product Features
- Hand-drawn rendering via rough.js, with a real “sloppiness” slider.
- Live multiplayer, encrypted rooms, and shareable read-only links.
- Library of reusable shape packs (cloud architecture, UI wireframes).
- Export to PNG, SVG and a .excalidraw source file you can re-import.
- Embeddable as an npm component or via a script tag.
- Excalidraw+ adds version history, teams and AI text-to-diagram.
Product Highlights
- Low friction: open excalidraw.com and you are drawing in one second — no signup.
- Privacy by default: shared rooms are end-to-end encrypted.
- Presentable but casual: the sketch style signals “draft, give feedback” instead of “final spec”.
- Self-hostable: teams can run it behind a firewall.
Use Cases
- Whiteboarding a system design during a remote interview.
- Drawing UI wireframes before building them in Figma.
- Explaining an architecture to non-engineers without Visio.
- Sketching a sprint backlog board with the team live.
- Adding a diagram to docs that looks intentionally unfinished.
What are the limits?
The free web app stores drawings in your browser, so clearing site data can lose work — export or use Excalidraw+ if that matters. It is also not a precision tool: no smart connectors on the free tier, no auto-layout, and large diagrams get messy fast. If you need engineering-grade UML, look elsewhere.
Quick Summary
- Excalidraw is a free, open-source whiteboard with a distinctive hand-drawn style.
- AI text-to-diagram is a paid Excalidraw+ feature, roughly $6/month.
- Shared rooms are end-to-end encrypted and the app can be self-hosted.
- Great for rough design and interview sketches; not built for precise UML or large schemas.
