How to vibe codeExcalidraw
Virtual, infinite-canvas collaborative whiteboard and diagramming tool
plus.excalidraw.com ↗Productivity / Collaboration
The verdict: can you vibe code Excalidraw?
You can build a single-user local canvas clone over a few weekends, but building a production-grade multi-user collaborative whiteboard with a custom hand-drawn rendering engine is a serious undertaking.
While the core open-source editor code is publicly available, vibecoding a personal-use clone of Excalidraw+ requires tackling complex real-time synchronization states, multi-user WebSocket rooms, and infinite canvas rendering performance. An AI coding agent will effortlessly scaffold the Next.js frontend and database schema, but debugging CRDT conflict resolution, fractional indexing for element stacking, and custom vector rendering math will demand rigorous iterative engineering.
Estimated effort: 4-6 weeks of intense building and debugging
What you can't replicate
- The massive organic community and pre-built public component libraries
- The exact battle-tested real-time WebSocket infrastructure handling millions of concurrent collaborative strokes
- The robust enterprise compliance, SOC2 certification, and third-party plugin ecosystem
Founded
2020
Raised
—
Team
~6 core members
Cheapest paid tier
$0
What Excalidraw does
Excalidraw is a virtual, infinite-canvas collaborative whiteboard and diagramming tool optimized for creating hand-drawn-style sketches, flowcharts, system architectures, wireframes, and presentations. Its Plus tier adds team workspace management, cloud synchronization, real-time collaboration, presentations, and generative AI features.
Core features
- Infinite canvas with pan, zoom, and spatial indexing
- Hand-drawn vector rendering engine using Rough.js style algorithms
- Real-time multi-user collaboration via WebSockets and CRDTs/fractional indexing
- Scene serialization and export to PNG, SVG, and JSON
- Shape binding, arrows, text editing, and freehand drawing
- Slide presentation mode and frame management
- Generative AI integrations (Text-to-diagram, Mermaid syntax support)
The business
Pricing
- Free$0
- Plus$6/mo per user
Funding
Unknown / bootstrapped
Pay vs build, cumulative
Break-even at month 11 — after that, every month is money kept.
The hard parts of vibe coding Excalidraw
- Replicating the chaotic, imperfect hand-drawn vector aesthetic without performance degradation on thousands of elements
- Implementing conflict-free real-time multi-user canvas synchronization and element ordering
- High-performance viewport culling and spatial indexing to keep infinite canvas panning at 60 FPS
- Accurate SVG and high-resolution PNG export of vector shapes without font scaling or clipping bugs
How to vibecode Excalidraw
Prerequisites
Node.jsfree
Required runtime for running Next.js and frontend build tools
GitHubfree
Repository hosting and CI/CD integration for deployment
AI coding tools
Recommended stack
| Frontend | Next.js with React, Tailwind CSS, HTML5 Canvas / SVG, Rough.js |
|---|---|
| Backend | Node.js with WebSockets (ws library) |
| Database | Turso (SQLite at the edge for scene metadata and user storage) |
| Auth | better-auth |
| Payments | Stripe |
| Other | Liveblocks for real-time presence and collaborative state synchronization, Zod for schema validation |
Build guide
01Project Scaffolding & Database Schema
Initialize the Next.js application with Tailwind CSS, configure Turso SQLite connection via Drizzle ORM, and set up better-auth for user authentication.
Create a new Next.js 16 project with TypeScript and Tailwind CSS v4. Set up Drizzle ORM configured for Turso SQLite. Create database schemas for users, workspaces, scenes (storing element JSON arrays), and collections. Implement better-auth with email/password authentication and session management. Ensure clean project directory structure with api routes and component folders.02Infinite Canvas Viewport & Tooling
Build the core interactive infinite canvas component supporting pan, zoom, and drawing tool selection (rectangle, diamond, ellipse, arrow, line, freedraw, text).
Build an infinite canvas React component using HTML5 Canvas or SVG layers. Implement mouse and touch event handlers for panning (space+drag or middle click) and zooming (wheel scaling clamped between 0.1x and 20x). Create a toolbar UI state machine supporting select, rectangle, diamond, ellipse, arrow, line, text, and freedraw tools. Store canvas elements in React state with unique IDs, coordinates, bounding boxes, and styling attributes.03Hand-Drawn Vector Rendering Engine
Integrate Rough.js or custom jitter algorithms to render shapes with the signature imperfect, sketchy hand-drawn aesthetic.
Integrate Rough.js into the canvas rendering loop to draw all geometric shapes, lines, and arrows with a hand-drawn sketchy aesthetic. Add support for customizable stroke color, background fill style (hachure, cross-hatch, solid), stroke width, and roughness parameters. Ensure smooth rendering performance during viewport movement and element selection transforms.04Real-Time Collaboration & CRDT Synchronization
Set up a WebSocket server and integrate Liveblocks or custom Yjs CRDT bindings to broadcast cursor positions and element modifications across users.
Implement real-time collaboration using Liveblocks or a standalone Node.js WebSocket server deployed on Fly.io. Broadcast active user cursors, viewport bounding boxes, and incremental element mutations (creation, updates, deletions) across connected clients. Handle conflict resolution using fractional indexing for element ordering layers to prevent race conditions during simultaneous editing.05Scene Management, Export & Presentations
Build dashboard scene organization, JSON/PNG/SVG export handlers, and slide presentation mode with frame grouping.
Implement scene management features including dashboard workspace folders, autosaving scene data to Turso, and full JSON file import/export. Create export utilities to convert canvas elements into high-resolution PNG and clean SVG strings. Add a slide presentation mode that cycles through user-defined 'frame' elements in sequential order with smooth pan-and-zoom camera transitions.
Cost vs paying for Excalidraw
What will you build it with?
Starting total with Claude Code$0 one-time
Starting costs (one-time)
- AI Coding Assistant (Claude Pro / Cursor)$20
Total$20 one-time
Ongoing costs (monthly)
- Fly.io WebSocket Server~$3-5/mo
- Turso DB & Vercel$0/mo
Total~$3-5/mo
Paying for Excalidraw
$6/mo per user
Your time to build
40-60 hours
AI tool credits
$20 (one month of Claude Pro / Cursor)
Break-even
1 month of Plus subscription
Vibe code Excalidraw: FAQ
- Can you vibe code Excalidraw yourself?
- Serious undertaking — 45/100 vibecodeable. You can build a single-user local canvas clone over a few weekends, but building a production-grade multi-user collaborative whiteboard with a custom hand-drawn rendering engine is a serious undertaking.
- How long does it take to vibe code Excalidraw?
- 4-6 weeks of intense building and debugging — roughly 40-60 hours of hands-on time with an AI coding agent.
- How do you build your own Excalidraw?
- Scoped to personal use: Next.js with React, Tailwind CSS, HTML5 Canvas / SVG, Rough.js on the front, Node.js with WebSockets (ws library) behind it, Turso (SQLite at the edge for scene metadata and user storage) for data. Follow the 5-step build guide on this page — each step has a paste-ready prompt for an AI coding agent.
- How do you code your own Excalidraw without being an expert?
- Use an AI coding tool (Claude Code or Cursor) and work in small steps: scaffold, data model, core screens, then deploy. Realistic effort: 4-6 weeks of intense building and debugging. The prompts on this page are written so the AI does the heavy lifting.
- How much does it cost to vibe code Excalidraw instead of paying?
- About $20 one-time to start and ~$3-5/mo to run, versus $6/mo per user for Excalidraw. Break-even: 1 month of Plus subscription.
- What stack should you use to vibe code Excalidraw?
- Next.js with React, Tailwind CSS, HTML5 Canvas / SVG, Rough.js; Node.js with WebSockets (ws library); Turso (SQLite at the edge for scene metadata and user storage); plus Liveblocks for real-time presence and collaborative state synchronization, Zod for schema validation.