Zero Auth Needed • Ephemeral & Completely Private

The Internet "Napkin" for Your Next Big Idea

You heard about founders diagramming their initial business plan or tech stack on a napkin which led them to found billion dollar companies. CollabDraw is the Internet napkin where you and your teams can build the next billion dollar companies. Or just do the next User Story on the board.

Zero Barrier Privacy

No Sign Up / No 2FA

Rust Axum Engine

Instant Permanent Delete

Zero Entry Barrier

Why Founders & Teams Choose CollabDraw

Built specifically for raw, uninterrupted creative momentum without sign-up friction.

No Sign Up, No 2FA

Absolutely low entry barrier. Leave alone 2FA or MFA authentication flows. Simply open the page and start diagramming instantly with your peers.

Transient & Completely Private

Your live diagram remains private while active. Take a screenshot to save or export (PDF export coming in next release) and everything is permanently deleted.

Zero Learning Curve

Draw rectangles, squares, circles, link arrows (solid, dotted, dashed), change stroke colors, group move, group delete, undo, redo, and chat live effortlessly.

Full Feature Suite

Everything to Blueprint Your Next Breakthrough

Geometric Primitives

Rectangles, squares, circles, and text nodes with customizable fill and border tones.

Connectors & Arrows

Connect diagram nodes with flexible solid, dotted, or dashed line connectors.

Group Manipulation

Select multiple items to move or delete in groups, plus full multi-level undo and redo.

Live Participants

See active teammates with real-time colored cursors moving across the shared canvas.

In-Context Session Chat

Chat with your team in real time directly alongside the napkin diagram workspace.

Snapshots & Upcoming PDF

Export PNG snapshots immediately, with vector PDF export arriving in the upcoming release.

Architectural Excellence

Rust Axum Backend + HTMX & Bun

CollabDraw is extremely performant and operates near real-time without reloads or refreshes.

Rust Axum Concurrency

Ultra-low latency SSE (Server Side Events) broadcasting with high reliability.

HTMX + Bun JS

No refresh required. Hypermedia-driven UI with instant asset bundling.

Responsible AI Engineering

Built with AI assistance in a very responsible way. No code that is not reviewed or understood ever gets committed.

src/main.rs (Axum Router) Near Real-Time

use axum::{routing::get, Router};
use askama::Template;

// Zero persistence - ephemeral room broadcast
#[tokio::main]
async fn main() {
    let app = Router::new()
        .route("/canvas/stream", get(handle_canvas_stream));

    let listener = tokio::net::TcpListener::bind("0.0.0.0:3000").await.unwrap();
    axum::serve(listener, app).await.unwrap();
}

Collab Draw