ProtonLoop 2.0|Direct Claude & Cursor MCP Integration

Get feedback on
anything you create.

Share AI-built prototypes, Claude artifacts, and HTML mockups with your team. Collect spatial pinned notes directly on canvas with zero login friction.

Drop your files to start a review

or click to browse · ⌘V to paste from clipboard

HTML & Artifacts Markdown / Specs PNG / WebP / SVG Multi-page decks

Private by default. Visible only to people with your link.Try interactive live demo

0 Auth

Frictionless guest reviews

30 Seconds

Claude & Cursor MCP setup

Spatial Notes

Pixel-accurate pinned canvas

Bi-Directional

Auto-apply feedback in chat

How It Works

From raw prompt to resolved review in 4 steps

Designed for engineers, PMs, and designers collaborating on AI-generated interfaces.

Upload & Connect

Drop what you just built, or prompt directly

Upload HTML files, screenshots, PDFs, or React artifacts. Or don't even leave your AI model: tell Claude "Make this a ProtonLoop" and get an instant shareable link in chat.

Claude MCP Connector setup

Frictionless Sharing

One link, unfurled beautifully

Hosted cleanly on high-speed CDN. Unfurls with dynamic previews in Slack, Teams, and Discord. No login walls, sign-up forms, or password barriers for your teammates.

product-design2:14 PM

Zach shared a new prototype

protonloop.com/p/pricing-revamp-v2

3 pinned notes open · 2 reviewers active

Spatial Pinned Notes

Pin feedback directly to the element

Notes pin to the exact pixel and DOM component. Live presence lets you see when your team is reviewing. Ship V2 and previous notes stay tethered to their original version.

Live receipt: "Viewed by Maya Lin · 2m ago"

The Autonomous Loop

Feedback automatically refactors the code

Pull open notes directly into Claude or Cursor. Claude parses the spatial feedback, edits the artifact, resolves comments, and deploys V2 automatically.

Prompt to Claude:MCP Connected

"Pull open ProtonLoop notes for the hero section and rewrite the headline."

Applied 3 notes · Deployed V4 to protonloop.com/p/hero-v4

Platform Capabilities

Built specifically for the AI prototyping era

Multi-File Project Decks

Upload multiple HTML files or mockups together. They automatically organize into a navigable multi-page project with unified notes.

Version Time-Travel

Toggle between V1, V2, and V3 effortlessly. Notes stay anchored to their specific version so historical feedback is never misplaced.

Real-Time Read Receipts

Never wonder if your team looked at your prototype. Get instant feedback on who viewed, at what time, and what device they used.

Native Claude MCP Server

Full Model Context Protocol support. Pull open notes, query reviewer sentiment, and push updated artifacts without leaving Claude chat.

Private By Default

Only people with your direct URL can access your builds. Regenerate or invalidate links at any time with a single click.

Zero-Latency Global Edge CDN

Prototypes render instantly worldwide with global edge asset caching and optimized sandboxed iframes.

Start collecting spatial feedback today.

Drop your first HTML file or Claude artifact on protonloop.com. Start your 14-day Pro trial with unlimited prototypes.

Explore Live Sandbox Setup Claude MCP

Get feedback onanything you create.