You shared a Claude artifact link. Your recipient clicked it and got a login screen. The artifact isn't broken — it's a fundamental limitation of how Claude shares content. Here's what's happening and how to fix it in under a minute.

Why Claude artifact links require an account

When you click Publish in Claude, the artifact is hosted on claude.ai. That domain requires authentication. Claude has no way to serve the artifact without also serving the claude.ai interface — which means viewers need to be logged in.

This isn't a bug and Anthropic hasn't indicated they plan to change it. It's just how the product is built today.

Who gets blocked

Anyone without a Claude account
Anyone with a Claude free plan (some artifact features require Pro)
Anyone clicking the link on a device where they're not logged in to Claude
Anyone in a company where claude.ai is blocked by their IT policy

The fix: host the HTML outside Claude

Every Claude artifact is standard HTML. If you host that HTML somewhere other than claude.ai, anyone can view it — no account, no subscription, no login.

ShareDuo is the quickest way to do this.

How to fix it right now

Get the HTML. In Claude, click the download icon on the artifact panel, or ask Claude: "Give me the full HTML."
Go to shareduo.com. Drop the file or paste the HTML.
Upload. You get a new link instantly — this one works for everyone.
Resend the new link. Your recipient clicks it, the artifact loads directly in their browser. No login prompt.

The whole process takes about 30 seconds.

Will the artifact look the same?

Yes. ShareDuo serves the HTML exactly as Claude wrote it, on a separate preview domain that allows CDN scripts, Google Fonts, and all the libraries Claude typically uses. Your chart, game, or dashboard will render identically.

What about future updates?

If you update the artifact in Claude and want to re-share, upload again — you'll get a new link. ShareDuo also lets you choose an expiry window, so temporary shares don't linger indefinitely.