Stacktree
By · Founder, Stacktree · Last updated
alternative

The ShareDuo alternative that is private by default.

ShareDuo and Stacktree both publish a Claude artifact over MCP and both keep links out of search. The split is the access model: a ShareDuo link is open to anyone who has it unless you add a password, while a Stacktree URL is unguessable by default, so the link is the credential. Stacktree adds an email-domain gate and a permanent free tier.

Get started free

What is the best ShareDuo alternative?

Stacktree, when you want the link itself to be the credential. ShareDuo and Stacktree both publish over MCP and both keep links out of search engines. The difference is access: a ShareDuo link is open to anyone who has it unless you set a password, while a Stacktree URL is unguessable by default, so possession of the link is the access control. Stacktree also adds an email-domain gate and a free tier with links that never expire.

Where ShareDuo fits

ShareDuo is a focused, well-made tool for one job: getting a Claude artifact onto a shareable URL fast. You paste or upload the artifact HTML and have a link in seconds with no account required, and Claude can push the artifact for you over ShareDuo's MCP integration. Links are kept out of search engines by default. The free tier already includes password protection and basic view analytics, with expiry capped at 1h/1d/7d. Plus, at $4.99/mo, adds 30-day and permanent links, Google Analytics, Search Console verification, and a custom subdomain. If you want the fastest path from artifact to a shareable link, that workflow is hard to beat.

ShareDuo vs Stacktree

Both products publish over MCP and both keep links out of search. Stacktree starts from a different default for who can open the link. A ShareDuo link is public-access on a short URL scheme: anyone who has it can open it unless you turn on a password. A Stacktree URL is long and unguessable, so the link itself is the credential, and you can layer an email-domain gate on top so only verified addresses at a given domain get in.

  • The link is the credential. Every Stacktree URL is unguessable, so only people you send it to can reach it. A ShareDuo link is open to anyone who has it unless you add a password.
  • Email-domain gate. Restrict a link to verified addresses at a domain with magic-link verification. ShareDuo offers password protection but no domain gate.
  • Replace-in-place via the agent's own tool call. update_site reuses the same slug, so the link you shared yesterday shows today's version, driven by the agent inside the loop.
  • Permanent free tier. Free Stacktree links do not expire. ShareDuo's free tier caps expiry at 1h/1d/7d; permanent links need Plus.
  • Flat pricing. $0 forever, then flat $8 and $19 plans, never per-seat.

When to pick which

Pick ShareDuo if you want the fastest upload-to-link path with free password and analytics, and a public-access link is fine. Pick Stacktree if you want the link itself to be the access control, an email-domain gate, free links that never expire, and one stable URL the agent updates in place across runs.

ShareDuo vs Stacktree

Criterion ShareDuo Stacktree
Link is the credential by default No: public-access link, optional password. Yes: unguessable URL gates access.
Kept out of search engines Yes: noindex by default. Yes: no public listing or indexing.
Agent publishes via MCP Yes: push_artifact. Yes: publish_html.
Replace-in-place URL Yes: versioning to update the link. Yes: update_site keeps the slug.
Password protection Yes: free. Yes: set per link.
Email-domain gate No. Yes: magic-link verified.
Expiry control Yes: free capped at 1h/1d/7d. Yes: any link, set by the agent.
Permanent free links No: permanent needs Plus. Yes: free links never expire.
View analytics Yes: free basic; Google Analytics on Plus. Basic: dashboard view counts.
No account to start Yes. Yes: anonymous first publish, no card.
Custom domain Yes: custom subdomain on Plus. Yes: Pro plan or pay-to-provision.
Pricing model Free + Plus $4.99/mo. Free + flat $8/$19, no per-seat.
Best for Fast public-access share with analytics. Private-by-default, link-as-credential.
FAQ

Frequent questions

What is the best ShareDuo alternative? +
Stacktree, when you want the link itself to be the credential. ShareDuo and Stacktree both publish a Claude artifact over MCP and both keep links out of search. The difference is the access model: a ShareDuo link is open to anyone who has it unless you add a password, while a Stacktree URL is unguessable by default, so possession of the link is the access control. Stacktree also adds an email-domain gate and a permanent free tier.
What is the difference between ShareDuo and Stacktree? +
Both are MCP servers that let Claude publish an artifact mid-conversation and get a URL back, and both keep links out of search engines. ShareDuo returns a public-access link (anyone with it can open it, password optional) on a short URL scheme. Stacktree returns an unguessable URL that acts as the credential by default, adds an email-domain gate with magic-link verification, and replaces content in place with update_site. Both host the same static HTML; the split is the default access model and the free tier.
Is there a private alternative to ShareDuo for Claude artifacts? +
Yes. Both ShareDuo and Stacktree keep links out of search engines by default. The difference is access: a ShareDuo link is open to anyone who has it unless you set a password, whereas a Stacktree URL is long and unguessable, so the link itself is the access control. Stacktree also offers an email-domain gate so only verified addresses at a given domain can open a link.
Can my agent publish to Stacktree directly? +
Yes. Stacktree exposes an MCP server at api.stacktr.ee/mcp. The agent calls publish_html({ file }) and gets back a private URL, then update_site reuses the same slug to replace the content in place, and delete_site burns it. ShareDuo also has an MCP integration that lets Claude push an artifact and return a URL; the difference is what the URL is and how it is gated, not whether an agent can publish.
How does pricing compare to ShareDuo? +
ShareDuo has a free tier (expiry capped at 1 hour, 1 day, or 7 days) and a Plus tier at $4.99/month that adds 30-day and permanent links, Google Analytics, Google Search Console verification, a custom subdomain, and a 10 active-artifact limit. Stacktree has a permanent free tier with links that do not expire, plus flat plans at $8/mo Pro and $19/mo Agent and no per-seat fees. Stacktree also offers one-time pay-to-provision unlocks, such as a custom domain for a single link.
Does ShareDuo support expiry, passwords, and analytics? +
Yes, and most of it is on the free tier. ShareDuo offers password protection and basic view analytics for free, with expiry capped at 1h/1d/7d on free and 30-day or permanent links on Plus. Plus also adds Google Analytics, Search Console verification, and a custom subdomain. Stacktree offers per-link gating (password, email-domain gate, expiry) set by the agent through tool calls rather than a human toggling it in a dashboard.
Do recipients need an account to open a Stacktree link? +
No. Like ShareDuo, anyone with the link can open it with no login and no Claude account. The difference is the default: a Stacktree URL is unguessable, so only people you send the link to can reach it, while a ShareDuo link is open to anyone who has it unless you add a password.
Keep reading

Related guides

References

Sources and further reading

Publish agent HTML where the link is the credential.

Start free. Wire in the MCP server and your agent publishes a private, unguessable URL in one call.

Sign up free →