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 a company-email gate, notes the client leaves on the page itself, and a domain you own with no vendor badge from $19 a month.

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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 verified by magic link, on-page client feedback the agent reads back, and a page served from a domain you own with no vendor badge on paid plans.

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 domain. If you want the fastest path from artifact to a shareable link, that workflow is hard to beat, and its free tier is more generous than ours: Stacktree free is a 3-page trial where pages last 7 days, or once someone else opens one, 30 days after their latest visit, up to 90 days in total, with passcodes on the paid plans.

Where Stacktree differs

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.
  • Still no account for the viewer. Neither product makes the recipient sign up, and Stacktree keeps that true after you gate the page: a passcode or a one-time magic link is not a signup. Your client never ends up with credentials for a vendor they did not pick.
  • 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. The gates, the expiry, and the feedback queue are tool calls too, so an unattended run can publish, lock, and later read the client's notes without a human in the dashboard.
  • The client answers on the page. Viewers react and leave notes anchored to the exact element, with no account. The agent reads them back with list_feedback, ships the fix to the same URL, and resolves them. ShareDuo reports who looked; Stacktree carries back what they said.
  • Your domain, with no vendor badge. Stacktree serves the page from a hostname you own, reports.youragency.com, with automatic SSL: one domain on Solo at $19 a month, ten on Studio at $79. Paid pages also drop the Stacktree badge, so nothing on the deliverable names a vendor. ShareDuo Plus includes a custom domain too; its homepage gives prototype.yourdomain.com as the example (checked 30 September 2026).

What each will host

ShareDuo's homepage lists HTML, React, SVG, Mermaid diagrams, games, calculators and dashboards, which it sums up as anything Claude produces as a static artifact (checked 30 September 2026). Stacktree is deliberately narrower: static HTML only, with no build pipeline, no server logic and no in-browser editor. What the agent publishes is what the viewer gets, and to change it the agent publishes again to the same URL.

Pricing: by the month or by the page

On 30 September 2026 ShareDuo's homepage listed Plus at $4.99 a month, shown as a reduction from $9.99, so check its current price before you quote it. Stacktree's plans are flat per workspace and never per seat: Solo at $19, Studio at $79, Firm at $249. An agent can also skip the plan and pay for one unlock at a time over x402, in USDC with no card: after a $1 call that gives it a lasting identity, $5 to make one page permanent, $5 per 30 days for a domain slot, or $25 per 30 days for higher limits. That suits a pipeline that runs unattended with nobody to sign up for a subscription.

When to pick which

Pick ShareDuo if you want the fastest upload-to-link path, a free password, and built-in view analytics, and a public-access link is fine. Its free tier is genuinely the more generous one.

Pick Stacktree if the page is going to a client: the link itself is the access control, the company-email gate keeps a forwarded URL from opening, the client leaves notes on the page for your agent to act on, and from $19 a month the whole thing arrives on your own domain with no third-party branding. See pricing for the ladder.

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: per link, from Solo $19/mo.
Email-domain gate No. Yes: magic-link verified, from Solo.
Viewer account to open a gated page None. None: passcode or one-time magic link.
Expiry control Yes: free capped at 1h/1d/7d. Yes: 7 days on free (once someone else opens a page, 30 days after their latest visit, up to 90 in total), any length once paid.
Permanent links Plus, $4.99/mo. Solo, $19/mo. Or $5 per page over x402.
Free tier More generous: password and analytics included. A trial: 3 pages, 7 days each (30 days after someone else's latest visit once they open one, up to 90 in total), badge on.
View analytics Yes: free basic; Google Analytics on Plus. Opens and readers from Solo; time, scroll and attention on Studio.
On-page client feedback No. Yes: anchored notes the agent reads over MCP.
No account to start Yes. Yes: anonymous first publish, no card, lives 24 hours.
Custom domain On Plus: a domain you own, such as prototype.yourdomain.com. A hostname you own. 1 on Solo, 10 on Studio, or $5 per 30 days over x402.
Vendor branding on the page Not documented. Badge on free, gone on every paid plan.
Pricing model Free + Plus $4.99/mo. Free trial + flat $19/$79/$249, no per-seat.
Best for Fast public-access share with analytics. Client delivery: private, gated, on your domain.
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 adds a company-email gate, on-page client feedback the agent reads back, and a domain you own with no vendor badge on paid plans.
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, replaces content in place with update_site, and serves the page from your own domain on the paid plans. Both host the same static HTML; the split is the default access model and who the finished page looks like it came from.
ShareDuo or Stacktree: which should I choose? +
Choose ShareDuo if you want the quickest upload-to-link path, a free password and built-in view analytics, and a public-access link is fine. Choose Stacktree if the page is going to a client: the unguessable URL is the access control, the company-email gate stops a forwarded link from opening, the client leaves notes on the page for your agent to act on, and from $19 a month the page arrives on a domain you own with no vendor badge.
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.
Can I update a ShareDuo or Stacktree page without changing the link? +
Yes, on both. ShareDuo lists versioning, which updates an artifact without breaking its link. On Stacktree the agent calls update_site with the same slug, so the link you sent yesterday shows today's version, and an agent can keep revising behind that one link across as many runs as it takes.
How does pricing compare to ShareDuo? +
They are priced for different jobs. 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 domain, and a 10 active-artifact limit. Stacktree free is a 3-page trial where pages last 7 days, or once someone else opens one, 30 days after their latest visit, up to 90 days in total, then flat plans: Solo at $19/mo for permanent pages, passcodes and email gates, one domain you own and no Stacktree badge; Studio at $79 for ten domains and engagement analytics. ShareDuo is the cheaper way to park an artifact somewhere; Stacktree is priced as the way you hand work to a paying client.
Does ShareDuo support expiry, passwords, and analytics? +
Yes, and more of it is free than on Stacktree. ShareDuo offers password protection and basic view analytics on its free tier, 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 domain. On Stacktree, passcodes and email gates start on Solo at $19 a month. What you get for that is a gate the agent sets through a tool call rather than a human toggling a dashboard, plus a company-email gate ShareDuo has no equivalent for.
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. That stays true even once the page is gated: a passcode or a one-time magic link to a work address is not a signup, so your client never creates an account with a vendor they did not choose. The difference in the default is that 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.
Can the client comment on the page? +
On Stacktree, yes. Switch on the on-page toolbar and a viewer can react and leave a note anchored to the element they are looking at, no account needed. Your agent reads those notes back over MCP with list_feedback, publishes the fix to the same URL, and marks them resolved. ShareDuo documents view analytics but no viewer-feedback channel, so revisions round-trip through email instead.
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