Compare · Stacktree
Stacktree and HTMLRadar both track HTML. Here is the difference.
Stacktree is built for client work on your own domain. It lists attention by section on its $79-a-month Studio plan. Its $19 Solo plan shows opens, unique viewers and the last open. HTMLRadar gives each reader a link of their own and reports the time on each section. HTMLRadar’s two free links stay live until you set an expiry or switch them off. Stacktree’s three free pages are live for seven days at first. Once someone else opens a page, it remains available for 30 days after the latest visit, up to 90 days in total (source 3).
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Competitor facts checked 4 November 2026
Side by side
| What you need | HTMLRadar | Stacktree |
|---|---|---|
| Feature | ||
| What it is | A tracked link for one HTML file or URL | “Turn reports, audits and proposals into private pages on your own domain.”1 |
| Getting the HTML in | Upload an HTML file or paste a URL you already host | “Add the MCP server and your agent publishes to a private link. No build, no DNS.”2 |
| Reading detail | Which sections or slides were read, active time, and scroll depth inside the HTML | Solo: “opens, unique viewers, last opened”. Studio: “time on page, scroll depth, attention by section”. Free: “you are told a page was opened, but viewer numbers are locked”.3 |
| Controls on the link | Optional email gate, password, expiry, allow-list, and revocation | Every plan has “private unguessable URLs” and “expiry and burn-after-read”. A passcode gate is on every page; “Email-domain gate: not available on this plan” on Free, “Passcode + email gates: unlimited” on Solo.3 |
| Price, checked 4 November 2026 | Two tracked links free, then $19 a month or $190 a year | Free: $0, three pages in total with a “Made with Stacktree” footer. Each page is live for seven days at first. Once someone else opens a page, it remains available for 30 days after the latest visit, up to 90 days in total. Solo: $19 a month. Studio: $79 a month. Firm: $249 a month.3 |
HTMLRadar
Feature
- What it is
- A tracked link for one HTML file or URL
- Getting the HTML in
- Upload an HTML file or paste a URL you already host
- Reading detail
- Which sections or slides were read, active time, and scroll depth inside the HTML
- Controls on the link
- Optional email gate, password, expiry, allow-list, and revocation
- Price, checked 4 November 2026
- Two tracked links free, then $19 a month or $190 a year
Stacktree
Feature
- What it is
- “Turn reports, audits and proposals into private pages on your own domain.”1
- Getting the HTML in
- “Add the MCP server and your agent publishes to a private link. No build, no DNS.”2
- Reading detail
- Solo: “opens, unique viewers, last opened”. Studio: “time on page, scroll depth, attention by section”. Free: “you are told a page was opened, but viewer numbers are locked”.3
- Controls on the link
- Every plan has “private unguessable URLs” and “expiry and burn-after-read”. A passcode gate is on every page; “Email-domain gate: not available on this plan” on Free, “Passcode + email gates: unlimited” on Solo.3
- Price, checked 4 November 2026
- Free: $0, three pages in total with a “Made with Stacktree” footer. Each page is live for seven days at first. Once someone else opens a page, it remains available for 30 days after the latest visit, up to 90 days in total. Solo: $19 a month. Studio: $79 a month. Firm: $249 a month.3
Sources
- 1Stacktree’s homepage, on stacktr.ee, read 4 November 2026.
- 2Stacktree’s developer page, on stacktr.ee, read 4 November 2026.
- 3Stacktree’s pricing page, with its plans, analytics and free-page expiry, read 4 November 2026.
Stacktree’s site describes one address per client where everything collects, your own domain on the page, and an MCP server so an agent can publish without a build step or DNS. It is built for the problem of work that keeps arriving as attachments.
HTMLRadar does not try to be a place your work lives. It is a tracked link for one HTML file or one URL, sent per recipient, with the reading reported back section by section. If you already have somewhere to put the page, this is the measurement layer.
What Stacktree is built for
You want a client portal on your own custom domain and an MCP server so your agent can publish directly. Custom domains and one client space start at $19 a month on Solo; their free plan includes three pages with a “Made with Stacktree” footer. Each page is live for seven days at first. Once someone else opens a page, it remains available for 30 days after the latest visit, up to 90 days in total (source 3).
Where HTMLRadar fits
You are sending one HTML file, whether uploaded or a URL you already host, to named people and want section-level reading reported back per recipient. The free tier is two tracked links that remain live unless you set an expiry or revoke them, then $19 a month or $190 a year.
What is the difference between Stacktree and HTMLRadar?
Stacktree is built for a deliverable that needs to live somewhere: their site describes private pages on your own domain, one address per client where the work collects, and publishing straight from an agent through their MCP server. HTMLRadar fits when you are sending one HTML file to named people and the question is which sections they read.
Both products mention sections. Are they measuring the same thing?
Partly. On 4 November 2026 Stacktree’s pricing page listed opens, unique viewers and the last open on its $19 Solo plan, and time on page, scroll depth and attention by section on its $79 Studio plan. HTMLRadar reports the time on each section inside the HTML, alongside active time and scroll depth, and gives each recipient their own link so the reading is attributable per person.