OnTheStacks
not read yet
Use
- For
- Website owners and developers who want to improve how machines read and act on their public site
- Runs as
- API
- Used for
- check which public signals a site exposes to machines
- turn inspection findings into a prioritized remediation plan
- prepare approved schema, metadata, or configuration changes
- Has an MCP server (1 in the registry)public registry →
- Publishes llms.txt, a file written for AI assistantsonthestacks.dev ↗
- MCP serverdev.onthestacks/machine-presence-inspectorverified in the MCP registry
- Stateanswers, 1 toolschecked 2026-10-26
- Address to connectmcp.onthestacks.dev/mcp
- MCP docsonthestacks.dev/connect.htmlthe vendor's page ↗
This card as JSON, for your agent →
Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.
Figure and bar: visits/mo, estimate · year: online since
- #1
CoresignalMCP · sign-in
Delivers company, employee, job and social-post records scraped from public web sources as bulk datasets or query APIs.
13.8kFrom $49/mo2016 - #2
Spider.cloudMCP · sign-in
Crawls and scrapes websites through its own browser engine and proxy network, returning each page as streamed markdown or JSON.
1.4kActiveFrom $1 per use2023 - #3
VisibilityKit
Crawls your site on your own machine and re-checks each fix against what the server returns, driven by an MCP-ready AI client.
86MaintainedFrom $79/mo - #4
Cobalt CaptureMCP · open
Captures annotated screenshots with narration, or has an AI run studies on a URL, and publishes reviews agents can read as markdown.
26ActiveFrom $5/mo - #5
ToolTraceMCP · open
Runs free web checks such as email verification, page scraping, SEO inspection and link extraction, with matching APIs.
10ActiveFrom $9.50/mo - #6
AI search visibilityMCP · open
Checks whether AI search crawlers may fetch a site's robots.txt and homepage, and generates or validates llms.txt files.
4
Not it? Say what you need
betaThree tools from the Atlas for the job you describe, each with what fits and what does not.
No notes yet. What do you use OnTheStacks for?
Sign in to leave a noteWhat is OnTheStacks?
Inspects public websites for machine-readable signals such as crawler rules, structured data and declared APIs, returning sourced findings. It is listed in the Atlas under Data.
Who is OnTheStacks for?
Website owners and developers who want to improve how machines read and act on their public site
Do people use OnTheStacks?
Little sign of use.
What are alternatives to OnTheStacks?
In Data, by use: Coresignal, Spider.cloud, VisibilityKit, Cobalt Capture, ToolTrace, AI search visibility.
How we read a tool
No votes, no reviews, no vendor claims. Every week a crawler reads each tool's own site and a few public registries, and the words on the card are bands over what it read.
- Use: visits to the site (estimated), installs from npm and PyPI, presence in Chrome's usage report.
- Activity: the newest release on GitHub, npm or PyPI; the newest dated page on the site; open roles on a public jobs board.
- Price: the vendor's own pricing page, read with the date. A figure is printed only when it is on that page.
- The line and the use cases are written by us from the homepage, one tool at a time, and refused when they repeat the vendor's marketing.
How AI assistants read each site — the reading vendors ask us about — is on each tool's own visibility page.
How we read every tool → · By INITE Atlas Desk
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Before we count this visit
Analytics and ad measurement tell us which pages and which of our ads do their job: Google Analytics and Google Ads, the Meta pixel, Yandex Metrica, and one first-party id of our own. Nothing is stored until you answer, and declining changes nothing about the site.