The free AI visibility check: about a minute, nothing to install, and it tells you whether there is a problem at all. If your pages live in Markdown files, run the free gates next, because they read every page rather than a sample. Everything paid on this page answers a question one of those two has already raised.

Are the free tools really free?

Yes. Six of the ten products are free. Three pieces of code are published on npm under the MIT licence: the gates, the MCP server and the audit engine behind the free check. They came out of the pipeline behind the brands on the cases page and they stay free. The paid ones start at $25, and the weekly subscription is on the pricing page.

Do the tools send data anywhere?

No. The gates, the starter, the MCP server and Pain to SEO run on your own machine, and Pain to SEO never uploads your conversations. The checks that read a site fetch its public pages the way a browser or a search engine would, and the paid reports keep your address only until the email has been sent.

Tools for content sites that have to rank, be cited and convert

Every product on this page came out of one pipeline, the one behind the thirteen sites on the cases page. Six are free and stay free. The other four have a price on the page, not in a call.

Not a developer? Start with the free AI visibility check (about a minute, nothing to install), then Watch or the one-off audit. Developers usually start with the gates and the starter. Fixes done for you are quoted on request.

Free tool Free check: can AI see your site AI visibility in one number: a score out of 100, five areas and the one fix that matters most. On screen, no signup. Whether ChatGPT, Perplexity, Copilot, Claude and Gemini can read, understand and cite your site. Free Get it Free, open source Sixteen checks that read every page for you Sixteen automated quality gates for content sites: cut titles, copied paragraphs, hollow sections, dead links, stale llms.txt, unsourced figures, a missing agent surface. One command, one config, MIT. Free Get it Free tool AI visit counter A free counter that shows how many people ChatGPT, Perplexity, Claude, Copilot and Gemini actually sent to your site. One line of code, or a WordPress plugin, and nothing about your visitors leaves the site. Seventeen assistants are told apart by name, from ChatGPT to Alice. Free Get it Free, on request A content site that is ready on day one An Astro starter with five content collections, an answer-first article layout, data cards, a generated llms.txt, an honest sitemap, twelve Cursor rules and the sixteen gates wired in. Free Get it Free, for Claude Code Content checks inside your editor Five commands, two skills, a reviewer agent and a post-edit hook that runs the fast gates on every content file Claude touches. Free. Free Get it Free, open source Check a site from inside Claude and Cursor Two ways in. The remote server needs only a URL and gives five free tools, scoring a site on the same five areas as the free check. The local npm package runs four tools on your machine, including the sixteen gates. Free, no account. Free Get it Course, 14 lessons Invisible to ChatGPT Fourteen lessons, a hundred minutes, on why a website is invisible to ChatGPT and Claude, how to check twenty of them in an hour, and what to charge to fix it. No terminal, no code, nothing installed. $25 See what you get Paid, one licence per owner From a recorded call to a published page Your buyers already told you what your site should say, on the phone and in chat, and nobody had time to read it back. Pain to SEO reads that pile, finds the questions your site never answers, checks that the page does not repeat one you already have, writes it against the same rules our own sites are held to, publishes it as a draft, and then opens the live address to make sure it is not broken. Everything runs on your own machine. $69 See what you get Paid, one licence Everything one person needs to launch a content site The starter plus the page generator, the niche discovery module, a WordPress importer, indexing runbooks and support: everything one person needs to launch a content site that passes the gates, or to move an old one onto them. $79, one licence per owner, unlimited sites, updates for a year. $79 See what you get Paid, per site Why nobody shows you, and what to put on the site so they do The flagship of OperStack and the reason the company exists at all. An audit of your site with the edits already made for you: a hundred pages, five rivals beside it, and three files you only have to put on the site. The report arrives within the hour; a person then goes over it by hand. One price: $149. $149 See what you get

Free tools

Six small tools, each answering one question about how AI assistants see a site: AI crawler access, text without JavaScript, schema markup, an llms.txt generator and checker, and AI visits in GA4. No signup, nothing stored.

All free tools →

Why I share this

I sell property to international buyers. It is a niche where a single advertising lead costs more than most products on this page, and where the buyer reads for weeks before writing to anyone. For years the enquiries came from paid ads. Then I built content sites that answer the questions those buyers ask, and the enquiries started arriving on their own: from Google first, then, more and more, from ChatGPT and Perplexity, which quote the pages when someone asks.

The numbers are on the cases page, site by site: clicks from Google up 249 percent across thirteen sites in more than ten countries, the first 28 days of June against the 28 days to 25 September 2026, and a new site that went from 3 clicks in its first 28 days to 98. Every tool on this page is a piece of the pipeline behind those sites, stripped of my data and packaged so you can run it in your own niche: the method for finding what a market actually searches for, the page shapes that get quoted, and the checks that stop a bad page from going live.

I am not a software company. I am an operator who got tired of paying for every lead, and these are the tools I use every week. If they work for you the way they work for me, tell me; if they do not, the refund policy says exactly what comes back and when.

Maksim Shchegolev, founder of OperStack · the numbers behind this · refund policy

Start with the gates

One command on your own site tells you whether you need anything else on this page.

npx @operstack/gates

Frequently asked questions

Which product first?: The free AI visibility check: about a minute, nothing to install, and it tells you whether there is a problem at all. If your pages live in Markdown files, run the free gates next, because they read every page rather than a sample. Everything paid on this page answers a question one of those two has already raised.
Are the free tools really free?: Yes. Six of the ten products are free. Three pieces of code are published on npm under the MIT licence: the gates, the MCP server and the audit engine behind the free check. They came out of the pipeline behind the brands on the cases page and they stay free. The paid ones start at $25, and the weekly subscription is on the pricing page.
Do the tools send data anywhere?: No. The gates, the starter, the MCP server and Pain to SEO run on your own machine, and Pain to SEO never uploads your conversations. The checks that read a site fetch its public pages the way a browser or a search engine would, and the paid reports keep your address only until the email has been sent.