Your site looks perfect.
To an AI it may be blank.

It doesn't matter who built it: you with an AI, an agency or WordPress. ChatGPT, Claude and Perplexity don't run your JavaScript1. They take the HTML exactly as it arrives.

No sign-up, no card · Results in 15–40 seconds · Every major AI crawler checked

1Google does run it for Search. AI crawlers, as a rule, don't: that's how a site can do well on Google and not exist for ChatGPT.

Fig. 1 Harbor Cyclery, a made-up site, read twice: by a person and by GPTBot. Everything the person sees is painted by JavaScript; the crawler gets one empty block.

We check access for

  • ChatGPT
  • Claude
  • Perplexity
  • Google
  • Gemini
  • Apple Intelligence
  • Meta AI
  • Copilot
  • Bing

How it works

  1. We open your site twice. Once in a real browser, like a customer. Once the way GPTBot opens it: HTML and nothing else.
  2. We compare it sentence by sentence. Anything visible on screen but missing from the HTML is content the AI never reads.
  3. We give you the score and what's wrong. 0 to 100, with problems ordered by what they cost you. In under 2 minutes, no sign-up.
  4. And we write the fix for you. A prompt with the whole diagnosis inside. You paste it into your AI and it does the work. That's the paid part.
See what an AI gets from my site
Fig. 2 Step 2 on the made-up site above: every sentence a customer reads, and whether GPTBot receives it. Only the title gets through.

You don't need to have vibe-coded it

Just want to know if your site is slow?

That too. The report includes measurements from Google PageSpeed Insights: performance, accessibility, best practices and SEO, plus the loading metrics Google uses to decide whether your page is fast.

Measure my site
Fig. 3 Harbor Cyclery's speed measured with Google PageSpeed on a phone, as it appears in the report. A slow but tidy site, which is what usually turns up.

The paid part

The diagnosis is free.
The fix costs 19 €$19.

The report comes with a prompt several thousand words long, written for your site: every problem, the exact change to make, and how to verify it worked. You copy it, paste it into Claude, ChatGPT, Cursor or Copilot, and the AI does the work. It doesn't need to see your site: the diagnosis is inside it.

See what's broken on my siteSee a full sample report
fix-yoursite.com.md3,000+ words
# Task: make my site readable to  AI search engines ## Context- Current score: 36/100 (grade F)- Human/AI parity: 57 words  against 2 (0%) ## Blockers### 1. An AI sees 0% of your siteWhat to do: server-render the routesthat carry content…
Fig. 4 The opening of the prompt from a real report. It goes on for over three thousand words, with every problem, the change to make and how to check it.

Included in the report

Side by side with your competition

When someone asks an AI about your line of business, your site isn't judged against an ideal: it's up against your competitors' sites. Add two of them to your report and you'll see which one the AI reads best, with the same checks and the same score.

You enter their domains at checkout, and we compare them as soon as your report opens.

Compare my site
Fig. 5 An example with made-up sites: the same analysis, run on yours and on two competitors. Yours comes last, and the report says why.

One payment. That's it.

Fix it once. No monthly bill.

Most AI visibility tools charge every month to keep an eye on whether ChatGPT mentions you. But what stops an AI from reading your site is technical: a page that only exists after JavaScript runs, a robots.txt that shuts the door, structured data that isn't there. Once it's fixed, it stays fixed. So we charge once.

Check my site free

AI visibility trackers

$29–$399+a month, every month

  • Track whether AI answers mention your brand
  • Keep billing while you watch the charts
  • Finding the technical cause is usually up to you

Tarsier

19 €$19once

  • Finds why AI can't read your site, point by point
  • The fix written for your site, plus a ready-to-paste prompt
  • A free second analysis within 30 days to prove it worked
  • Side-by-side comparison with two competitors
  • No account, no subscription, nothing to cancel
Fig. 6 Range taken from the public pricing pages of AI visibility trackers, September 2026.

See also the public ranking of sites analyzed against these same criteria. If yours scores well, it can appear there too.

The other way round

Rather AI didn't read your site at all?

Some sites want the opposite: no training on their work, no summaries, no answers built from their pages. We check which AI crawlers get in today, whether Google still does, and give you a plan to close the door without losing search.

Check who gets inOr just the robots.txt, free

Frequently asked questions

  1. Why is the report paid?

    Because every analysis opens a real browser on our server to see your site the way a person does, and runs it past eleven AI crawlers. That costs machine time on every run, the free ones included. The report is what pays for all of it, and what keeps the score and the comparison free for anyone.

  2. Isn't this just ordinary SEO?

    No. Google has rendered JavaScript for years; AI crawlers, by and large, don't. A site can do well on Google and be invisible to ChatGPT or Perplexity. That's what we measure.

  3. What do I get without paying?

    The score out of 100, both versions of your site side by side, the marked-up checklist of what passes and what doesn't, and the most serious problem we found. No sign-up, no card, no limit on how many sites you analyze. If your site already scores well we tell you so and sell you nothing.

  4. And what do I get if I pay?

    Mostly the prompt: a document of over three thousand words written for your site, which you paste into Claude, ChatGPT or Cursor so it does the work. With it come the written fix for every problem, the exact fragment that fails, speed measured with Google PageSpeed, a comparison against two competitors, downloads in PDF and Markdown, and a second free analysis of the same domain to confirm it's fixed.

  5. How long does it take and what do I need?

    Between 15 and 40 seconds, and just your address. No sign-up, no card, nothing to install: the result appears on the same page. We open your site twice, compare both versions, and score 36 checks across 6 areas.

  6. How long do you keep my report?

    72 hours if you don't pay, then it deletes itself. If you pay we keep it 90 days and it also arrives by email with the PDF and .md attached, so that copy is yours forever. We don't store your site or revisit it on our own.

  7. Can I check that it's actually fixed?

    Yes, without paying twice. The report comes with a second free analysis of the same domain for 30 days: you apply the changes, run it again, and see the new score next to the old one. It usually takes under 10 minutes of work if you use the prompt.

  8. Can you guarantee ChatGPT will cite me?

    No, and be wary of anyone who promises that. This removes the technical reasons it can't cite you today: letting the crawler in, getting your text into the HTML, making the page say who you are. Whether it then picks you over someone else depends on your content and your competition, and nobody can sell you that.

  9. Can I use it to keep AI out of my site instead?

    Yes, there's a check for exactly that: choose “I don't want AI to read my site” above the address box. It tells you which of the 14 AI crawlers get in, whether Google and Bing still do, and the plan to close the door without losing search. Blocking them all also takes you out of ChatGPT, Claude and Perplexity answers; if you only want to stay out of training, the recommended recipe of the robots.txt generator does that and keeps you in the answers.

Analyze my site free

Rather not touch the code?

Tell us about your site and we'll implement it for you: the report's changes applied to your code, with the analysis run again afterward so you can see the score before and after.

Get in touch

Tarsier