Free GEO Tools: What Each Kind Actually Checks

Most free GEO tools do one of three jobs. Knowing which one you're looking at tells you how much weight to give the result.

The first kind tests gates. The second observes outcomes. The third claims to change outcomes. For a wider look at how paid and free products split along the same lines, see how to judge GEO tools.

The July 2026 critical survey of 45 GEO studies (arXiv 2607.14035) concluded that already-retrieved content can change how it is cited, but "no reviewed technique shows a stable, longitudinal, cross-platform causal effect on organic discoverability." Our digest of that survey walks through the details.

The problem is where the experiments ran. Nearly every published GEO effect was measured on documents already placed inside the model's context, with no live search. C-SEO Bench (NeurIPS 2025) found most conversational SEO methods "largely ineffective" and often harmful to ranking. Ahrefs' matched-control study found AI Overview citations fell 4.6% after pages added schema. Google's own guidance says you don't need to write in a special way for generative AI search.

Access is different. OpenAI documents that sites opted out of OAI-SearchBot will not be shown in ChatGPT search answers. Vercel's crawler study found ChatGPT and Claude crawlers fetch JavaScript files but don't execute them. These are mechanisms the operators state, and you can test them. That's why a free tool that checks access deserves more trust than one that rewrites your homepage. The full comparison sits in rewrites vs access fixes.

You need a terminal, a browser and access to your webmaster accounts. Replace example.com with your domain.

1. Read robots.txt per bot. Run curl -s https://example.com/robots.txt. Look for rules naming OAI-SearchBot, PerplexityBot, Claude-SearchBot and Googlebot, plus any User-agent: * block. Remember GPTBot controls training only. OpenAI states each setting is independent.
2. Request a page as a crawler. Run curl -s -o /dev/null -w "%{http_code}" -A "OAI-SearchBot" https://example.com/pricing. Repeat with PerplexityBot and ClaudeBot. A 200 is good. A 403, 429 or a challenge page means your firewall or CDN may be turning bots away.
3. Check what exists before JavaScript runs. Open view-source:https://example.com/pricing in your browser. Search for your price, product name and key claims. If they only appear in the rendered page, most AI crawlers can't read them.
4. Look for suppression tags. Search the source for noindex, nosnippet, max-snippet:0 and data-nosnippet. Templates often carry these by accident.
5. Check index status engine by engine. Use URL Inspection in Google Search Console and the URL check in Bing Webmaster Tools. One healthy index tells you nothing about the other.

Treat each finding as a gate: open or closed. There's no partial credit.

• robots.txt blocks a search bot. That engine's search can't use the page. Decide whether that was deliberate. A blanket AI block often removes ChatGPT search eligibility by mistake.
• robots.txt allows, curl returns 403. Your firewall overrides your robots.txt. Ask whoever runs your CDN to allow verified AI search crawlers.
• Key facts missing from view-source. Move prices, definitions and product names into the server-rendered HTML. This doesn't affect Google, which renders JavaScript.
• A stray nosnippet tag. Remove it from content you want shown in AI answers.
• All gates open. You're eligible. That's the ceiling of what access work can promise. Whether an engine picks your page is up to the engine.

Once access is clean, the next question is whether engines describe you correctly. The free GEO audit guide covers that order: access first, then accuracy.

Some limits apply to every tool, free or paid.

• A curl test isn't the real crawler. Firewalls often verify bots by IP address. Your laptop sending a bot user agent may be treated differently from the genuine crawler.
• Snapshots are samples. As of October 2026, ChatGPT decides per query whether to search, and Claude.ai search is a user toggle. One answer can come from live retrieval or from training data. Our note on what changes between checks explains why results drift.
• No rank exists. Google's Search Console reports AI impressions only, with no position. Any tool showing your "AI rank" in Google has nothing to check it against.
• Lab results don't transfer cleanly. See lab GEO studies vs live engines before trusting any uplift figure.

No tool controls what a model says. Free tools can show you blocks to fix.

If you'd rather not run curl by hand, the free checker on this site asks up to three buyer questions and shows whether AI engines name you. It's a snapshot, not continuous tracking, so pair it with the access steps above.

For a page-by-page review, the AI Content Checklist puts the checks in one list you can work through. Run it on your pricing, product and about pages first, since those hold the facts engines most often quote. When you outgrow free tools, compare options with which GEO tools are worth paying for.