Here's something most business owners don't think about: right now, someone is asking ChatGPT, Perplexity, or Gemini a question that's directly relevant to what you sell. The AI either mentions your brand in the answer, or it doesn't. And you have no idea which one it is.
The good news? You don't need to spend a cent to find out. Mentionable offers five free AI visibility tools that give you real data in minutes. No signup, no credit card, no "book a demo" form. Just answers.
Here's what each tool does and how to use them.
1. AI Visibility Check: Does AI even know you exist?
This is where everyone should start. The AI Visibility Check answers the most basic question: when someone asks an AI about your category, does your brand come up?
Enter your URL and a prompt that your ideal customer might ask (something like "best project management tools for freelancers" or "top organic skincare brands"). The tool queries ChatGPT, Claude, Perplexity, Gemini, and Grok with that exact prompt, then analyzes each response to see if you're mentioned.
Results come back in about 60 seconds. You'll see a clear breakdown per LLM: mentioned or not, the sentiment if you are mentioned, and which competitors showed up instead.
What makes this useful isn't just the binary "yes/no." It's the competitive context. If ChatGPT recommends three competitors but not you, that's a specific gap you can work on. If Perplexity mentions you but Claude doesn't, that tells you something about how different AI models perceive your brand.
One check won't give you the full picture, but it gives you enough to know whether AI visibility deserves your attention. For most people, the answer is a very clear yes.
2. GEO Audit: Is your site ready for AI crawlers?
Being visible to AI isn't just about having great content. It's also about whether AI can actually access and understand your site. The GEO Audit checks both sides.
Enter any page URL and the tool evaluates four key areas:
Bot access. Can AI crawlers reach your content? Some sites inadvertently block AI bots through robots.txt rules, meta tags, or server configurations. If Googlebot-Extended or ChatGPT-User can't access your pages, you're invisible by default. The audit checks your robots.txt, identifies which AI bots are blocked, and flags any issues.
Schema markup. Structured data helps AI understand what your page is about. The audit checks for relevant schema types (Article, Product, FAQ, Organization) and validates that they're properly implemented. Missing or malformed schema means AI has to guess what your content represents.
Content quality. The audit evaluates whether your content is structured in a way that AI can parse effectively. Clear headings, logical organization, named entities, statistics with sources. These are the signals that help AI extract reliable information from your pages.
Overall AI readiness. A composite score that combines all factors into a single readability metric. You get specific recommendations for what to fix, ranked by impact.
The most common issue we see? Sites that block AI bots without realizing it. A single line in robots.txt can make your entire site invisible to ChatGPT or Claude. The GEO Audit catches that in seconds.
3. llms.txt Generator: Tell AI what your site is about
The llms.txt standard is relatively new, but it's gaining traction. Think of it as a robots.txt for AI: a plain text file at the root of your site that helps large language models understand who you are, what you do, and which pages matter most.
The llms.txt Generator scans your site and creates this file automatically. It identifies your key pages, extracts your business context, and formats everything according to the llms.txt specification.
Why does this matter? AI models crawl the web to build their understanding of brands and topics. An llms.txt file gives them a clear, structured summary instead of making them piece it together from scattered pages. It's like handing someone a business card instead of making them search through your entire website.
The generator outputs a ready-to-use file. Download it, place it at yoursite.com/llms.txt, and you're done. It takes less than five minutes and removes one more barrier between your brand and AI comprehension.
Is it a magic bullet? No. But it's a simple, zero-risk improvement that costs nothing. And as more AI systems start looking for llms.txt files, having one in place early gives you a head start.
4. Product Page Audit: E-commerce specific checks
If you sell products online, generic SEO audits miss the details that matter for AI visibility. The Product Page Audit is built specifically for e-commerce pages.
It validates the structured data that AI relies on when recommending products:
Product schema. Is your product properly marked up with name, description, brand, images, and identifiers (GTIN, SKU, MPN)? AI models use Product schema to understand what you're selling and when to recommend it.
Offers and pricing. Price, currency, availability, shipping details. If your Offer schema is incomplete or outdated, AI might skip your product even when it's exactly what someone is looking for.
Ratings and reviews. AggregateRating and individual Review markup. Products with visible social proof get recommended more frequently by AI. If you have reviews but no schema for them, AI can't see them.
SEO and GEO factors. Meta information, image optimization, content structure. All the basics, but evaluated specifically through the lens of how AI parses product pages.
The audit gives you a checklist of what's working and what needs fixing. Most product pages we analyze are missing at least two or three schema elements that would improve their AI visibility. These are usually quick fixes that your developer can implement in an afternoon.
5. Content Opportunity Finder: What should you write about?
You know you need content. But which topics will actually move the needle for AI visibility? The Content Opportunity Finder takes the guesswork out of that decision.
Enter your URL and the tool analyzes your niche to find the prompts and topics where AI currently discusses your category but doesn't mention you. These are your content gaps: specific opportunities where creating the right content could get you into AI recommendations.
For each opportunity, you see the topic, why it matters, and what kind of content would help fill the gap. Instead of writing blog posts and hoping for the best, you're targeting the exact areas where AI visibility is up for grabs.
This is especially useful if you're a solopreneur with limited time. You can't write about everything, so knowing which topics have the highest impact helps you prioritize. One well-targeted article that gets you into AI recommendations is worth more than ten generic blog posts that don't.
How to use these tools together
Each tool is useful on its own, but they're more powerful as a workflow. Here's the order that makes the most sense:
Step 1: Check your visibility. Start with the AI Visibility Check. Pick 2-3 prompts that your customers would realistically ask and see where you stand. This gives you a baseline.
Step 2: Audit your site. Run the GEO Audit on your most important pages (homepage, main product or service page, top blog post). Fix any bot access issues first, because everything else is pointless if AI can't reach your content.
Step 3: Add llms.txt. Generate your llms.txt file and deploy it. Quick win, minimal effort.
Step 4: Check product pages. If you're in e-commerce, audit your top product pages with the Product Page Audit. Fix missing schema and review markup.
Step 5: Find content gaps. Use the Content Opportunity Finder to identify where you should focus your content efforts. Create content for the highest-impact opportunities first.
Step 6: Re-check visibility. After implementing fixes and publishing new content, run the AI Visibility Check again with the same prompts. Compare results. See what changed.
This entire workflow takes about an hour. And it gives you a clearer picture of your AI visibility than most people get with paid tools they never fully use.
When free tools aren't enough
Free tools give you snapshots. They're perfect for understanding where you stand right now, identifying problems, and making quick improvements.
But they don't track changes over time. They don't alert you when a competitor takes your spot in AI recommendations. They don't automatically generate the 15-20 prompts most relevant to your business and monitor them across all five LLMs twice a week.
That's what Mentionable's paid plans are for. If you run these free tools and realize AI visibility matters for your business (and for most businesses, it does), the natural next step is continuous tracking.
The Starter plan at 29 euros per month tracks 15 prompts across ChatGPT, Claude, Perplexity, Gemini, and Grok with automated monitoring twice a week. It includes competitor analysis, traffic analytics, and email alerts when things change. You can start with a 7-day free trial on any plan.
But here's the honest take: if you're just starting to think about AI visibility, the free tools are more than enough. Use them, fix what they surface, and upgrade when you're ready for ongoing monitoring. No rush.
