Roundup
The Best Free AI Visibility Tools in 2026
AI search is becoming a real traffic channel, and a wave of free tools now check whether ChatGPT, Claude, Perplexity, and Gemini can find and cite your site. We tried the main ones. Here is an honest, no-fluff comparison — including our own tool, LLCrawler.
Full disclosure: we build LLCrawler, the first tool below. We have tried to describe every tool fairly. If we got something wrong, email us and we will fix it.
Free AI visibility tools, side by side
| Tool | Free? | Signup | Best for |
|---|---|---|---|
| LLCrawler | 100% free | No | A free, bilingual (EN/ES) technical audit that generates ready-to-paste fixes — llms.txt, a JSON-LD kit, a badge, and an agent prompt — in about 30 seconds. |
| SiteTest.ai | Free core; paid tiers | No | A clean A–F grade with ready-to-paste code fixes; deeper developer briefs and re-audits sit behind paid tiers ($4.99–$24.99/mo). English only. |
| LLM Check | Free | No | A Chrome extension for one-click checks on any site as you browse, plus an AEO glossary. Strong structured-data focus. |
| Sona | Free | No | A fast 17-check audit that crawls up to 15 pages, runs a live GPTBot probe, and validates robots.txt and llms.txt. |
| Dexus Creative LLM Audit | Free | No | An instant audit across eight categories with prioritized recommendations, covering ChatGPT, Perplexity, Google AI Overviews, Claude, and Copilot. |
| Visus | Free | No | A no-card, under-a-minute score for a quick first read on where your site stands. |
How we picked
We included tools that are genuinely free to run a real audit (not just a paywalled teaser), focus on AI/LLM search visibility rather than only traditional SEO, and return something actionable. We left out paid-only monitoring platforms — those track brand mentions over time and are a different job.
Our take
If you want one free audit that also hands you the fixes — generated llms.txt, JSON-LD, a shareable badge, and a prompt to implement everything — start with LLCrawler, especially if you need Spanish. If you prefer a letter grade, try SiteTest.ai. If you want to spot-check sites from your browser, LLM Check's extension is handy. The good news: they are all free to try, so run two or three and compare.
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