Best LLM SEO Checking Tools in 2026: 9 Tools Compared

Frase scores drafts for both traditional SEO and generative engine optimization, with a free checker for quick AI visibility checks plus crawler logs, share of voice, buying stage analysis, and a weekly benchmark on paid plans. It also researches, drafts, scores, publishes to your CMS, and repairs Google decay, making it a full content workflow, not just a checker. Starter pricing is reported around 39 to 45 dollars a month billed annually.

GEO depth is below dedicated trackers like Profound, since Frase is primarily a content tool. But for teams that want one checker for both SEO and AI readiness at a budget price, Frase is the best choice.

Surfer's Content Editor scores a draft against ranking pages, checking structure, heading hierarchy, keyword coverage, and content length, with a free AI visibility audit available by email report. Its AI Tracker add-on, around 95 dollars a month, adds AI visibility monitoring to the same workflow. Entry plans start around 99 dollars a month billed annually, with a Discovery tier reported in euros at a lower price in some regions.

The AI Tracker is an extra cost, and the entry price is high for solo writers. But for content teams that already score drafts with Surfer, adding AI checks in the same editor is the most efficient route.

Clearscope grades drafts for semantic coverage using natural language processing, showing which related terms and topics a draft covers compared to top-ranking content, with clean reports that editorial teams trust. Essentials starts at 129 dollars a month, with Business at 399 dollars for larger teams, and a 14-day trial for testing.

It does not track AI citations, so it checks content quality, not AI visibility. But for editorial teams that want one clean grader before publishing, Clearscope is the best semantic checker here.

WordLift checks schema markup and entity relationships, validating whether structured data correctly describes your content for search engines and AI systems. That alignment matters for AI citation, since engines rely on structured data to understand entities, authors, and facts. Pricing starts around 59 euros a month, with a free trial for testing.

It focuses on schema, not full content scoring, so pair it with Frase or Surfer for semantic checks. But for schema alignment and structured data quality, WordLift is the best dedicated checker.

MarketMuse validates topical depth, showing whether a draft covers a topic deeply enough to be authoritative compared to competing content, and where authority gaps remain. That depth check matters for AI citation, since engines favor comprehensive, trustworthy sources. A free tier covers basic checks, with paid plans priced on request.

It does not track AI citations, and paid pricing requires a sales conversation. But for content planning and depth validation before publishing, MarketMuse is a strong, research-backed choice.

Otterly AI, best known as a tracker, also offers a GEO audit checking 25 plus on-page factors that affect AI citation, from structure and clarity to source quality. That audit, combined with built-in citation tracking, makes Otterly a useful pre-publish checker for teams already tracking with it. Lite starts at 29 dollars a month.

Audit depth is below dedicated graders like Clearscope, and core plans refresh weekly. But for the cheapest entry with a GEO-specific audit plus tracking, Otterly is hard to beat.

Perplexity is not a checker tool, but it is the most direct way to simulate citation: ask it the questions your audience asks, and see whether it cites your pages. That manual test reveals what AI engines actually do with your content, which no scoring tool can fully predict. Free covers basic use, with Pro at 20 dollars a month for more queries and models.

It is manual and unstructured, with results that vary by prompt wording. But as a reality check before publishing, running your key questions through Perplexity is a free, essential step.

Geotoolbox offers free AI Readiness and AI Crawler checks that show whether AI bots can reach, read, and parse your pages, which is the first gate for AI citation. If bots cannot crawl your content, no amount of semantic scoring matters. Its tracker starts at 99 dollars a month for ongoing monitoring.

The free audit is narrower than a full content grader, covering readiness rather than semantic depth. But as a free first check for AI crawlability, Geotoolbox is an essential starting point.

Screaming Frog is a technical SEO crawler that, on its licensed version at 279 dollars a year, can run LLM prompts across crawled pages to check AI readiness at scale. Its free version covers up to 500 URLs for basic crawling. That scale suits technical teams auditing hundreds of pages for crawlability, schema, and structure issues.

It is a technical tool, not a content grader, and it needs SEO knowledge to use well. But for technical AI-readiness audits across a whole site, Screaming Frog is the best scalable checker.