# Lexicon SEO

> Words matter.

Lexicon SEO checks public pages for technical problems that keep them out of search results and AI answers, then says what to fix first, in plain English. Findings are evidence and heuristics. They are not a ranking or traffic estimate.

## Free tools

- [Free SEO tools](https://lexiconseo.com/tools/): Meta tag checker, robots.txt and sitemap validator, schema validator, Core Web Vitals, and a three-index eligibility check. Core Web Vitals include Google's lab and field numbers when Google returns them. The three-index check does not show whether the page is actually indexed, except for a Brave site: presence line when a Brave Search API key is set.
- [Meta tag checker](https://lexiconseo.com/tools/meta-tag-checker/): Title, meta description, Open Graph tags, robots meta, and viewport on one public page, with the same length notes as a full audit.
- [Robots.txt and sitemap validator](https://lexiconseo.com/tools/robots-sitemap-validator/): Whether robots.txt and its sitemaps can be fetched, whether the file disallows the whole site, which sitemap addresses are listed, and whether those files are usable XML.
- [Schema validator](https://lexiconseo.com/tools/schema-validator/): JSON-LD on one public page: whether a script is present, whether it is valid JSON, and whether each node has an @type. It does not promise a rich result.
- [Core Web Vitals check](https://lexiconseo.com/tools/core-web-vitals-check/): Lab Largest Contentful Paint and Cumulative Layout Shift from Google, and field 75th percentile LCP, INP, and CLS for the URL or its origin. HTML download time, size, image dimensions, and blocking scripts are listed too. No field data and quota limits are stated. It does not estimate traffic.
- [Three-index check](https://lexiconseo.com/tools/three-index-check/): Crawl and index eligibility for Google, Bing, and Brave from the page, robots.txt, and sitemaps that file lists. It does not call Google or Bing or show whether the page is actually indexed. When a Brave Search API key is set, the result adds a site: presence check. IndexNow is not used for Brave. To confirm Google or Bing indexing, connect Search Console or Bing Webmaster Tools in Lexicon.

## Pages

- [Home](https://lexiconseo.com/)
- [Pricing](https://lexiconseo.com/pricing/)
- [Free audit](https://lexiconseo.com/free/)
- [MCP setup](https://lexiconseo.com/docs/mcp/): How a Starter, Professional, or Business account connects Claude Code, Cursor, or Claude Desktop. The server is https://lexiconseo.com/mcp and uses an API key from the dashboard.
- [Contact](https://lexiconseo.com/contact/)
- [About](https://lexiconseo.com/about/): Lexicon SEO is a technical SEO and AI-visibility audit product from Lexicon Technologies LLC in Florida.

## Alternatives

These pages name public prices and what Lexicon SEO does not do. They are not a ranking of traffic or search results.

- [Semrush alternative](https://lexiconseo.com/semrush-alternative/): Six options, including Lexicon SEO, ordered by price, seat limits, and whether anyone turns the data into a fix list. Semrush still wins on keyword database depth and backlink index.
- [Ahrefs alternative](https://lexiconseo.com/ahrefs-alternative/): Six options, including Lexicon SEO, in the same order of reasons. Ahrefs still wins on backlink index depth.
- [Semrush pricing](https://lexiconseo.com/semrush-pricing/): Public Semrush seat prices, what the seat does not include, and the Lexicon SEO plan nearest that monthly price.
- [Ahrefs pricing](https://lexiconseo.com/ahrefs-pricing/): Public Ahrefs seat prices, what the seat does not include, and the Lexicon SEO plan nearest that monthly price.