Free SEO tools
Each of these checks one site or answers one question, straight away, with no account and no credits. Most read public pages and registry records, or run in your browser. The keyword generator, AI visibility checker, website traffic checker and backlink checker look up live data, so they have a daily limit per visitor.
They are the single-page versions of work IndexZero does across a whole site. When one page is not enough, an agent connected to IndexZero can run the same checks on every page and track the fixes.
- robots.txt tester and AI crawler checkerFetch a site's robots.txt, check it for errors, and see whether Googlebot, GPTBot, ClaudeBot, PerplexityBot and other crawlers may fetch a given path.Open tool →
- SEO checkerRun the on-page checks from IndexZero's site audit against one URL: titles, meta descriptions, headings, canonicals, indexability, redirects and response time.Open tool →
- Meta tag checker and SERP previewRead a page's title, meta description, canonical, Open Graph and Twitter tags, and preview how the page may appear in Google results and link shares.Open tool →
- SERP simulatorType a title and meta description and see roughly how they look as a Google result, measured in pixels, with the cut shown as you type.Open tool →
- Schema markup validatorExtract the JSON-LD structured data from a URL or pasted code, catch syntax errors, and check each type against the properties Google documents for rich results.Open tool →
- Domain age checkerLook up when a domain was registered, how old it is, when it expires, its registrar and its status, from the registry's own RDAP record.Open tool →
- Keyword generatorEnter a topic and a country to get keyword ideas built around it, with monthly search volume, keyword difficulty, CPC and search intent for each.Open tool →
- AI visibility checkerEnter a brand to see how often ChatGPT and Google's AI Overviews mention it, which sites those answers cite, and, with a category, its share of the brands they name.Open tool →
- Website traffic checkerEstimate any site's monthly organic Google traffic, see the keywords and pages that bring it, and compare two sites side by side.Open tool →
- Backlink checkerCount the backlinks and referring domains pointing at a site or a single page, and see the strongest sites that link to it.Open tool →
- SEO tool cost calculatorCompare the monthly cost of Ahrefs, Semrush and IndexZero for your number of sites and teammates, and whether you need AI visibility or agent access.Open tool →