40 free SEO tools

Yes. Every tool on this page runs without an account, a credit card, or a trial timer. Most compute entirely in your browser; the handful that need live data — authority, traffic, Core Web Vitals, domain age, keyword suggestions — call free public sources such as the Chrome UX Report, RDAP, and Google Autocomplete. They exist because people who find them useful sometimes go on to use Auto SEO.

No. There is no signup, no email gate, and no usage cap on the client-side tools. The tools backed by an API are rate-limited per IP to keep them available for everyone, which in practice means a short pause only if you run dozens of checks in a minute.

Run the SEO Score Checker on your most important page for a 22-point on-page audit, then the Googlebot Checker to review robots policy for the page. If nothing is broken technically, move to the keyword tools — a page that will not rank is more often mistargeted than technically broken.

The generators and analysers that work on pasted text — keyword density, readability, headline scoring, bulk meta checking, schema generation — run entirely in your browser and send nothing anywhere. The tools that check a live URL necessarily fetch that URL server-side, and the page content is not stored.

Each tool names its source on its own page. Where a number is a measurement — Core Web Vitals field data, registration dates, Chrome popularity tiers — it comes straight from the public dataset that produced it. Where a number is an estimate, such as keyword difficulty or SERP pixel widths, we label it as one and publish the formula instead of presenting a model output as a fact.

Several are built for it. The AI Visibility Checker, AI-Answer Readiness Checker, Agent Ready Score, and llms.txt Generator review robots policies, page structure or discovery documents; these checks do not establish actual crawler access or citations, and the Googlebot Checker evaluates GPTBot, ClaudeBot, and PerplexityBot alongside the search crawlers.