Free SEO Tools for Developers
11 free SEO audit tools: on-page checker, schema markup generator, Core Web Vitals tester, WCAG accessibility checker, robots.txt generator, and more. Run as slash commands in Claude Code, Cursor, and other AI coding assistants.
-- total installs
Install all tools with one command:
curl -fsSL https://suparank.io/install | bash Free SEO Audit Tool
Complete website SEO audit combining on-page analysis, technical SEO, Core Web Vitals, accessibility, and schema validation in one comprehensive report.
/suparank-full -- installs
On-Page SEO Checker
Free on-page SEO analysis tool with 25+ checks. Analyze title tags, meta descriptions, heading structure, keyword density, and internal links like Ahrefs and Semrush.
/suparank-onpage -- installs
Website Accessibility Checker
Free WCAG 2.2 accessibility checker for Level AA compliance. Test color contrast ratios, alt text, keyboard navigation, ARIA labels, and ADA compliance.
/suparank-a11y -- installs
LLMs.txt Generator
Generate llms.txt and llms-full.txt files for AI search optimization. Help ChatGPT, Claude, and Perplexity discover and understand your content.
/suparank-llms -- installs
Robots.txt Generator
Free robots.txt generator with AI crawler rules. Create optimized robots.txt files with sitemap references, GPTBot rules, and framework-specific settings.
/suparank-robots -- installs
Technical SEO Audit Tool
Free technical SEO audit covering crawlability, indexation, HTTPS security, redirect chains, canonical tags, and structured data validation.
/suparank-technical -- installs
Schema Markup Generator
Free JSON-LD schema generator and validator. Create Article, FAQ, HowTo, Product, and Organization structured data for Google rich results.
/suparank-schema -- installs
Core Web Vitals Checker
Test Core Web Vitals performance: LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift) with fix recommendations.
/suparank-cwv -- installs
Meta Tag Generator
Free meta tag generator for SEO. Create optimized title tags, meta descriptions, Open Graph tags, Twitter Cards, and canonical URLs with live preview.
/suparank-meta -- installs
Internal Link Checker
Free internal link checker and broken link detector. Analyze anchor text distribution, find orphan pages, check redirect chains, and audit external links.
/suparank-links -- installs
Image Alt Text Checker
Free alt text checker and image SEO audit tool. Validate alt attributes, check image file sizes, detect WebP/AVIF support, and verify lazy loading.
/suparank-images -- installs
How It Works
Install
Run the install script in your terminal. It automatically detects your AI coding assistant.
Use
Type the slash command in your AI assistant, like /suparank-onpage
Get Results
The AI analyzes your code or page and provides a detailed report with fix recommendations.
Frequently Asked Questions
What is the best free SEO audit tool?
Suparank offers a comprehensive free SEO audit tool that combines on-page analysis, technical SEO checks, Core Web Vitals testing, accessibility scanning, and schema validation. Unlike web-based tools, it runs directly in your AI coding assistant (Claude Code, Cursor) for instant feedback while you code.
How do I check my website's Core Web Vitals?
Use Suparank's Core Web Vitals Checker by running /suparank-cwv in your AI assistant. It analyzes LCP (Largest Contentful Paint), INP (Interaction to Next Paint), and CLS (Cumulative Layout Shift) metrics with specific fix recommendations for each issue.
How do I generate JSON-LD schema markup?
Run /suparank-schema in your AI assistant. The Schema Markup Generator creates valid JSON-LD structured data for Article, FAQ, HowTo, Product, Organization, and other schema.org types. It validates existing markup and suggests missing schemas for Google rich results.
What is a robots.txt generator?
A robots.txt generator creates the robots.txt file that tells search engine crawlers which pages to index. Suparank's generator (/suparank-robots) includes AI crawler rules for GPTBot and Google-Extended, sitemap references, and framework-specific settings for Next.js, Astro, and WordPress.
How do I check website accessibility for WCAG compliance?
Use Suparank's Website Accessibility Checker (/suparank-a11y) to test WCAG 2.2 Level AA compliance. It checks color contrast ratios (4.5:1 minimum), alt text on images, keyboard navigation, ARIA attributes, form labels, and focus management with detailed fix recommendations.
Are these SEO tools free to use?
Yes, all 11 Suparank SEO tools are completely free. Install with curl -fsSL https://suparank.io/install | bash. They work as slash commands in AI coding assistants including Claude Code, Cursor, OpenCode, Codex CLI, and Antigravity. No subscription or account required.
Install Free SEO Audit Tools
Get all 11 SEO tools instantly: on-page checker, schema generator, Core Web Vitals tester, accessibility checker, and more. One command, no account required.
curl -fsSL https://suparank.io/install | bash