A curated list of SEO tools!
Legend: 🔓 open source · 🆓 free · 💵 freemium (free + paid plans) · 💰 paid
- AnswerLens - Audits pages for AI answer-engine visibility. 💵
- Broken Link Checker - Chrome extension to find broken links on a page or across a whole site. 💵
- CrakSEO Search Console MCP - Free MCP server exposing Google Search Console and Bing Webmaster data to AI agents. 🆓
- crawler-snapshot - Open-source CLI that renders JavaScript SPAs and compares raw vs rendered HTML. 🔓
- DeepSpider - 12 free technical SEO tools (robots.txt, sitemap, indexability, canonical, hreflang). 🆓
- GSC Connector - Open-source MCP server bridging Claude and Google Search Console. 🔓
- gsc-hub - Open-source self-hosted Search Console dashboard with striking-distance and cannibalization reports. 🔓
- gsc-index-triage - Open-source agent skill for Google Search Console indexing triage. 🔓
- GSC Indexer - CLI and GitHub Action to submit and re-index URLs via the Google Search Console API. 🔓
- IMVASA SEO Audit - Free 210-check SEO audit covering technical, on-page, Core Web Vitals and AI readiness. 🆓
- KinetixSEO - On-page and GEO SEO checker that ranks findings by impact vs. effort. 💵
- LinkBunny - Free indexability and nofollow link checkers. 🆓
- Local Site Audit - Open-source browser extension that audits sites for technical defects. 🔓
- Manifold MCP - Free MCP server exposing 15+ SEO tools (rankings, backlinks, keywords, GSC) to AI agents. 🆓
- MergeFix - AI agent that audits a site and ships SEO, accessibility and performance fixes as Pull Requests. 💰
- Mydentify - Free technical-SEO tools for sitemap health, crawler access and more. 🆓
- NoindexWatch - Free noindex, robots.txt and AI-bot access checkers. 🆓
- OptimalUX - Real-time SEO patching and A/B testing for flawless web experiments. 💵
- PasteZap Sitemap Validator - Free XML sitemap validator. 🆓
- pSEOlint - Programmatic-SEO auditor with SpamBrain and AEO checks. 💵
- Quietwatch Noindex Checker - Free noindex checker inspecting meta, headers, redirects and X-Robots-Tag. 🆓
- RankGuru - Free on-page SEO checker with competitor comparison. 🆓
- RankProof - Open-source SERP visibility and backlink auditor using Bing, DuckDuckGo and Mojeek. 🔓
- Raven Tools - SEO software focused on site audits and rank tracking. 💰
- Screaming Frog SEO Spider - Industry-leading website crawler for technical SEO audits. 💵
- Screpy - AI-assisted SEO audits, crawling, rank tracking and monitoring. 💵
- Seobility - All-in-one SEO software including crawler, rank tracker, backlink checker, and reporting tools. 💵
- seo-agent - Open-source Python agent that runs on-page SEO audits. 🔓
- SEO Audit Toolkit - Open-source Python sitemap crawler and Search Console overlap finder. 🔓
- SEO Command Center - Self-hosted SEO platform built on the DataForSEO API. 🔓
- SEOMathLab - 67+ free SEO calculators (traffic forecast, ROI, budget, content planning). 🆓
- SEOPeek - Lightweight SEO audit API with 20 checks. 💵
- Sempite - Free site audit covering crawlability, on-page, speed, structured data and AI readiness. 🆓
- Shipwork - Inspect your site the way Google and AI crawlers see it, with 83 free checks. 💵
- squirrelscan - Website QA/audit CLI for coding agents, with 295+ rules and exact fixes. 🔓
- Superflow - AI QA review agents for websites, with free SEO and meta utilities. 💵
- Toadstone - Open-source self-hosted SEO crawler with 220+ checks, JS rendering and MCP. 🔓
- Ubersuggest - Free SEO tool specializing in generating keyword ideas. 💵
- vercel-seo-audit - CLI SEO audit for Next.js projects. 🔓
- WebsiteReady - Free pre-launch website checklist with AI-readiness checks. 🆓
- Woorank - Tests your website according to more than 70 SEO criteria. 💵
- AEO Toolkit - Open-source 44-check SEO/AEO audit suite with Chrome extension and npm packages. 🔓
- aeo-check - Open-source checker for AI crawler readability across ChatGPT, Claude and Perplexity. 🔓
- AEOrank - Deterministic Answer Engine Optimization scoring via CLI. 🔓
- ai-crawler-bots - CLI and GitHub Action that audit AI-crawler access. 🔓
- BotView - Free AI crawler access checker and AI-answer recommendation tool. 🆓
- ChatGPT Citation Checker - Python script that checks whether ChatGPT names your company. 🔓
- citable - CLI that audits AI search visibility and SEO. 🔓
- Cited By AI - Block-level AI citation auditing across a 28-module rubric. 💵
- Click Coded AI Visibility Check - Free AI-crawler visibility checker with generated fix files. 🆓
- Foglift - SEO and GEO analyzer with monitoring, API, CLI and MCP. 💵
- geo-audit - Open-source single-file GEO auditor (AI crawler access, schema, E-E-A-T). 🔓
- geolint - "ESLint for AI search": audits AI-crawler access, llms.txt, schema and citability. 🔓
- GEO Optimizer - Open-source GEO toolkit that audits AI-crawler readiness. 🔓
- GEO/AEO Tracker - Open-source dashboard that tracks AI search visibility. 🔓
- HitMind robots.txt Generator - Free robots.txt generator with AI-crawler rules for GPTBot, Claude and Perplexity. 🆓
- IndexFox - AI search visibility widget and monitoring for your brand. 💰
- LLM Pulse - Track brand visibility across ChatGPT, Perplexity and Gemini answers. 💵
- LovedByAI - WordPress plugin that makes pages citable by AI search engines. 💰
- mesure-citations - Manual, privacy-first CLI to measure citation share in AI answers (FR). 🔓
- NotFair - Open-source Claude Code skills for SEO, GEO and paid ads. 🔓
- Orkkid AI Citation Checker - Free tool that tests ChatGPT and Perplexity citations in real time. 🆓
- PageLens AI Crawler Checker - Free checker for GPTBot, ClaudeBot and PerplexityBot access. 🆓
- PromptEden - Monitor brand mentions across ChatGPT, Claude and Gemini. 💵
- RankAgent - Free AI crawler checker, llms.txt generator and schema generator. 🆓
- readable-by-ai - Open-source checker for AI crawler access, JS-only content and schema. 🔓
- SEO for AI - Audit and improve how AI search engines read and cite your site. 💵
- SGEO - SEO/GEO automation platform with schema injection and AI agents. 💵
- Skald Analytics - Open-source AI-traffic analytics from server logs (crawlers, AI reads, referrals). 🔓
- toprank - Open-source marketing and SEO skills for AI coding agents. 🔓
- WordPress GEO Optimizer - WordPress plugin that adds GEO and structured-data signals. 🔓
- AccessScore - Accessibility checker that flags WCAG issues with SEO impact. 💵
- Alt Audit - AI alt-text and WCAG compliance tool for WordPress. 💵
- axe DevTools - Accessibility testing tools by Deque. 💵
- PageGuard - Website health scanner for accessibility, SEO and performance. 💵
- RatedWithAI - Accessibility scanner powered by axe-core. 💵
- TrustYourWebsite - EU compliance scanner for cookies, privacy, accessibility and security. 💰
- WAVE - Web accessibility evaluation tool by WebAIM. 🆓
- Web Accessibility Checker - WCAG and EAA accessibility scanner. 💵
- AltoRank - Content-focused SEO platform (keyword research to drafts to publishing) with an open-source self-hosted option. 🔓
- Buzzsumo - Analyze which content performs best for any to 8623 pic or competition. 💵
- ContentStudio - Discover niche-relevant content and share it on your social media channels. 💵
- SearchAttention - Optimize your content for AI Search Engines like Google AI Overview, Perplexity or SearchGPT. 💵
- SimilarWeb - Discover your world rank and get information about traffic and referrals. 💵
- SocialBu - Social media management and scheduling with automation. 💵
- The SEO Autopilot - Programmatic SEO playbook and automation system. 💵
- Applinks Documentation - Use meta tags to create deep links for your apps. 🆓
- Awesome Open-Source SEO - Curated list of open-source SEO tools. 🔓
- Diretrizes para Webmasters - Google guidelines for webmasters. 🆓
- Open Graph Protocol - Meta tags protocol used by Facebook. 🆓
- AHrefs - Backlinks searcher and SEO reporter. 💰
- backlink-guard - Open-source tool that vets backlink quality and detects spam patterns. 🔓
- CallAI Tools - 100+ free client-side webmaster and SEO tools. 🆓
- CrawlGraph - Backlink analysis and competitor research. 💵
- DR Checker - Check Ahrefs Domain Rating for any domain, free. 🆓
- Keywordtool.io - Keyword search tool for Google, YouTube, App Store, and Bing. 💵
- looot-seo - Open-source self-hosted SEO workspace (rank tracking, SERP snapshots, backlinks). 🔓
- new-term-radar - Open-source tracker for emerging keywords mined from X, GitHub and Hugging Face. 🔓
- Open Link Profiler - Discover who is creating backlinks to your site. 🆓
- SemRush - Comprehensive tool for analyzing website keywords. 💵
- SERP to Prompt Writer - Open-source desktop app that scrapes SERPs and generates AI writing prompts. 🔓
- SiteData - Reverse-AdSense and ad-intelligence research. 💰
- ZensInk - Free CLI toolkit for keyword research and technical audits. 🔓
- Google Mobile Friendly Test - Test your site’s mobile compatibility according to Google. 🆓
- Google PageSpeed Insights - Test your website's performance and get optimization tips. 🆓
- GTMetrix - Measure your site’s Page Load Time, Total Page Size, and Total Requests. 💵
- Loader.io - Cloud-based load testing. 💵
- WebPageTest - Test your website’s performance and loading speed. 🆓
- Aarunya Schema Generator - JSON-LD schema generator. 💵
- BrainFeed Schema Generators - Free JSON-LD generators with rich-result eligibility guidance. 🆓
- CohesionStack Link Preview - Free Open Graph and social card preview checker. 🆓
- FAQ Schema Generator - Instantly generate FAQ structured data to improve your click-through rate. 🆓
- Formgong Review Schema Generator - Free JSON-LD review schema generator. 🆓
- GeoImageTagger - AI photo geotagging and EXIF metadata for local SEO. 💵
- Google Rich Results Test - Test your microdata markup and see examples. 🆓
- JSON-LD Schema Markup Generator - A utility to build schema markup using JSON-LD. 🆓
- nextjs-jsonld-schema - Next.js library for JSON-LD structured data. 🔓
- ogimg.xyz - Open Graph image generation API. 💵
- OmniSEO Tools - 45 free client-side SEO, meta and schema utilities. 🆓
- Open Graph Debugger - Debug Open Graph metadata. 🆓
- Open Graph Image Preview - Open Graph image preview and debugger. 🆓
- Oxwyn Schema Generator - Client-side LocalBusiness JSON-LD generator. 🆓
- Schema.org Full List Documentation - Full list of schema.org recipes for implementing structured data. 🆓
- SchemaForge - Validated JSON-LD schema generator. 💵
- SERP Preview - Open-source SERP snippet preview tool. 🔓
- ShareScan - Free Open Graph / link preview scanner with public reports. 🆓
- Social Card Checker - Free Open Graph social card preview. 🆓
- Uttily JSON-LD Generator - Free browser-based JSON-LD schema generator. 🆓
- 🇧🇷 eBook O Guia Completo de SEO em 2015 e Além - Ebook about SEO written in Portuguese.
- �🇧 AI Crawler Statistics 2026 - Research on how many sites block GPTBot, ClaudeBot and CCBot.
- 🇬🇧 Faster Sites: Beyond PageSpeed Insights - How to make your website load faster.
- 🇬🇧 SEO Knowledge Base (XKnow) - A cross-linked, agent-queryable SEO knowledge base (paid).
- 🇬🇧 How Online Reviews Impact Local SEO - Explore how reviews affect local SEO.
- 🇬🇧 How to Rank in 2018: The SEO Checklist - SEO checklist for ranking in Google.
- 🇬🇧 How to Write Great Schema Markup for Your Company - SEMrush guide on writing effective schema markup.
- 🇬🇧 Mastering SEO for Developers - How developers can optimize websites for SEO.
- 🇬🇧 The Definitive Guide to SEO for this year - Comprehensive SEO guide for 2024.