SEO Tools
Tools for SEO auditing, structured data validation, performance testing, and keyword/backlink research.
- Google Search Console
- Google PageSpeed
- Rich Results Test — validate structured data eligibility for Google rich results
- Schema Markup Validator — generic schema.org validation
Browser Extensions
Section titled “Browser Extensions”Online Tools
Section titled “Online Tools”- SEO Site Tools
- OpenScreen - open graph image generator
Competitor & keyword research
Section titled “Competitor & keyword research”- OpenSEO — open-source (MIT) alternative to Semrush/Ahrefs for keyword research, backlink analysis, rank tracking, competitor insights, and AI visibility; self-hostable via Docker or Cloudflare, or use the managed version at app.openseo.so; requires bringing your own DataForSEO API key
Performance testing
Section titled “Performance testing”- Lighthouse — Google’s open-source page audit (performance, a11y, SEO, PWA); run via
npx lighthouse <url> --view - sitespeed.io — open-source suite for measuring web performance and Core Web Vitals; runs in Docker or via npm, integrates with Grafana/Graphite/InfluxDB for continuous monitoring; includes Browsertime (browser automation and timing), Coach (recommendations), and PageXray (page composition analysis)
- WebPageTest — detailed performance tests from real browsers across global locations; waterfall, filmstrip, and Core Web Vitals
- GTmetrix — performance reports combining Lighthouse scores with waterfall and historical tracking