Open-source Python library for SEO and SEM workflows, including crawling with Scrapy, robots.txt and sitemap parsing, SERP APIs, log file parsing and text analysis.
advertools.readthedocs.io
Page SpeedFreeFree tier
PageSpeed Insights
Google's free page performance tool combining Lighthouse lab diagnostics with field data from the Chrome UX Report, reporting Core Web Vitals for a URL or origin.
What it is
Google's free page performance tool combining Lighthouse lab diagnostics with field data from the Chrome UX Report, reporting Core Web Vitals for a URL or origin.
It sits in the page speed category, and also covers free utility. It is built by Google, based in United States, and has been around since 2013. A public API is available for pulling data into your own reporting.
Documentation & guides
- PageSpeed Insights · Tool Guide
The Atlas does not rank tools. No scores, no "top 10", no affiliate links. Categories are descriptive, and two tools in the same category may solve very different problems. Trial the shortlist against your own site before deciding.
Alternatives & neighbours
9 tools sharing at least one category with PageSpeed Insights.
Browser extension showing on-page SEO data, redirect chains and Ahrefs link and traffic metrics for pages and search results.
ahrefs.com
Chinese webmaster tool site providing composite SEO diagnostics, Baidu weight and keyword ranking analysis, backlink and reciprocal-link checks, keyword mining, dead-link detection and historical site data, plus a paid data API.
aizhan.com
Shopify app bundling on-page SEO fixes, structured data, image optimisation and speed improvements for merchants.
avada.io
Microsoft's free site owner console for Bing, providing search performance data, index and crawl diagnostics, URL submission, IndexNow support and keyword research.
bing.com
Korean keyword research tool for looking up search volume and analysing keyword demand, widely used for Naver and Google keyword work.
blackkiwi.net
Site speed monitoring service running scheduled Lighthouse tests, tracking Core Web Vitals and real user data with budgets and CI integration.
calibreapp.com
Chinese webmaster tool suite from Chinaz covering SEO overview queries, Baidu weight estimation, app and site ranking lookups, WHOIS, ICP filing checks, reciprocal-link verification and a data API.
chinaz.com
Free structured data viewer that renders a page's schema markup as an interactive graph for debugging entity relationships.
classyschema.org