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
Browser ExtensionFreeFree tier
SEO Pro Extension
Free Chrome extension displaying on-page SEO elements, structured data, hreflang and Search Console data for the current page.
What it is
Free Chrome extension displaying on-page SEO elements, structured data, hreflang and Search Console data for the current page.
It sits in the browser extension category, and also covers free utility. It is built by SEO Pro Extension, and has been around since 2019.
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 SEO Pro Extension.
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
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
Technology lookup service and extension reporting the software, hosting, analytics and advertising stack used by a website, with lead list exports.
builtwith.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
Free, privacy-preserving analytics from Cloudflare that reports page views, referrers and Core Web Vitals without using client-side state.
cloudflare.com