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 ExtensionFreemiumFree tier
MozBar
Moz browser extension overlaying Domain Authority, Page Authority and link metrics onto search results and web pages.
What it is
Moz browser extension overlaying Domain Authority, Page Authority and link metrics onto search results and web pages.
It sits in the browser extension category, and also covers free utility. It is built by Moz (Ziff Davis), based in United States, and has been around since 2010.
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 MozBar.
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