Compare: MozBar vs Ahrefs SEO Toolbar

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Metric	MozBar	Ahrefs SEO Toolbar
User count	900,000	400,000
Average rating	3.32	4.36
Rating count	2,535	529
Last updated	2026-07-05	2026-04-22
Size	0.45 MB	1.06 MB
Version	5.0.16	3.2.9

Short description	MozBar V4 offers SEO tools like Domain Authority, Page Authority, Spam Score, keyword analysis, link metrics, and page optimization insights.	Ahrefs SEO Toolbar brings on-page data, keyword ideas, and link analysis to your browser. Core tools free; Ahrefs metrics require a subscription.
Full summary	MozBar V4 is the ultimate SEO toolbar by Moz designed for on-the-go SEO research and analysis. It features Domain Authority and Page Authority metrics available to Community users, while Moz Pro users gain access to advanced metrics including Spam Score and exclusive Brand Authority. The extension highlights keywords on any page and classifies links by type, offers rebuilt page analysis with hreflang, robots.txt, sitemap URL detection, and schema markup identification. The extension also allows users to tap into Moz Pro keyword queries for insights into a website's top-ranking keywords, compare link metrics directly on SERPs, and export SERP data to CSV files. Recent updates have improved usability by fixing CSS conflicts, restoring key login and display functions, introducing a SERP Overlay beta, and refining the user interface for settings and features. MozBar V4 supports flexible usage with dark mode and enhanced navigation, making it a powerful tool for SEO professionals and marketers seeking detailed page optimization insights.	Ahrefs SEO Toolbar is a free browser extension that brings comprehensive SEO data directly to your browsing session. It enables global SEO research with region, Google domain, and language switching, and suggests new keyword ideas right in search results. In one click you get on-page SEO data (titles, meta descriptions, headers, canonical tags, indexation directives), easy link analysis (highlighting links, tracing redirects, filtering outgoing links, spotting broken links, exporting CSV), and additional tools (HTTP headers, user-agent switching, performance data). Paid Ahrefs users can view domain and page metrics directly on sites and results, while core tools remain free; a subscription is required for Ahrefs metrics.