Ahrefs SEO Toolbar
The Ahrefs SEO Toolbar gives free on-page SEO data, link analysis and a redirect tracer in Chrome. Ahrefs metrics such as traffic need a subscription.
Freemium
- Windows
- macOS
- Linux
Tag
seo
6 programs
Software
MozBar
MozBar shows Domain Authority, Page Authority and on-page SEO details in Chrome. What Guest mode, a free Moz account and Moz Pro each unlock.
Freemium
- Windows
- macOS
- Linux
SEOquake
SEOquake adds an SEO toolbar, SERP overlay, page audit and keyword density report to Chrome. Free from Semrush; what a free account adds.
Free
- Windows
- macOS
- Linux
Lighthouse
Lighthouse is built into Chrome DevTools, but the npm CLI lets you script audits and save HTML, JSON or CSV reports. Node requirement and basic usage.
Open source
- Windows
- macOS
- Linux
Sitebulb
Sitebulb crawls your website and explains what to fix first. Desktop app for Windows and Mac with a 14-day free trial; Lite and Pro plans compared.
Trial
- Windows
- macOS
Screaming Frog SEO Spider
Find broken links, redirects and duplicate titles with Screaming Frog SEO Spider. Free for up to 500 URLs per crawl; what the paid licence unlocks.
Freemium
- Windows
- macOS
- Linux