and a article on how it works:
https://themarkup.org/blacklight/2020/09/22/how-we-built-a-real-time-privacy-inspector

https://www.ostorlab.co/

https://www.immuniweb.com/mobile/

https://reports.exodus-privacy.eu.org/analysis/submit/

It can be run locally via https://github.com/exodus-privacy/exodus

• http://privacyscore.org/
• http://webbkoll.dataskydd.net/

Other scanners:

• https://requestmap.herokuapp.com/
• https://requestmap.webperf.tools/
• https://webpagetest.org/
• https://lookyloo.circl.lu/
• https://themarkup.org/blacklight
• http://sitecheck.sucuri.net/   (emphasis on vulnerabilities)
• https://csi.forcepoint.com/         (emphasis on vulnerabilities, single page)
• http://observatory.mozilla.org/     (emphasis on headers)
• http://securityheaders.io/               (emphasis on headers)
• http://urlscan.io/                          (emphasis on interactions while loading URL)
• http://www.htbridge.com/ssl/       (emphasis on SSL)
• https://www.htbridge.com/websec/  (emphasis on headers)
•  http://ssllabs.com/ssltest/
• http://www.magereport.com/     (for magento sites only)
• http://www.ssltrust.info/                (checks for entry on malware, spam lists)
• http://hardenize.com/
• http://webcheck.me/
• http://www.unmaskparasites.com/
• http://cryptoreport.websecurity.symantec.com/checker/
• http://www.scanmyserver.com/
• http://safeweb.norton.com/

Online web spiders

• http://freetools.webmasterworld.com/tools/crawler-google-sitemap-generator/

“Web Privacy Measurement is the observation of websites and serves to detect, characterize and quantify privacy-impacting behaviors. Applications of Web Privacy Measurement include the detection of price discrimination, targeted news articles and new forms of browser fingerprinting. Although originally focused solely on privacy violations, WPM now encompasses measuring security violations on the web as well.”

https://github.com/citp/OpenWPM/wiki

https://hackapp.com/scanner