DMARC Checker is described as 'Offers a straightforward, free solution for checking your email's DMARC setup. It ensures that DMARC, an security protocol that builds on DKIM and SPF, is correctly implemented to protect your domain from impersonation and email fraud' and is an website in the business & commerce category. There are three alternatives to DMARC Checker, not only websites but also apps for Self-Hosted, Docker, Mac and Windows. The best DMARC Checker alternative is DMARCguard, which is both free and Open Source. Other great sites and apps similar to DMARC Checker are DomainPreflight and TrustedMARC.