This requires the FREE version to be installed first.

Really Simple SSL pro contains an extensive scan for mixed content issues, access to premium support, HTTP Strict Transport Security and more!

Extensive scan which enables you to detect the source of mixed content that couldn’t be fixed automatically, with fix button

Premium email support (details)

HttpOnly and secure flags to make the cookies more secure

Improve security by enabling HTTP Strict Transport Security for your site

Submit your site to the HSTS preload list

Warning by email and in your SSL dashboard when your certificate is about to expire

Mixed content fixer for the back-end

Easy implementable security headers: X-Content-Type-Options, X-XSS-Protection, X-Frame-Options, Expect-CT, Certificate Transparency, No Referrer When Downgrade header, Content Security Policy. Read the security headers article for more info.