Defender is described as 'Adds the best in WordPress security to your website with just a few clicks. Stop brute force attacks, SQL injections, cross-site scripting XSS, and other WordPress vulnerabilities with Defender malware scans, firewall, and two-factor authentication login security' and is an app. There are more than 25 alternatives to Defender for a variety of platforms, including Wordpress, Self-Hosted, Web-based, Android and SaaS apps. The best Defender alternative is ScanTower, which is free. Other great apps like Defender are PressVuln, Jetpack, Sucuri and Wordfence.