NinjaFirewall (WP Edition) is described as 'True Web Application Firewall. Although it can be installed and configured just like a plugin, it is a stand-alone firewall that sits in front of WordPress' and is a web application firewall in the security & privacy category. There are more than 25 alternatives to NinjaFirewall (WP Edition) for a variety of platforms, including Wordpress, Self-Hosted, Web-based, SaaS and PHP apps. The best NinjaFirewall (WP Edition) alternative is SafeLine, which is both free and Open Source. Other great apps like NinjaFirewall (WP Edition) are PressVuln, coraza, Jetpack and Sucuri.