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Wordfence is a widely used WordPress security tool featuring functions like firewall and detection and removal of malware.
Another feature is Endpoint Firewall Protection which blocks IP addresses and maintains a database of IP addresses that have launched attacks worldwide. Moreover, this plugin replaces malware found with the original file and provides login protection.
This tool is available in both a free version and paid version priced according to how many licenses are purchased, with a steep discount the more licenses you use.
iThemes Security Pro is a popular WordPress security plugin that works to protect websites from security issues. Unlike MalCare, iThemes Security pro does not include an in-built malware scanning tool, but can use the Sucuri online tool to perform this function.
Additionally, it offers login protection, website monitoring for security threats, 2-factor authentication, and security check feature preventatives.
Prices range from $80 to $199 per year, broadly in line with Malcare's $99 to $299, although with iThemes, the different plans add in additional sites (with the most expensive covering unlimited sites) - all of Malcare's licenses are for a single site, they just include additional features such as more frequent scanning, backups, integrated staging site, etc.
Sucuri is an entirely cloud-based Web Application Firewall (WAF) that works for WordPress and other CMS platforms. The WordPress Security & Scanner plugin offers basic security, but integrates with the Sucuri WAF.
Malcare's firewall is a part of the plugin (rather than being cloud based) meaning that traffic will get to your server and be analysed there before being rejected or sent on to WordPress itself.
However Malcare does offload the more CPU intensive parts of it's operation to it's own servers so as to not consume too much in the way of resources for your site.
The Sucuri plugin is free to download with three premium paid plans for the Web Application Firewall available beginning at $199 per year.
All in One WP Security is a free WordPress security plugin with no paid plan. It utilizes a points system to indicate how well its security measures are operating.
It has a free edition from basic to intermediate and consists of a firewall, database backup, login security, and more. It utilizes charts and graphs to make understanding easier for users.