AresIT

Activity Ninja is a WordPress plugin designed to track the history of wp-admin option updates. It records which logged-in user made the changes along with the timestamp. This helps administrators keep track of changes made to the website’s settings, providing an essential audit trail for security and accountability.
<h3>Features</h3>
** Tracks changes made to wp-admin options. 
** Records the username of the logged-in user who made the change. 
** Logs the timestamp of each change. 
** Simple and easy-to-use interface.

Activity Ninja

Everything you need for a monitoring of activity in your WordPress Admin Area.

Shash

Track and receive notifications for who logged in, who changed the theme, who activated/deactivated a plugin, failed login attempts, password requests, etc.
Note: This plugin required a operational.co account. Operational is a SaaS Event tracker tool for tech products.
Why use this?
<ul>
<li>Event logs are stored on external servers. If your website goes down, your logs don’t go down.</li>
<li>With existing WordPress activity log plugins, they add logs in your WordPress website, which might slow down your website</li>
<li>Unlike WordPress activity log plugins, you can receive mobile notifications for your activity logs.</li>
</ul>

Activity Ninja vs Operational