Bonny85

LB Users Counter is a plugin for WordPress. Allows you to add a widget to a sidebar, where you can view some attributes with respect to the number of users browsing the website (online, offline and online user name).
API Reference
User Class
This class contains the static methods for get info of users login
<ul>
<li>
User::getUserOff() This function get number of users offline.
</li>
<li>
User::getUserOn() This function get number of users online.
</li>
<li>
User::getNameUserOn() This function get the names of users online.
</li>
</ul>
<a href="http://www.lucabonaldo.it/lb-users-counter/" rel="nofollow ugc">Documentation in Italian</a>

LB Users Counter

Allows you to add a widget to a sidebar, where you can view some attributes with respect to the number of users browsing the website.

SandyRig

SRS Simple Hits Counter is a simple, very lightweight visitor counter plugin for WordPress that tracks Unique Visitors and Page-views — without causing render blocking or straining your site.
You can display your visitor counter anywhere on your site using widgets or shortcodes. Show Unique Visitors, Page-views, or both — just use two copies of the widget or shortcode to display both counters together.
Note: The counter keeps running in the background even when no widget or shortcode is active. To completely stop counting, you need to disable the plugin.
<h4>Features</h4>
<ul>
<li>AJAX based counter ignores most bots or crawlers</li>
<li>Monthly and weekly graph in admin</li>
<li>Show the Unique Visitors, Page-views count or both</li>
<li>Ability to reset the counter to any number any time</li>
<li>Can be shown anywhere on the site using Widgets and Shortcode</li>
<li>Counter works and shows data in admin even when no widget or short-code is active</li>
</ul>
<h4>SHORTCODES</h4>
[srs_total_visitors] for Unique Visitors 
[srs_total_pageViews] for Page-views
<a href="https://atif.rocks/srs-simple-hits-counter/" rel="nofollow ugc">DEMO</a>

SRS Simple Hits Counter

Display unique visitor or page-view counts anywhere on your site using widgets or shortcodes — Simple, very lightweight and no third-party code.

LB Users Counter vs SRS Simple Hits Counter