Rontu

PiwikCounter is a Counter which needs a Piwik installation under your control. Without it, it won’t work. 
It get’s its data through Piwiks API and caches the amount of visits until yesterday and just adds the amount of visits for the actual date.

PiwikCounter

PiwikCounter allows you to show the summary of (unique) visitors as a widget on your blog.

rbaer

This is a unofficial, basic WordPress plugin for the Matomo web analytics software platform. 
It adds the Matomo javascript code into every page of your website, so you don’t have to code PHP to add it to your templates.
It is based quite heavily on the (no more supported) Piwik Analytics WordPress plugin which itself is based on the (no more available) Google Analytics wordpress plugin by Joost de Valk.
The following options are supported:
<ul>
<li>matomo hostname</li>
<li>matomo path</li>
<li>site ID</li>
<li>option to control download tracking</li>
<li>option to exclude the admin user (probably you)</li>
</ul>
Please note, this plugin requires a self-contained Matomo installation somewhere under your control. It does not include Matomo itself.
See also <a href="https://matomo.org/" rel="nofollow ugc">The Matomo Website</a>.

Simple Matomo Tracking Code

This unofficial plugin adds the Matomo Web Analytics javascript code into the footer of your website. It has several useful options.

PiwikCounter vs Simple Matomo Tracking Code