dx2systems

This hit counter is a light weight way to track the hits on all posts, including custom post types on your WordPress blog. The plugin uses ajax to count the hit which means it will have no affect on the speed of which the page loads. This also leads to a much more reliable hit count as the hit is not actually counted until the page has loaded. To the end user this hit counter will have almost no affect on the pages load speed.
Your traffic stats are can be viewed quickly from the dashboard widget that will give you a daily overview of the most popular posts along with the total hits on the website for the past few days.
When logged in as an administrator you will be able to see the number of hits that a page has from the WordPress admin title bar. When editing the post you will also be able to see the number of hits the page has received and have the ability to reset the counter if needed. Admin hits will be automatically be discounted to save the hit count being inflated due to testing or other general use of the site by any of the administrators.
A few notes about the sections above:
<ul>
<li>Light weight method to count page hits.</li>
<li>AJAX powered recording system</li>
<li>Dashboard widget for traffic overview</li>
<li>Administration tools to manage hits</li>
</ul>
https://dx2systems.com/

DX2 Post Hit Counter

A lightweight counter to track the number of hits on all posts on the website.

sanarena

Hit Sniffer service has shutdown on September 2016 
This plugin now serve as a memorial and soon to be deleted.
Those who look for similiar services, they can use Hit Steps.

Hit Sniffer Live Blog Analytics

Hit Sniffer was a powerful real time website visitor activity tracker.

DX2 Post Hit Counter vs Hit Sniffer Live Blog Analytics