I have used Countdown Pro and though it is a stable plugin, you cannot really modify it as per the needs of your website. For example, there are preset colors in this plugin to used for the counter and you cannot change them to blend it with your website. The other counter I used was Countdown Rocket plugin which shockingly hijacked my website and users started seeing ads inserted by this plugin. I immediately removed this plugin and contacted the developer who never responded. I had to raise a dispute and recover the payment.
Scarcity Samurai is also a good plugin to run a countdown but it has its own shortcomings. It works very well if you configure it with your opt in box but otherwise the choices are limited.
The best countdown plugin that was really beneficial to my website is the Countdown Monkey. You can run it on your website with a piece of code and also use it as a plugin. You get a variety of choices in configuring its font, color and also make it evergreen. If you are running a campaign and you are not sure what the counter should do after it ends, you can simply set it to ‘add 1 day’ and the counter will run again automatically. I also inserted this code in a HTML 5 ad banner and saw great results.
