YACP allow you to add a countdown to any Wordpress post or page. It's god damn easy-to-use, open-source, and developer friendly.
YACP is easy to install, just drag and drop the zipped version into the Wordpress Plugin installer.
YACP is 100% shortcode based, and you can create unlimited countdowns for your website. There is no premium version.
YACP is open-source, you can access and read the source code. Anyone who want to contribute is welcome.
YACP is developer friendly and based on simplycountdown.js, anyone with basic CSS skills can create a custom countdown theme.
By choosing the My Custom CSS theme in the configuration page,
that will create a countdown without any styles. The created countdown will have the
simply-countdown-custom class
See the custom CSS template for more information.