Tools to monitor website traffic are important for website managers to see how their websites are reaching their audience. Many websites rely on Google's free Analytics service to fill this role. However, concerns about Google's wide reach across the internet have caused some website managers to seek an alternative. Piwik aims to be that alternative, with analytics capability similar to what Google Analytics provides in a package that website managers can install and run on their own server. It also provides a number of unique privacy features, such as opt-out and support for do-not-track. Similar to Google Analytics, Piwik is added to a website by placing a snippet of code in the header of all pages. Plugins to add this code are available for most common website platforms (Drupal, Wordpress, phpBB, Magento, etc). Piwik requires a web server that provides PHP and either MySQL or MariaDB. Piwik is also available as a hosted service for a monthly fee.