Welcome to OS^? Subscription. This site will go into the subscription OS feature for Senitrus OS. There are some differences between this OS, and the primary OS of Senitrus Systems, and that is this OS has a larger, and more complex kernel. The regular OS supports Snapdragon CPUs only which are ARM based CPUs. This extra work will be one of the reasons why this OS is a subscription. However, it will be cheaper than buying a Senitrus OS PC if you are on a tight budget. The subscription will be available in monthly, or annually. You will receive a 15 day trial. Limit only 1 trial per year per customer.