Вопрос просто огромный и могущественный

TestRail Hosted is our cloud / SaaS edition of TestRail. Instead of installing TestRail yourself, we take care of maintaining, securing and updating your TestRail instance – no IT required.

Instead of paying an upfront licensing fee and for support plan renewals, TestRail Hosted has a low monthly or yearly subscription fee. You will always have access to the latest product versions and you can change the number of users as needed.