Activiti Cloud uses at it's core Activiti 7.x which is an evolution from Activiti 6.x. But as mentioned before, Activiti 7.x will bring some changes in how we recommend to do things. Most of these changes will be simplifications to make sure that the framework itself doesn’t promote practices that have been recognised to cause huge pains in real life implementations. All these changes and simplifications are done with cloud environments in mind. If you are using Activiti 6.x or 5.x and it is working fine for you, don’t worry Activiti 7.x will work for you. But if you are looking into microservices and cloud environments and you are suffering to adopt BPM tools and frameworks Activiti Cloud will solve most of those problems for you. It is also important to note that Activiti Cloud is built on top of award winning frameworks that are widely used in the industry, for this reason, you don’t need to hire specialised developers to extend and improve Activiti Cloud Services.