If I have RapiTime or RapiTime Zero, do I still need RapiTask or RapiTask Zero?

RapiTime and RapiTime^Zero abstract away from the OS tasking model and only report the execution time of a task as if it were the only thing running on the CPU. If you are interested in the response time of your code, or the interaction between tasks and your OS, you'll need RapiTask or RapiTask^Zero.