Onboarding as a service as an idea? Please help evaluate

Hi folks,

I'm thinking about adding an onboarding as a service product to our offerings. I can see why it's valuable to have great onboarding and how pretty much all SaaS needs it, and many don't build it because it's challenging to make an excellent onboarding flow.

I found many existing solutions, but they are all built as a task list for employees to onboard new customers, not as a self-serve dev tool.