We chatted with with Mike, founder of SoPlan ($0/month). In our interview, Mike says:
I underestimated the effort required to launch a business. Building a product is easy. Getting people to know your product is more difficult than I would expect.
My biggest mistake was thinking people would change their behavior to use my app. I did not have synchronization to other calendars in place. I thought people that use my app should use my calendar instead of their own calendar. People just don’t like to change.