You are sizing up a market. These filters come from what each product claims about itself: how it positions itself, what it charges, who it names as an alternative, what proof it publishes.
“Build with DayFlow Add a production-ready calendar to your product. Start with the open source packages, then move into Pro views when your scheduling workflow needs resource planning or printable operations output.” — its home page
We have not read this one closely yet. Nothing is claimed here on its behalf.
