Middling app except for one feature – iCalendar Review

iCalendar has got really cool 'visible range' filtering (i.e., display only those events that occur between a chosen start hour and a chosen end hour) but otherwise the app is middling. Pricing is good (no subscription!) but the pricepoint is high (unless you care for visible-range filtering, in which case the app is an excellent value)... Developers say in release notes 'we respond to every email we receive' but that's nonsense; I've sent numerous emails and have not ever heard back... Do you care for visible-range filtering? If so then you'll like iCalendar, if not then probably you won't.
Review by Wooooooooooooooo0 on iCalendar.