Hm, okay, that one link in that one location marks it as “Pro”.
The page itself doesn’t mention it, also no hint in the main-nav on the left.
I ran into the mentioned page after a google search, next place I looked was the free / pro comparison page (not mentioning manual bookings at all).
No worries, I am fine with this thing being pro. But maybe you could label those things a bit more obvious ??