Calendly offers Free Trial, but B12 does not.
Calendly is designed for Individuals, Freelancers, Large Enterprises, Medium Business and Small Business.
B12 is designed for Medium Business and Small Business.
Pricing for Calendly Starts at $8/User/Month when Billed Yearly whereas for B12 Starts at $24/Month when Billed Yearly.
Some top alternatives to Calendly includes Appointy, Acuity Scheduling, Setmore, Microsoft Bookings, Cogsworth, Book Like A Boss, Doodle, Tidycal, Cal.com, DaySchedule, Google Calendar, Calendar and Zoho Booking.
Some top alternatives to B12 includes Unbounce, VWO Deploy, Wix, Jimdo, Weblium, 8b, WebsiteBuilder, Format and Web.com.