Yes, both Ring.io and Aircall offer a Free Trial.
Ring.io is designed for Large Enterprises, Medium Business and Small Business.
Aircall is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Pricing for Ring.io Starts at $69/User/Month whereas for Aircall Starts at $30/User/Month.
Some top alternatives to Ring.io includes Compass Payments Suite, Dialer360, Call Center Studio, Truly, Dialpad Contact Center, Channels, ice Contact Center, RingCentral Contact Center, Squaretalk and CloudCall.
Some top alternatives to Aircall includes Novanet Cloud Contact Center, CloudTalk, HoduCC, Call Center Studio, Dialpad Contact Center, 3CX, Vonage Contact Center and RingCentral Contact Center.