Ubisoft
Harmony offers Free Trial, but Rive does not.
Rive is designed for Individuals, Medium Business and Small Business.
Harmony is designed for Large Enterprises, Medium Business and Small Business.
Pricing for Rive Starts at $14/User/Month when Billed Yearly whereas for Harmony Starts at $20/Month.
Some top alternatives to Rive includes Harmony, Loading.io, Animation Desk, Adobe Animate, Adobe Character Animator, Spline, Stream Chat, Text Chat Animator, Flow and ImagickPro.
Some top alternatives to Harmony includes Marionette Studio, Animatron Studio, Animaker, Animation Desk, Create Studio, Adobe Animate, Maya, MakeStoryboard and ImagickPro.