The new standard




Used Worldwide

Rival Theory’s RAIN technology is used throughout the entertainment industry for the creation of intelligent characters. RAIN is a modular, extensible, free AI Engine that encompasses every element needed to create characters in digital entertainment. There is no “paid” version, RAIN is the entire professional-grade engine. Today, RAIN has become the gold standard for AI inside the Unity game engine. It’s used everywhere by studios large and small to create outstanding behavior and engaging gameplay.


Proven Performance

RAIN has been specifically engineered to meet the demanding challenges of creating interactive characters. This means RAIN is intuitive, flexible, and powerful enough to handle an astonishing amount of complexity while offering cutting-edge behavior control.

Rival Theory’s RAIN has been developed to deliver outstanding performance whether you are working with next-gen consoles, PCs, or mobile devices. This means that in your own project, you can trust that RAIN is ready to help you unleash your creativity.


Some benefits of RAIN include:

  • No license fees or other costs
  • Increased development speed
  • Limitless title and platform publishing
  • All technology upgrades and updates included
  • Cross-platform compatability
  • Full access to a moderated support forum
  • Code samples and API documentation
  • Access to full Wiki documentation
  • Supports both Unity Free and Unity Pro




  • Cross Platform