For unreal, I think the first $1 million USD of lifetime gross revenue of the game is royalty-exempt, and then you pay. Then I think it is 5% of revenue. For un

For unreal, I think the first $1 million USD of lifetime gross revenue of the game is royalty-exempt, and then you pay. Then I think it is 5% of revenue. For unity it is free if revenue or funding is less than $100K in the last 12 months. That is just the basic implication from a cost perspective. I am not a game developer but there is likely a bunch of other considerations, both legal and technical.