Epic Games announced that the $19 a month fee for developers would be replaced by a royalty fee system on any Unreal Engine 4-based app or game. Epic Games will now take 5% of gross revenue generated by an Unreal Engine 4-based app or game every quarter after it reaches $3,000.
Epic Games first introduced the budget-friendly $19 monthly fee for Unreal Engine 4 in 2014. Unreal Engine 4 can be used to develop games and apps for Windows 8.1 and the Xbox One, along with other platforms._Epic Games has also indicated that Unreal Engine 4 will support Windows 10. Epic explains why they're offering Unreal Engine 4 for free:_



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