What’s the difference between RyuJIT and Roslyn? Technology Community › Category: .NET Core › What’s the difference between RyuJIT and Roslyn? 0 Vote Up Vote Down VietMX Staff asked 4 years ago Roslyn is the compiler that compile your code (C# or VB) to IL. RyuJIT is a Just In Time compiler that compile your IL to a native code. Both of them are now open source.