C++Builder allows you to target Windows, iOS, Android and macOS, and very soon Linux as well. Keep the same frameworks and the same code, and only rebuild. C++ is natively compiled, targeting the CPU - not a bytecode or interpreted layer - on all platforms.
Sometimes, C++ needs a little extra. We have language extensions not yet in the standard to handle property/method/event models, object-method pointers, reference counting, and more. You don’t need to use those if you don’t want to, but they solve problems and make your code cleaner.
Use one compiler, one debugger, one IDE, and four platforms, native right down to the core.