I’m not an expert but it would be more helpful to phrase your question more specifically. What do you mean without the default App class? Consider describe what you are trying to achieve?
If you mean you want a WinMain function, as well as cinder, then you can do what I have done before which is to unroll the CINDER_APP macro and then add your code. This is probably shunned upon though
Eg. Instead of:
int __stdcall WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
cinder::app::RendererRef renderer(new RendererGl());
cinder::app::AppMsw::main<imageApp>(renderer, "imageApp", &imageApp::prepareSettings);
But you still have an App class and it doesn’t buy you too much.