What are some alternatives?
When comparing React Native Starter and SimPholders, you can also consider the following products
React Native Desktop - Build OS X desktop apps using React Native
IBM MobileFirst - IBM MobileFirst provides enterprise mobility solutions.
Evothings - Evothings is a mobile application enabler for the Internet of Things (IoT) industry
NativeBase - Experience the awesomeness of React Native without the pain
Offset - Premium stock photos + illustrations
LITHO - Litho is an input device for the real world.