Found a very cool project: https://expo.io
I already started working on react native client for Mongo Explorer, but decided to check Expo first. I had another project I wanted to build – food ordering api, so I decided to build it with Expo. Here is the source: https://github.com/alishdev/food-ordering-app
The Expo experience is extremely positive. Very quickly I was able to build a simple mobile app and run it my phone (even without Apple developer license). I see how useful could be to use Expo when you working on UI/UX with the client. Developers can quickly build screens so customers can test them on their phones when developers share the link to the project.