I see a lot of people arguing @expo vs @callstackio’s rock. disclaimer: I’m one of the biggest expo fans. if you can use expo, you should. expo is awesome. you can build your whole app with it, even a big one, and ship to the app store in no time. you can also handle scaling yourself in expo, bringing in libraries for debugging, performance, and so on. rock’s purpose is different. an obvious example is when a big company already has a mobile app and wants to gradually move into react native. that’s when scaling, security, and performance challenges really show up. rock brings together the tooling callstack has built over years working with clients facing these exact problems. expo and rock are not competitors. they fit different needs and different contexts. the real value is knowing which one serves you best at the time.