Question: The normal tools we use for error tracking native apps don't really work since the crash reports contain minified js. The tools we use for web apps don't seem to support react native. Are there services that do support react native and if not do we have any other options to get useful crash reports?

Answer: 
Heads up that [Bugsnag](https://www.bugsnag.com) released [official support for React Native](https://github.com/bugsnag/bugsnag-react-native) to get crash and error data on both the js layer and the underlying OS.

It does handle minified JS using sourcemaps. These can be hosted by you and referenced from Bugsnag or hosted via Bugsnang's API.
I know of two ways this is being done. First, Crashyltics. I use it, but it requires a few tweaks apparently to bubble up the javascript side of the fence. Here's a great article by delivery.com on what's involved with that...

[Add Crashlytics to your React Native iOS app](https://medium.com/delivery-com-engineering/add-crashlytics-to-your-react-native-ios-app-69a983a9062a#.dsnsvhk14)

Second, here's a react native integration with Sentry

[Sentry for React Native](https://docs.getsentry.com/hosted/clients/javascript/integrations/react-native/)

Hope you find these useful.