We switched to React Native for Bitesnap after developing the initial prototype using swift. We've been using it for almost a year now and have no regrets. It allowed us to ship our product to a much larger audience without slowing us down.

Users seem pretty happy with the product as well, we've had no complaints about performance aside from a barcode scanning issue on older android devices.

https://itunes.apple.com/us/app/bitesnap-photo-food-journal/...

https://play.google.com/store/apps/details?id=ai.bite.biteap...