I was surprised to see the mention of Rollout which I hadn't heard of which claims to allow you to push hot fixes to native iOS apps. Although I've been out of the iOS game for a while, I recalled this being against Apple's ToS. Apparently this is is still true to some degree, but they have an interesting blog post about how they can work around these restrictions.

https://blog.rollout.io/2016/01/updating-apps-without-app-st...