If you only care about iOS and a layer on the backend that can sit between your actual app server and the client you could consider Jetstream: https://github.c

If you only care about iOS and a layer on the backend that can sit between your actual app server and the client you could consider Jetstream: https://github.com/uber/jetstream https://github.com/uber/jetstream https://github.com/uber/jetstream-ios https://github.com/uber/jetstream-ios It's a considerably different model however. More about realtime updates.