I’ve been using Omnivore (a “read it later” app), which I otherwise love, but even though it’s an iOS app, offline support is one of its biggest weaknesses.

As far as I know, it’s using some caching library at the HTTP level (as opposed to handling its own persistence at the application layer), and in falls apart every time I have a poor connection, remaining broken (even after fully going offline) until I’m back online.