I like to use Hermit[1] to browse sites that have a dedicated app for viewing (Reddit, Instagram, and Twitter are of note). It's marketed as a "Light app browser". and lets you add your own with relative ease. Unfortunately they do not have an iOS version[2] yet -- but the Android experience is quite decent.

[1] https://hermit.chimbori.com/ [2] https://hermit.chimbori.com/early-access