I got so fed up with podcast apps making me feel guilty for not keeping up that I built my own.
It's called Crest 
The idea: episodes flow like a river, not pile up like a to-do list. Each show gets one slot in your queue by default. New stuff goes to the end, not the front. Private by design, no ads, no recommendations.
It's now in public beta on iOS — would love for people to try it and tell me what they think!
Crest — Fresh podcasts, always.
Crest queues the freshest episodes from your favourite shows — so you're always current, never overwhelmed by a backlog.
(crestpodcasts.com)