As far as I know, only Downread (disclaimer: my beta app) has that: https://feeds.downread.com/signup?i=hn-c-32513232 https://feeds.downread.com/signup?i=hn-c-3

As far as I know, only Downread (disclaimer: my beta app) has that: https://feeds.downread.com/signup?i=hn-c-32513232 https://feeds.downread.com/signup?i=hn-c-32513232 You can select a max number of posts per feed, max age and enable/disable tracking of unread posts on a per-feed basis.