Never used Inoreader, but recently switched to Newsblur which is open source (app installable via F-Droid) and selfhostable. If you don’t want to self host they have a freemium model to use their hosted service, couldn’t tell you what free vs paid gets you but I haven’t bumped into any limits yet. You can also log in to their site to browse via web browser.

So far the app looks better than other open source readers I’ve tried and thumbnails generally load so the lists are a bit livelier.