I use PocketCasts from Automattic, mostly on Android, sometimes on iOS, sometimes in my laptop's browser. Although the software is open source it used not to be, and I'm grandfathered into the "premium" plan because I purchased the app years ago when it was still Shifty Jelly's and didn't have a subscription option. The grandfathering was a thank you to all the customers who supported them by buying the app in the early days.