Basically, what the title says. Do you use any app, that is proprietary, but either has no OSS alternatives or they’re all not good enough? If there is an alternative, what keeps you from switching?
There are so many. By usage however:
Smart Audiobook Player: None of the apps I tried had all the features in one, like reading my complex audiobooks folder structure and auto grouping the books based on that. Timer to pause audiobook that is automatically reset by moving the phone.
Maps: No foss solutions work better where I live than GMaps
YTMusic: So this is a tough one to beat because of the nature of the platform itself.
Notes: I am looking for a P2P syncable note app that can also have a web interface or atleast a Linux version of the App. Allows drawing your notes on an android phone or tablet using stylus, and other usual features. Can also use cloud storage as a backup or sync source. I know this one is a really tall order.
A keyboard with swipe typing, multilingual autocorrect and speech to text support that actually works.
Other than that, my only proprietary apps are from commercial services I use and pay for (banking, Spotify, Carsharing and public transport). I’d love for them to become open source, but it’s probably not ever gonna happen, cause they rely on verifying my identity.
I’ve had a good experience with HeliBoard
Japanese has been an open issue for months now, so it’s a nope from me.