I'd considered using Wallabag years ago. How has it evolved in recent years?
Other than that, it works pretty well with most text-based content. I'm using it through the Android app occasionally, and while the app won't win any design awards, it serves it's purpose.
But the state of the iOS app is, well, not great. Clunky design, with odd syncing. Which is unfortunate as 99% of my use case is reading it on my phone whenever I’m waiting for something.