Android OPML apps

I’m working on a project with a friend, and I love OmniOutliner - but my friend is totally of the Apple ecosystem. When I want to export my outlines to OPML files, I can’t find a good app for him to download to view them. XML isn’t super-readable to him either. I’m so used to having an abundance of apps that can handle formats like OPML; does anyone know of anything for Android?

I found this:

Just go to the Google Play store and search OPML and you’ll find numerous Android outliner apps. I know someone who uses Halna.

If he’s got a desktop (Mac/Windows) machine he can read OPML in Chrome (or any Chromium browser) with this free plugin: