A free program for Android, by NoNonsenseApps.
Feeder is an open-source feed reader for the modern web. Feeder is not affiliated with any company and is completely free to use. It was built to be simple to use and is the best option for people who don’t want to spend hours on setting it up and creating an account.
It supports all the major feed formats, including JSON. You can read all of your favorite blogs, news sites, and any other website that provides an RSS or Atom feed.
You don’t have to create an account to get your feeds. You don’t have to set up any subscription or pay for an access.