BazQux Reader is a very fast RSS feed reader with simple and clean user interface.
It can subscribe to Twitter/Facebook/Instagram/Telegram/VK pages, able to retrieve full article text, shows comments to posts, has search and filtering, dark/sepia themes, font selection, several view modes (including mixed), sharing and bookmarking to popular services.
It is commercial service with a 30 days free trial and then $30 or $50 pay-what-you-want annual fee. More Info »
Mobile and desktop apps
Use Reeder , FeedMe , Feeddler RSS Reader , Slow Feeds , News+ and ViennaRSS . On iOS, Android and Mac.
ReadKit works with BazQux Reader set as a Fever server.