NewsBlur is a fully featured freemium RSS reader with a web interface and native apps for iPhone, iPad and Android. With NewsBlur, readers can see news exactly how it appears on the original site. This app caters to individual preferences by utilizing a tagging system.
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Pro Recommended articles that improves over time
NewsBlur has a discovery algorithm that users can "train" to show stories they are interested in and hide ones they don't care about.
Pro Keyboard shortcuts for fast navigation
By default arrow keys and spacebar are used to quickly navigate stories, but they can be rebound for premium accounts.
Pro Multiple layout & style options
NewsBlur allows users to customize the font size, line spacing, story layout, and type faces.
Pro View content the way it is originally displayed
NewsBlur offers an option of reading articles just like they are displayed on the original site.
Pro Fast to use
Very fast to navigate around the UI and load articles.
Pro Organize feeds into folders
Feeds can be grouped into folders for easier management and to allow users to separate feeds for work, comics, research, etc.
Pro Freemium service
Free version has a limit of 64 sites. Upgrading to unlimited sites costs $1/month.
Pro Aggregates email newsletters
You can forward email newsletters to a user-specific email address to have them aggregated in your feed reader along with your RSS content.
Pro Share stories with comments
Burblog is a simple, customizable website for sharing stories with comments that people can subscribe to.
Pro Free / Libre software
NewsBlur is FOSS, so it can be freely modified & redistributed.
This service is free, but can cost up to $24 per year for premium users.
Con Can't have unread items older than a 14 days/month
This is a premium feature.