When comparing Prismatic vs NewsBlur, the Slant community recommends NewsBlur for most people. In the question“What are the best Feedly alternatives?” NewsBlur is ranked 3rd while Prismatic is ranked 9th. The most important reason people chose NewsBlur is:
NewsBlur has a discovery algorithm that users can "train" to show stories they are interested in and hide ones they don't care about.
Specs
Ranked in these QuestionsQuestion Ranking
Pros
Pro Gesture-based design and intuitive user experience
Prismatic is extremely fast to use and utilizes clever gestures to make it easy to navigate. Apple reportedly sent them a letter saying that it’s Engineers are looking into how they managed to build such a good app.
The app does not utilize tradition navigation bars in order to enable full screen browsing. This makes reading long form content or viewing images a fantastic experience on mobile.
Pro News feed optimization
Although Prismatic has a fantastic design, its biggest differentiator from the competition is its best-in-class algorithms that determine what goes into the news feed.
Prismatic uses G+, Twitter, and Facebook feeds to evaluate what the user is interested in. Sources and lists can then be edited to add or remove certain topics.
This app monitors usage and feedback in order to further evaluate user preferences and fetch the most desirable information.
Pro Excellent content discovery algorithm
Amazing algorithm for discovering new and meaningful content. Uses friend and user similarity and sharing to determine the relevancy of content.
Pro High compatibility
Prismatic is available on desktop, iOS, and Android.
Pro Utilizes user location
Prismatic uses current location in order to find local news. If this feature isn't wanted, it can be turned off.
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 Fast to use
Very fast to navigate around the UI and load articles.
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 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 Share stories with comments
Burblog is a simple, customizable website for sharing stories with comments that people can subscribe to.
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 Free / Libre software
NewsBlur is FOSS, so it can be freely modified & redistributed.
Pro Freemium service
Free version has a limit of 64 sites. Upgrading to unlimited sites costs $1/month.
Cons
Con Doesn't exist anymore. ADMINS can you please take this down?
<looks up at sky> “TECH SUPPORT!!”
Con Formatting issues
Prismatic tries to reformat articles, and many times this is done unsuccessfully. Users commonly have to deal with overlapping text, missed captions, missing pictures, and other formatting errors.
Con Lacks a built-in RSS feed reader
The only option is as a curated aggregated feed. There is no provided way to supply ones own feeds via OPML for example.

Con Freemium
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.
