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I want to share my list of attributes for a single feedreader (to be used in the feedreader matrix).
Can you help me adding some more features to organize feed readers?

Feed reader:

1. Name
2. Type (web, client)
3. OS (windows, osx, linux..)
4. Cost (free, $)
5. Import / export
6. Sync with other feedreader
7. Views (newspaper view, custom, 3 panels…)
8. Sorting (date, custom order, relevance)
9. Organize (tagging, foldering, marking)
10. Search
11. Api
12. Interface (simple, complex, standard, futuristic)
13. Keyboar shortcuts
14. Ignore duplicate posts
15. Stats of your habits
16. screenshots

is there more? Can you help me to identify what feature can help to choose your next feed reader?

Planning to make a “feed reader” matrix comparison. There will be 3 functions:

1. Adding feed readers to database (collaborative contributions)
2. Browsing feed readers list and informations
3. Filtering the best feed reader by choosing features

This is an image of the last function:

What do you think? Will you contribute adding feed readers to database and specifing features?