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The following features of the commercial version are missing in the free version:
- Community style
- Support of the mobile view
- Statistics
- System- and space-wide questions and answers link from the header barBetter support of topics with many questions (1000+)
- Show similar questions when asking a new question
- Show similar questions in each question page
- Used labels sections in the overview
- Answered by me filter
- Liked by me filter
- My favorites filter
- Better usability
- etc.