Card Sort cluster analysis tool 1.5

Modified Thu, 17 Mar 2016 03:31:17 +0100.

Card sorting is a user research method used to determing and verify the structure and hierarchy of a website or service. It is fast, reliable and inexpensive and can provide insight into users' mental models.

Card sorting can be done with physical cards or over the web. One of the best on-line card sorting tools is OptimalSort, which can be tried for free. OptimalSort only provides a list of results, which is very difficult to understand and analyze. This is where this Card Sort cluster analysis tool comes into use. It takes the results list from OptimalSort and translates them into an understandable table, similarity matrix and an interactive treeview. See sample data and sample output. Please note that neither your data nor the results are stored. If you encounter problems, please send feedback to

How to use

  1. Create a card sort project with OptimalSort (can be done for free)
  2. Export All raw data in CSV (Comma Separated) format
  3. Upload the file with the form below and let the script analyze your data. This will take a few seconds.
  4. Send feedback to This tool is free and will remain free. All I ask is to let me know how to make it better.

Planned updates


Known bugs and problems

CSV file
Skip categories labeled