If you intend to use The Ruby Spreadsheet on Heroku, and your source code is closed source then 0-4 2X dynos at 100% CPU load are considered as one physical CPU (1 PX). In other words, this means that if your Software runs on Heroku, is not OpenSource and uses The Ruby Spreadsheet gem you will have to buy a NON-OpenSource Commercial License that allows you to use The Ruby Spreadsheet together with your closed-source code.
October 24, 2014
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The Ruby Spreadsheet 
How do you buy a commercial license?
Comment by harrisreynolds — October 27, 2017 @ 2:01 am
I just sent you a Mail. I need the amount of CPU cores and your Use Case how you intend to use Ruby Spreadsheet.
Comment by zdavatz — October 27, 2017 @ 6:11 am
How can I get a commercial license?
Comment by Sait M. Ilhaner (@bing111) — January 30, 2018 @ 8:46 pm
I just sent you an Email. Did you get it?
Comment by zdavatz — January 30, 2018 @ 9:02 pm
Email me at zdavatz at ywesee dot com
Comment by zdavatz — January 31, 2018 @ 9:44 am