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> I think invented it

I don't think so... the 12 factor app was existing before that... but came to more common usage during the rise of Rails (and Heroku)

Both https://12factor.net/ and the Wikipedia page https://en.wikipedia.org/wiki/Twelve-Factor_App_methodology credit Heroku developers for formalizing the 12 factor methodology.

If you go to the bottom of the page, you'll notice that https://12factor.net/ is written by Adam Wiggins, a Heroku cofounder.

It was (former Herokai here).