Open source status ?

A newbie here, and trying to find solutions to embed a 2d game into an existing Android app. Unity 3d and Corona cards, both look promising. But before I invest time learning either of them, wanted to know if Corona cards are open sourced or are they a paid product. The current website still shows the license pricing. So checking here if someone can confirm the current status.
Would greatly help me making a decision.

Thank you,

I’ve never used Corona Cards and I don’t know if their source code is released yet, but as far as I’ve understood, they should be free to use and can be downloaded from


Thank you seems I might be able to use them from the above link. Will get back with my findings.