The site says that "Radar is entirely free for open-source maintainers.".
Can you please elaborate on this? I understand it as if you're contributing to any open-source software, and can prove it, you will get won't be asked to pay?
You will find it on the pricing page when Radar comes out of beta. The only thing I'm confused about is what kind of criteria I have to set before giving a free license to the person who wants to claim the offer? I'd appreciate it much if any of you guys can help set the criteria.