Ask HN: White or Black website? Which converts better?

hey!

We're making a tool for automated UI testing. So we did a website for this tool in 2 colors.

One is white: https://flawlessapp.io/white-x Another one is black: https://flawlessapp.io/x

which one would you pick?

I read some researches, that while converting better, but many development tools are actually dark colors... We don't have enough data (traffic) to A\B test in now and it's a very radical difference. Interesting to know your thoughts.