Font rendering is too light

Kami is awesome but it’s font rendering is too light, as compared to the default pdf viewer in Chrome. (I’m on a MacbookPro with a retina display.) This really hurts my eyes, making it unusable. Is there any option to increase its boldness/thickness, anti-aliasing?

I meant the Kami app itself vs other pdf viewers I’ve used (Chrome, Skim, Preview,…). It happens to every pdf. See this screenshot for a comparison between Kami and the default pdf viewer in Chrome.