It also has a free plan, definitely worth a try.
"Slack and Dribbble had a baby named Trino. It keeps our design efforts in sync every day."

It would be nice to see its interface or usage in some sort of video. I can see the lists but how they track design part, is there any history for designs, do people easily comment on the designs in real time. I think they could improve their landing page to be more informative. It looks cool but creating an account just to try it out...