ES6 + Flow vs Typescript, what's the difference?

I recently found flow, and have been meaning to have a go at it for some time now. iv also been using TypeScript on and off for the past year.

anyways so here is my question. whats the difference between using es6 + flow and using typescript? i know there are a few things that typescript has that neither flow nor es6 have, like interfaces. but at first glance they seem very similar.

anyways hopefully you guys and clear this up for me. thanks.