investing.com does the same thing, but the charts update live...pretty good little mobile app too...if a little ad heavy (both app and site)I will share a dirty little secret. On Bigchats.com SPX and NDX are both live, you just have to refresh it. (For stocks the chart is still live although the price displayed is delayed.) If you put an Autorefresh app on your browser, you get an almost live chart with being only 5 seconds delayed. So you can get to see how the futures move by this little trick as long as it is RTHs....