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During testing of my mobile app -- some of my volunteers don't have smartphones or aren't able to do the installation on their mobile devices. It would be great to give them access to either an online version (like MIST) or desktop version (like Graphite) of just the simulator tool alone where they can test the mobile app -- without fear of them changing any of the files or programming. I would prefer the Graphite one since that one will run my external web services.