In short this is web mobile todo list. You can access your todo list wherever you are: home, work, holiday. But who is actually the Robot19 you can see here. (yes, we are in contact with Robot19 but do not ask much about it as his location is kept secret similar to Are52)
You do not need to install ANYTHING on your mobile or PC, just point your browser to http://robot19.com and here you go.
Give it a try!
p.s. We are using current version of Robot19.com to build Robot19.com (eat what we produce)