The GP asked "Don't laptops exist anymore" to that I answered. And no - a webapp isn't an alternative for those crappy laptops, filled with viruses, outdated browsers, and/or weird privacy plugins the (grand-)son installed are not an alternative. (We could argue about requirements of integrity here ... an app can offer a little bit more than a webapp on an arbitrary windows PC ... But integrity can be guaranteed by having the second channel (other people watching and then comparing published results) as there is no secrecy involved (for one we talk about summaries, for second caucuses are public anyways))