In documentary and the reality shows I’ve worked on, everyone uses Microsoft Word for writing. No one loves it, but they use it because the client requires you to deliver the script in a table with cell numbers on each line, to make it easy for the lawyers, I suppose. But the truth is that now there are plenty of writing tools that are designed to be a bit more helpful to a writer than simply being a fancy typewriter. Tools that help you visualize overall story structure, manage research, and work on the writing all at once.
For almost a year, I’ve been using one of these tools on my iPad (and desktop) called Storyist. The other big app in the category is Scrivener, and that’s the one I used first.