Celtx Plus

You don’t need Celtx Plus to write a screenplay. Regular old Celtx will do just fine, and it’s free.

But if you’d like to take full advantage of Celtx’s pretty awesome sketching tool (covered in detail in chapter 9 of Mastering Celtx), and if you’d like to work in truly Full Screen Mode and also track the course of your plot in greater detail, then the few bucks for Celtx Plus are going to be well worth it. Aside from coverage of the sketch tool, the additional add-ons are also discussed and demonstrated in Mastering Celtx.