I don't think I'm planning to go open source, although I have to get through the whole "have an actual application to start letting people beta test" stage firs

I don't think I'm planning to go open source, although I have to get through the whole "have an actual application to start letting people beta test" stage first. Even if it's a commercial program my thought is "pay a single price once, not a subscription," and probably under $100. Arc Studio looks like it's a screenwriting program, which is a different animal, though. Have you tried out Fade In (https://www.fadeinpro.com https://www.fadeinpro.com), which is a $79 one-time fee? I haven't used it, I confess, but I hear great things about it. (I used the even cheaper Highland Pro for my one try at screenwriting so far, but that was a learning exercise.)