Besides a program, UI Drafter is a technique. With it, you can figure out the user interface elements and devise their progression alternatives with minimal overhead.
For that, unlike wireframing, it doesn't require graphic design skills. For example, there's no need to keep track of screen sizes and layout concerns.
Therefore, like a screenwriting program, you can organize, brainstorm, and try ideas in total focus at your thinking pace.
Get more accurate usability feedback than testing mockups. UI Drafter lets you take out of the equation the extra awareness, imagination, and memorization needed to evaluate them.
Besides purer feedback, discover your blind spots and missing pieces before building. All that it's possible now that you can communicate what you are trying to achieve in a functional prototype.
Try out page flows, groupings, and progression variants.
Experiment with different labels and UX writing practices.
Discover edge cases early on.
Convey complex requirements in a tangible live spec prototype.
Make the graphic design phase feel more familiar and direct.
Stay in focus easier.
Plan a little bit,
save a lot of rework.