Write a story on its spine, and see its joints.
Your story stays in this browser and in the files you save. No account. Nothing leaves the page unless you ask your own provider, with your own key, to read a story.
Paste a short story or a chapter. A model marks its beats, phases, turn, joints and threads. It never rewrites your prose: each beat is your own text, cut where the model's exact quote lands. You see the result before anything changes.