A loop is one day: your moment, the habit, and ten seconds saying how it went. Small enough to close on a bad day — which is the only reason it works.
You set up one habit and the moment it follows. Nothing else competes with it, and the next one waits until this one is steady.
Every habit gets a small version you can do when the day falls apart. It isn't a lesser day — the repetition is what builds the habit, and this is what keeps it going.
When something keeps getting in the way, the app says what it noticed and suggests a change — a smaller size, a different moment. Nothing changes until you agree to it.
Nothing to break, and nothing to lose on the day you miss. The only question it answers is whether this is getting easier than it was.
What you write stays on your phone. The habit, your notes and your answers are kept on the device. The app does report anonymous usage counts — whether setup finished, whether a suggestion was accepted — and never a word you wrote. The privacy policy lists what that covers.
On newer iPhones, the phrasing is done on the device — and it is only the phrasing. What the app suggests comes from your own answers.