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Beacon Baby is a one-handed iPhone app for tracking a baby's bottle feeds, nursing, diaper changes, and sleep. Its written design brief is a single sentence — "one hand, 3am, baby in the other arm, lights off" — and every decision in the app serves it: targets are sized for a thumb, confirmation is a haptic rather than a dialog, and any log can be undone in one tap from the undo strip that confirms it. A feed can be logged with one tap, because the button arrives pre-loaded with the amount you usually give at that hour, computed from your own history by plain arithmetic. It can also be logged by voice, in the app or through Siri, without looking at the screen.

Beacon Baby keeps the log on the device by default. There is no analytics and no advertising SDK, and until sharing is turned on the app contacts nothing when it launches — a launch-time request would emit a timestamped record of when a household is awake at 3am. Families that want one log across everyone's phones can switch on sharing, which is free and off until turned on; it requires an account, copies entries to a database isolated per household at the database level, and never syncs photos. Beacon Baby reports what was logged and never interprets it: there are no thresholds, no alert states, and no percentile or verdict attached to any number. It is a log, not a monitor.