Thanks @DTS Engineer — that confirms what I was seeing. Filed the enhancement request: FB21947832 — "Add a vibration/haptic configuration option to AlarmKit AlarmManager.AlarmConfiguration." Per your suggestion I tested with different audio files (default, custom, near-silent) and with all user-level haptic preferences disabled: the system haptic pattern plays identically in every case, including in the AlarmKit sample project. So haptics are fully system-controlled with no developer or user opt-out for AlarmKit alarms. If anyone else needs sound-only alarms, duplicating the FB above would help prioritization. Thanks!