Nothing is tracked here. The Angelus has no progress to keep — only these display settings are remembered, and only on this device.
Three verses on the angel's message to Mary and her answer to it, each with a Hail Mary, then a short prayer. For centuries a church bell rang the hours so a whole town stopped at the same moment.
Church bells used to ring three times a day — morning, noon, evening — and everyone within earshot stopped whatever they were doing and said this. In the fields, in the shop, at the table. Millet painted it: two farmers standing in a potato field with their heads down, because the bell had gone.
What the prayer does is small and specific. It states the Incarnation three times, in three lines, and asks for grace on the strength of it. That is all. It takes about as long as reading a text message.
The point is not the minute. It is that three times a day something interrupts you and the interruption is not your phone.
This site sends no notifications and never will. If you want a prompt at six, noon and six, set three repeating alarms on your phone — that is the whole mechanism, it belongs to you, and nothing here needs to know about it.