The hour after a mirror session is a different hour from the rest of the day. The person is still in the room, or just leaving it. Skin is wet, or a towel is on the floor, or a resistance band is still looped on a chair. A companion-app message that names something from that session — “the left-shoulder set stopped at 4 of 8” — can be read. A generic “You were great today” is not read. We have watched people dismiss those while walking to the kitchen.
Timing is less a science than a courtesy. In one Ampang household the mirror session ended at 7:10 a.m. The bus left at 7:25. A summary that arrived at 7:18 was opened on the stairs. The same summary, when we asked the team to delay it for a “digestible moment” at 8:00, landed on a locked phone in a bag at the office and was cleared in a stack at lunch. The delayed version looked more thoughtful on a whiteboard. In the stairwell it was worse.
We also see messages that reopen an argument the household already had. A calorie line after a stretch the person did for a stiff back will be read as a lecture. If your companion app must send something, send the unfinished set, the photo they took, or nothing. Nothing is a legitimate after-session design. Several of the apps we studied improved their morning return rate when they stopped writing at 7:20 a.m.
Mirror Canvas Point does not A/B-test notification copy as a product. We sit with the hour after the session and write down whether the phone left the bathroom. That sentence is usually enough for a product meeting. If you want it in a brief, bring us a week of after-session messages and the households who received them — with their agreement, not from a silent log.