Signal Garden tracks DAU (Daily Active Users: 15), WAU (Weekly: 32), and MAU (Monthly: 68). DAU is the north star metric — it measures daily engagement habit. The ratio DAU/MAU (15/68 = 22%) is a stickiness metric: what percentage of monthly users come back daily. 22% is decent for a new product — it means roughly 1 in 5 monthly users is a daily user. Improving this ratio is GPT-5.5's core challenge: make the product sticky enough that monthly users become daily users.