Do I really need a GLP-1 app?

Honestly, no. A paper notebook with the date of every injection, the dose, side effects, weekly weight, and four lab snapshots a year is enough to manage a GLP-1 well. People have done it for decades. What a GLP-1 app adds is automation: dose reminders, side-effect patterns over months, lab values trended on charts, body composition layered next to weight, and a watch face that lets you log without picking up your phone. If you like notebooks, keep the notebook. If you want the trend lines drawn for you and the dose reminders to sit on the right day automatically, an app saves time. Phaze is free for the core tracking parts, so the cost of trying is zero.