I know, I was afraid of the scale, too. But per the Noom plan, you weigh in every day to track your weight-loss progress. Of course, any movement on the scale day to day can be a reflection of other factors at play besides fat loss: water retention, eating too much sodium the night before, or being on your period, just to name a few.
But weighing in every day and looking at the chart has really helped me stay on top of my plan. Weighing in weekly could be so discourageing because I had no idea what happened from one week to the next. Although my weight does go up and down (especially if I had too many cocktails the night before), it's nice to see the general trend downwards on the chart in the app.