Gluten Free Scanner is a passive ASO-driven utility app in the evergreen gluten-free/celiac niche. It has generated $5,810+ since launch, currently doing ~$470 MRR and $750+ in the past 30 days, with 95%+ margins and only ~$2–3/month in AI costs. It ranks top 10 in the US and top 5 in Canada, Germany, and other countries despite no updates in 11 months. Built in Expo React Native, with upside via localization, Android launch, paid ads, UGC, and ASO.