I built Perks Reminder , a free open-source app for tracking credit card benefits, recurring credits, welcome bonus deadlines, annual fee ROI, and loyalty expirations. The product problem is simple: recurring benefits are calendar problems. A monthly dining credit, an annual hotel credit, a signup bonus deadline, and a points expiration date all need different reminder behavior. They are not hard to track individually, but they become annoying once you have enough of them. Live app: ...