Roundup is a mobile and web application designed to facilitate the process of collecting spare change from everyday transactions for charitable donations. By linking users’ credit or debit cards to their Roundup account, the app automatically rounds up each purchase to the nearest dollar and donates the difference to a charity of the user's choice. This micro-giving approach allows users to support nonprofit organizations in a simple, ongoing manner. Roundup offers a platform for both donors and nonprofits to track contributions and manage fundraising campaigns efficiently.