The present study explored the generation and retrieval practice effects within a college classroom using a free, online tool called PeerWise (PW). PW allows students to create their own multiple-choice questions, share them with peers, and answer the shared questions written by their peers. Forty students from two sections of an upper level cognitive psychology course authored and answered multiple-choice questions as part of a semester-long assignment. Analyses showed reliable generation and retrieval practice effects following PW usage, along with a significant improvement in exam performance.