3CTim哥 x OLi嚴選 is an Android app by 91APP Inc. 17 designed for tech enthusiasts who love fashion and cuteness. The app provides a wide range of technology products, peripheral accessories, and small objects for review and purchase. The program name is inspired by two of the app's creators, 3CTim哥 and OLi, who curate and recommend products on a weekly basis.

One of the app's main features is the easy-to-use interface that lets users browse and purchase products with a simple swipe. The app also includes interesting video reviews by 3CTim哥, who provides straightforward and understandable product demonstrations. Additionally, users can enjoy the OLi Corgi Diary Book, where they can follow OLi's adventures and daily life. The app also offers reminders when products are shipped or ready to be picked up, as well as instant notifications about promotions and discounts. Users can join the app as members by using their Facebook account or phone number and can pay with credit cards or through convenience stores.