FC2Video Viewer is a multimedia application developed by FC2 Inc. for iPhone users. The app aims to provide users with a seamless experience to watch purchased videos and albums from FC2. It offers features such as syncing account information between smartphone and PC, video quality selection, detailed search (for paid members), viewing history, album creation, follow feature, passcode lock, secret mode, and double speed playback.

Users can opt for a premium membership to access additional benefits such as detailed search, high-quality video streaming, and more. The subscription plans include a monthly renewal option and an annual purchase option. The app also provides clear instructions on managing subscriptions and canceling automatic renewals through the iTunes account settings.