Online Tennis Instruction (OTI) is a free iPhone app under the Lifestyle category, specifically catering to Sports enthusiasts. Users can access courses online or download them for offline viewing. One of its standout features includes the ability to effortlessly record a video of your tennis stroke directly within the app and conveniently send it with just a few clicks.

OTI simplifies the process of improving your tennis skills by providing easy access to instructional content and enabling users to capture and share their gameplay for feedback or analysis. With a user-friendly interface, this app aims to enhance the learning experience for tennis enthusiasts of all levels.