PTT Filateli is a free Android app developed by T.C. Posta ve Telgraf Teşkilati Genel Müdürlüğü, which is responsible for producing and selling postage stamps and philatelic materials in Turkey. The app allows users to browse and purchase stamps, as well as stay up-to-date with the latest philatelic news and events.

With PTT Filateli, users can search for stamps by year, theme, and collection, and view high-quality images of each stamp. The app also offers a variety of philatelic materials, including stamp albums, catalogs, and accessories.

In addition to its shopping features, PTT Filateli provides users with information on upcoming stamp exhibitions and events, as well as news and articles on the history and culture of stamp collecting.

Overall, PTT Filateli is a comprehensive app for both novice and experienced stamp collectors, offering a wide range of features and resources to enhance the philatelic experience.