Proshoper is a free iPhone app developed by Konstantin Akinin that serves as a guide to promotions and marketing campaigns of major retail chains in Russia. With this app, users can browse through catalogs of deals offered by popular retailers such as Perekrestok, Pyaterochka, Karusel, Dixy, Billa, Metro, Sedmoi Kontinent, Nash Gipermarket, Okey, Lenta, Magnit, Metro, Monetka, Vernyi, Victoria, and more.

This app is a convenient tool for finding discounted products in stores near your location. With just a few taps, users can easily discover which store is offering a particular item at a discount of up to 50% or even more. The app provides online access to the catalogs, allowing users to view them and even download them in PDF format. Additionally, users can search for specific pages within the catalogs.