Чердак is a free app developed by LoyaltyPlant for Android devices. It falls under the category of Lifestyle and subcategory of Shopping. The app offers a rewards program for customers who visit the cafe and make purchases. By presenting their bonus card during each visit, customers can accumulate points that can be redeemed for gifts. The first gift is a homemade lemonade which can be claimed on the next visit.

Чердак has two cafes in Saint Petersburg, one near the Narvskaya metro station and the other between Gorkovskaya and Ploshchad Lenina. Although the cafes have similar styles, they differ in their assortment of products and prices. The app does not provide any contact information for the developer or any option to provide feedback or suggestions.

The app also displays the working hours of both cafes. The cafe located on Kuybysheva street is open from 12:00 to 23:30 from Sunday to Thursday and from 12:00 to 02:00 on Friday and Saturday. The cafe on Staro-Petergofsky prospect is open from 11:00 to 23:30 from Sunday to Thursday, from 12:00 to 01:00 on Friday, and from 12:00 to 23:30 on Saturday.