QR Cheсk-In is a free Android app developed by ОООМАРС that aims to help users scan QR codes, check the validity of the encoded links, and mark entries for various reasons. The app also allows for registration of mobile app operators using their Taxpayer Identification Number (TIN) and verification of TIN and OKVED against the Federal Tax Service database. Additionally, the app generates reports on scanning activity.

With QR Cheсk-In, users can quickly and easily scan QR codes to ensure the authenticity of the source and access the information encoded in them. The app also provides a convenient way to track entries for different purposes, such as attendance, visitor logs, and more. Furthermore, the app's registration feature ensures that only authorized operators can use it, and the verification of TIN and OKVED adds an extra layer of security.

Overall, QR Cheсk-In is a useful tool for businesses and organizations that need to manage entries and scan QR codes regularly. It is a straightforward and reliable app that can save time and effort in these tasks.