Check In CBR is an application that enables you to access the COVID-19 contact tracing. You can also upload different files using this application like certificates, vaccination status, and more. Moreover, this is designed simple and user-friendly for you to easily go over the app without any challenges and issues. Lastly, you don't have to worry about anything because this is created for free because this does not require you to pay for subscriptions before downloading this on your chosen device.