SignInSafe is an innovative online platform that enables contactless digital sign-in for visitors and guests via QR codes. This versatile tool is applicable in various scenarios where sign-in or sign-out is necessary. It is particularly useful for managing visitor logs at construction sites, creating guest lists or waitlists for restaurants, assisting with COVID-19 tracing, facilitating student and visitor check-ins at schools, and organizing drop-off and pick-up processes for sports activities. The entire system is conveniently managed through cloud technology, ensuring that neither customers nor visitors need to download any applications to utilize its features. Additionally, SignInSafe enhances the efficiency of visitor management by streamlining processes and improving record-keeping.