Grapheal is a Medtech company focusing on electronic biosensors and wearables coupled to IoT and mobile technologies; producing high-quality sensing thin-films with Graphene-on-Insulator semiconducting layers that can be part of ultra-sensitive biosensors. The COVID-19 sanitary crisis has revealed the urgent need for low-cost and reliable diagnostic tools for rapid on-site screening of passengers. Grapheal is proposing a disposable low-cost and rapid diagnostic tests enabling multi-strain screening in saliva with an antibody-sensitized sensor coupled to a smartphone app.