I believe Sensa is a scam site. There are several problems. They take a lot of personal info, they do not show any registered address on their website, the founder has no surname, they attribute the brains of the app to a psychotherapist in Lithuania called Dainius Jakučionis MD, whose linked description mentions nothing about Sensa and his qualifications are not as an MD as they claim. They trick you into a minimum of 3 month subscription and you have to give them 2 days notice to cancel. You receive a message that Dainius Jakučionis has personally reviewed the answers to your quiz. They offer unsubstantiated statistics for how their app can improve your life with ADHD. I believe this is a cleverly workout scam, preying on people who might struggling to track and protect themselves from recurring billing, due to having ADHD. I have reported them to the Federal Trade Commission.