The TogetherCARE™ app is a tool for study teams researching clinical trial participants’ primary informal caregivers. Informal caregivers are vital sources of safety information and heavily influence whether patients remain in clinical trials. These informal caregivers are a wealth of information regarding the patients safety such as their symptom development which can ultimately lead to adverse events and trial drop out. The TogetherCare site app gives study teams a tool to gather data about clinical trial participants.