myCOtrak is a self-report tool designed to collect data as part of the iCO research study. The iCO study is funded by the National Institute for Health and Care Research (NIHR) School for Primary Care Research (SPCR) and is run by the Universities of Nottingham and East Anglia. The iCO study aims to improve the support available to pregnant people who are trying to stop smoking, by investigating digital and remote solutions.