Objectives: Carers of people with dementia face barriers in accessing therapy for mental health difficulties. Computerised cognitive behavioural therapy (cCBT) packages can be effective in treating a range of presentations; however, tailored packages for carers' unique needs are lacking. Our aim was to design a cCBT package for carers to address the limitations of previous online interventions, by including users and experts as consultants and collaborators throughout the project. Method: We adopted a three-phase approach to the development process.