title: The feasibility and effectiveness of Catch It, an innovative CBT smartphone app.
abstract: BACKGROUND
  The widespread use of smartphones makes effective therapies such as cognitive-behavioural therapy (CBT) potentially accessible to large numbers of people.
  
  
  OBJECTIVE
  This paper reports the usage data of the first trial of Catch It, a new CBT smartphone app.
  
  
  METHODS
  Uptake and usage rates, fidelity of user responses to CBT principles, and impact on reported negative and positive moods were assessed.
  
  
  RESULTS
  A relatively modest proportion of people chose to download the app. Once used, the app tended to be used more than once, and 84% of the user-generated content was consistent with the basic concepts of CBT. There were statistically significant reductions in negative mood intensity and increases in positive mood intensity.
  
  
  CONCLUSIONS
  Smartphone apps have potential beneficial effects in mental health through the application of basic CBT principles. More research with randomised controlled trial designs should be conducted.
  
  
  BACKGROUND
  None.
  © The Royal College of Psychiatrists 2016. This is an open access article distributed under the terms of the Creative Commons Non-Commercial, No Derivatives (CC BY-NC-ND) licence.
authors.affiliation: , MA, MSc, PhD, Institute of Psychology, Health and Society, University of Liverpool, Liverpool, UK.
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