Background:
Researchers have used mobile phones to assist in monitoring, analysing, and managing moods to acquire insight into mood patterns. There is a lack of evidence in their use as clinical tools and interventions, which necessitates a comprehensive review and quality assessment to understand barriers and facilitators for app implementation as an impactful clinical intervention.

Objective:
This review aims to (1) provide an overview of the recent evidence on mobile mood monitoring applications that are intended for facilitating self-management and support of mental health in children, adolescents, and young people; (2) investigate the quality of publicly available apps.

Methods:
The study will first involve a scoping review of the literature on mood monitoring apps for children, adolescents, and young people followed by an evaluation of features of the apps available in the marketplace. The scoping review will follow the Preferred Reporting Items for Systematic Reviews and Meta-Analyses Extension for Scoping Reviews guidelines and search six databases: Embase, CINAHL, PubMed, ACM Digital Library, Scopus, and Springer LNCS for relevant studies and reviews published in the last three years. The author will then screen the references, extract data from the included studies, and analyse them to synthesise the evidence on mood apps. Next, the Apple App Store and Google Play Store will be searched for mood apps. Two independent reviewers will screen the apps based on eligibility criteria and disagreements will be resolved via consensus. The features of the selected apps will then be evaluated using the M-Health Index and Navigation framework, and descriptive analysis will be used to synthesise the findings.

Results:
Literature search and screening began soon after submission of the protocol and is expected to be completed by August 2024. The app evaluation will be completed by September 2024.

Conclusions:
Combined, the scoping literature review and app evaluation will provide an in-depth overview of the most recent scientific evidence related to mood apps and the quality of apps actually available for use.

Ethics and dissemination:
No ethical approval is required as exclusively secondary data will be used.