Calm Harm is an app designed to assist individuals in managing feelings of self-harm, offering a valuable tool for both adults and children over 11 years old. Calm Harm utilises techniques founded on dialectical behaviour therapy (DBT) to provide users with effective strategies for managing distressing emotions. The app employs breathing techniques alongside various activities specifically aimed at distracting and comforting the user, helping to break the cycle of self-harm. Calm Harm is highly personalised, catering to the unique needs of each user. Through the app, users can access a range of specialised activities customised to their requirements. Additionally, a health diary is provided so users can keep track of their progress, offering insights into their mental health journey and identifying patterns or triggers. In situations where immediate help is required, Calm Harm includes a crisis zone feature to provide urgent assistance. This accessibility ensures that support is available at critical moments, helping to manage the intensity of self-harming urges. Created with the expertise of a consultant clinical psychologist and supported by evidence-based research, Calm Harm is grounded in scientific principles. The app’s design reflects a deep understanding of the challenges faced by those experiencing self-harm tendencies, making it a reliable and trustworthy resource. Calm Harm is free to download and use, removing financial barriers to accessing vital mental health support. By offering a free and effective solution, Calm Harm makes mental health support accessible to a wider audience, helping individuals manage their self-harm inclinations with the right tools and guidance. To further enhance its usability, Calm Harm is available on multiple platforms, including the Apple App Store and Google Play Store. Whether accessed via an iPhone or Android device, Calm Harm ensures seamless support for users seeking to improve their mental wellbeing. Overall, Calm Harm stands as a crucial app for anyone struggling with self-harm by providing personalised, specialised, and individualised support. With its comprehensive approach to mental health support, Calm Harm is an essential tool for managing self-harm urges and improving overall mental health.