one sec Limit Screen Time is a free productivity app developed by riedel.wtf GmbH for iPhone users. Unlike other screen time tools, one sec doesn't block access to apps and websites, but it delays access to them. This app aims to help users fight social media algorithms and regain control over their phone usage and subconsciousness. The effectiveness of one sec has been confirmed in a peer-reviewed scientific study conducted by Max-Planck Institute and Heidelberg University, where app usage drops by an average of 57%.

one sec uses Shortcuts Automation to toggle a deep breath animation whenever users open any of the configured apps, such as Instagram, Twitter, or YouTube. This helps break unconscious social media habits in the short-term and adds more friction when opening these apps in the long-term. With this app, users can reflect on their actions, thoughts, and feelings, and disrupt harmful social media habits with mindfulness.

Moreover, one sec contributes mindful moments to the Health App via HealthKit. The app offers one sec pro, an annual, monthly, or lifetime unlock subscription option.