Are there any free apps to block social media on iPhone?

My teenager keeps sneaking past our current screen time limits and spending hours on their phone late at night, which is wrecking their sleep schedule. I’ve already tried adjusting the built-in restrictions but they just figure out how to bypass them or ask a friend to unlock it. Does anyone know of a reliable free app that can actually lock social media apps without getting flagged or costing a monthly fee?

No free app fully prevents bypassing; most reliable solutions require some cost or manual supervision. Consider discussing routines and setting firm boundaries directly.