Family Affair, developed by Slimming World Ltd., is a free lifestyle app available on iPhone. The app promotes a flexible, family-friendly approach to healthy eating and exercise. It aims to simplify meal planning by offering everyday food and activity suggestions that cater to the whole family's needs.

Members of Slimming World can utilize their membership number and PIN to unlock exclusive features within the Family Affair app. These features include family-friendly recipes, tips, food swaps, and activity ideas that can be shared with children at home. By focusing on healthy foundations for life, Family Affair encourages a holistic approach to well-being for the entire family.