Differin Gel is a once-a-day acne prescription-strength retinoid that you can purchase without a prescription. It treats the acne you already have and prevents new acne from forming. Meet the Clear90™ app. Track your 90-day journey to clear skin with the Clear90 app from Differin. This free app will coach you through every step of the process with several great features: Reminders: The Clear90 app includes daily reminders to help you keep on track by using Differin Gel every day, all over your face – as the key to clearer skin is consistent care. Tips and alerts: We know how frustrating acne can be. The Clear90 app will help keep you motivated on your journey to clear skin, so you understand how Differin Gel is working to improve your acne over the course of 90 days. For example, Differin Gel starts working in as little as two weeks. During this time, some people may experience a bit of dryness and irritation while their skin gets used to the retinoid. In case this happens to you, the Clear90 app can help guide you through it. Progress tracker: Use the Clear90 app to track your skin’s progress by taking a selfie every day and then utilize its time-lapse feature to see how much your acne has improved. Earn Rewards: The Clear90 app will reward your efforts with money-saving coupons.