SummRules is a simple beach day companion designed to help you spend time in the sun more mindfully and remember basic safety around water. The app combines a sun exposure timer, sunscreen reapplication reminders, and a practical offline guide with clear tips for beach situations. To estimate a suggested sun session, choose your Fitzpatrick skin type, SPF level, and current UV index. SummRules then shows an easy-to-read session time while accounting for the fact that sunscreen is not always applied perfectly in real life. The goal is not to replace expert advice, but to give you a clearer way to plan your time outdoors. At the center of the app is a large timer with a live progress ring. It helps you follow how long you have been in the sun, warns when the session is close to ending, and reminds you when it may be time to reapply sunscreen or move into shade. After reapplying, tap Reapply Sunscreen to start a fresh countdown. SummRules is also useful beyond tanning time. Inside the app, you will find an offline beach safety guide with short, practical explanations of common risks such as rip currents, strong waves, storms, jellyfish, sharks, debris in the water, collapsing sand holes, harmful algae, and high UV levels. The information is written in clear language so you can quickly understand what to watch for. The app also includes quick first aid scenarios for typical beach emergencies. You can review what to do in situations such as sunburn, heat exhaustion, heat stroke, jellyfish stings, rip currents, drowning risk, or CPR awareness. The guidance focuses on calm, practical steps and also explains actions that are better to avoid. SummRules is based on recognized safety and health information sources, including NOAA, WHO, Mayo Clinic, American Red Cross, and Fitzpatrick MED research. It does not replace a doctor, lifeguard, emergency service, or professional medical care. Instead, it helps you stay more aware, make safer choices, and avoid relying on random advice when you need quick orientation. The warm visual style uses soft colors, sun, waves, and a hand-drawn feeling to make the app friendly and easy to use. There are no complicated medical formulas, no registration, and no need to collect personal data. Open SummRules before going to the beach, set your basic parameters, and let the app help you organize your time under the sun in a calmer, clearer way.