SOL vs FastOn

SOL (솔) is Korean for pine tree. Like the pine that endures through every season, SOL stands with you through every fast. WHAT MAKES SOL DIFFERENT Most fasting apps just show a timer. SOL shows you what is happening inside your body as the hours pass, with the research behind it. As you fast, SOL guides you through eight phases: Fed State, Insulin Dropping, Fat Burning, Ketosis, Autophagy, Deep Autophagy, Growth Hormone Surge and Immune Reset. FEATURES • A calm timer with a progress ring and phase markers • Your fast on the lock screen and in the Dynamic Island • All 8 phases explained, with links to the published studies • A goal dial from 12 to 72 hours, or an open fast with no limit • Started earlier? Set the time you last ate, and correct it later • Switch the timer between time elapsed and time to go • A daily reminder to start your fast • Your Journey: stats, streaks, a 7 day view and your history • Edit, add or delete past fasts • Guidance on breaking your fast gently • Home screen widget • "Start my fast" with Siri • Share your results with a beautiful card • Light and dark mode with handcrafted watercolor textures FASTING TOGETHER If you like, join the live count of people fasting right now. It is optional, anonymous and off until you turn it on. YOUR DATA No account, no ads, no tracking. Your fasting data stays on your device unless you choose to join the community count or turn on iCloud backup. DESIGNED WITH INTENTION SOL is inspired by the simplicity of nature. No clutter and no paywall. Just you, your fast, and a clearer picture of what your body is doing. SOL is free. If you enjoy it, you can leave a tip. ABOUT THE SCIENCE Phase information is based on peer-reviewed research, with direct links to the sources. Some findings come from animal studies, and every body responds differently. SOL offers general wellness information and is not medical advice. Please talk to a doctor before fasting, especially for longer fasts. Begin your fast. Know your body. Grow like the pine.

A fasting timer that lets you see what's happening inside your body — even without opening the app. FastOn helps you keep a 16-hour intermittent fast with a clean, focused timer. It works fully offline, needs no account, and keeps all your data on your device. VISUALIZE YOUR FAST As time passes, FastOn shows what's happening inside your body in real time: Digesting → Blood sugar → Fat burning → Ketosis → Autophagy → Growth hormone → Deep repair It's not just a countdown — knowing "fat burning starts soon" is what keeps you going. Tap any stage to learn the science behind it and what benefits to expect. FREE FEATURES - Start/stop a fast in one tap (backdate from your last meal) - Circular timer + real-time body stage - 16:8 plan - Streak tracking - Last 7 days of history - Water intake tracker - Mood & energy self-logging - Confetti celebration + SNS share card on completion PREMIUM - All plans (18:6 / 20:4 / OMAD / 5:2 / Custom) - Home screen Widget + Live Activity (remaining time & stage on Lock Screen and Dynamic Island) - Full statistics + insights - AI Advice (personalized tips based on your fasting patterns) - Weight tracking + goal weight line + HealthKit - 20 badges / achievements with categories - CSV data export - Eating window end & streak crisis notifications - No ads NOTE This app does not provide medical advice. Body-stage information is a general guideline based on common scientific knowledge and varies by individual. If you have a medical condition or are pregnant, please consult your doctor. SUBSCRIPTION - Monthly ¥480 / Yearly ¥2,900 (yearly includes a 7-day free trial) - Payment is charged to your Apple ID at confirmation. - It renews automatically unless auto-renew is turned off at least 24 hours before the end of the period. - Manage or cancel in Settings > Apple ID > Subscriptions. Terms of Use and Privacy Policy are available in the app settings and from the store links.