SOL vs FastOn

SOL (솔) — 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's actually happening inside your body — in real time. As you fast, SOL guides you through each biological phase: Fed State → Insulin Dropping → Fat Burning → Ketosis → Autophagy → Deep Autophagy → Growth Hormone Surge → Immune Reset FEATURES • Beautiful minimal timer with progress ring • Real-time body phase updates with scientific sources • Full body timeline — see all 8 phases and your progress • Tap any phase for in-depth science and PubMed sources • Smart notifications at each milestone • Stats dashboard — track your fasting journey • Background timer — keeps running when you close the app • Light & dark mode with handcrafted watercolor textures • Home screen widget • Community pulse — you're not fasting alone • Share your results with a beautiful card FASTING GOALS Choose from 16h, 18h, 20h, 24h, 36h, 48h, 72h, or go Open with no time limit. Hit your goal? Extend to the next level. DESIGNED WITH INTENTION SOL is inspired by the simplicity of nature. No clutter, no ads, no unnecessary features. Just you, your fast, and the knowledge of what your body is doing. All body phase information is based on peer-reviewed scientific research with direct links to PubMed sources. 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.