FastFlow: 16:8 Fasting Tracker

FastFlow tracks every hour of your fast. See fat burn, ketosis, and autophagy happen in real time. Describe a meal: AI tells you if it breaks your fast. Nobel Prize science. No login. No ads. Free to start.

THE METABOLIC TIMELINE
Your body changes every hour you fast. FastFlow's live timeline shows exactly which phase you are in and how long until the next. Tap any phase to read the clinical science behind it.

Phases tracked: Blood sugar drop, Early fat burn, Deep fat burn, Ketosis, Autophagy.

Based on: Ohsumi (Nobel Prize 2016), Anton et al. (Obesity 2018), Ho et al. (J Clin Invest 1988).

FASTING PROTOCOLS BUILT IN
16:8. 18:6. 20:4. OMAD. 5:2. Custom. Switch protocols any time. Your streak is protected by Streak Shields so one missed day does not destroy your progress.

INTERACTIVE iOS WIDGETS
See your fasting ring, elapsed time, and metabolic state on your Home Screen or Lock Screen without opening the app. On iOS 17 and later, start or stop your fast and log water directly from the widget.

CIRCADIAN ENGINE & QUALITY SCORE
FastFlow reads the time of day and adapts. Morning insights after waking. Midday hydration checks. Evening nudges to protect your eating window. Every completed fast gets a Quality Score from 0 to 100 based on duration, water logged, steps, and sleep. Watch it improve week over week.

AI MEAL ANALYZER
Describe your meal in plain text. FastFlow identifies ingredients, estimates your macros and calorie count, and rates the metabolic impact. Green: fasting-friendly. Amber: slows fat burn. Red: resets your fast. No barcode scanning. No database search. Just type and get your answer.

WATER & STEP TRACKER
Log water intake in seconds. FastFlow tracks your daily hydration goal against your body weight and warns you if dehydration is putting your fast at risk. No Apple Watch? FastFlow calculates steps and calories burned from your body weight and duration and logs directly to Apple Health.

YOUR AI COACH: 4 EXPERT PERSONAS
Each coach reads your last 7 days of data locally on your device.
• General Coach: Daily guidance based on streak, weight trend, and fast quality.
• IF Science Bot: Every answer is cited from published clinical research. It will not guess.
• Nutritionist: Meal timing and macro advice for your eating window.
• App Guide: Instant answers about any FastFlow feature.

APPLE HEALTH INTEGRATION
FastFlow reads and writes steps, active calories, resting heart rate, sleep, and weight. Medical-grade citations appear next to every stat so you understand what each number means for your weight loss and BMI goals.

STORY STUDIO
Turn your streak into shareable content. A built-in card creator lets you share your fast to Instagram or WhatsApp in one tap. AI generates the caption from your real data: streak days, quality score, and weight lost.

ANONYMOUS COMMUNITY
Every member gets a generated animal handle, like Silent Falcon or Bold Tiger, so your identity stays private. Join channels for Beginners, Science, Women's Health, Food, and Tips. React, reply, stay accountable. No social login required.