FastZen: Intermittent Fasting
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About this app
Cultivate mindful discipline and optimize cellular longevity with FastZen — an elegant, science-backed intermittent fasting tracker designed without distraction.
FastZen pairs precise circadian timekeeping with an animated Living Metabolic Bio-Engine, visualizing your physiological transition from digestion to fat burning and cellular autophagy in real time.
KEY FEATURES
• Living Metabolic Bio-Engine
Witness your cellular energetics transition across 5 physiological horizons:
1. Digestion & Blood Sugar Normalization (0h – 4h): Post-meal glucose stabilization.
2. Glycogen Depletion & Insulin Drop (4h – 8h): Digestive rest as liver reserves are tapped.
3. Metabolic Switch & Fat Oxidation (8h – 12h): Fuel crossover from carbohydrates to lipid burning.
4. Nutritional Ketosis (12h – 16h): Elevated ketones and primary stored body-fat burn (up to 90%).
5. Deep Autophagy & Cellular Renewal (16h – 24h+): Intracellular lysosomal clean-up and repair.
• Precision Fasting Protocols
Choose the circadian rhythm that fits your lifestyle:
- 16:8 LeanGains: The gold standard for daily metabolic health and sustainable fat loss.
- 18:6 Intermediate: Extended fat oxidation and afternoon feeding window.
- 20:4 Warrior: Deep evening satiety with amplified autophagy priming.
- 14:10 Gentle: Gradual introduction for beginners establishing a daily rhythm.
- 12:12 Circadian Balance: Natural sunset-to-sunrise biological rest.
- Custom Protocol: Fully adjustable targets for experienced practitioners.
• Dual-Fuel Partitioning Gauges
Understand your exact biological fuel balance (Carbohydrates vs. Stored Body Fat) in every zone, accompanied by evidence-based hydration advice and biomarker expectations.
• Tactile & Acoustic Mindfulness
Gentle, low-amplitude haptic pulses acknowledge milestones, complemented by an optional meditative Zen bowl gong when your fasting goal is reached.
• Warm Day & Evening Palette
Experience the soothing Claude Warm Cream aesthetic during daylight hours and seamlessly transition to low-eyestrain Warm Charcoal at night. No harsh blue light or glowing neon.
• Complete Data Sovereignty & Local Privacy
FastZen operates entirely on your device:
- 100% Local Storage: Your fasting history never leaves your phone.
- Zero Cloud Tracking: No accounts, no passwords, no servers.
- Zero Telemetry: No third-party analytics or advertising SDKs.
- Portable Exports: 1-tap backup and export to CSV or JSON anytime.
MEDICAL SAFETY ADVISORY
FastZen is designed for healthy adults seeking a mindful lifestyle companion. Fasting is NOT recommended for:
- Individuals under 18 years of age
- Women who are pregnant or nursing
- Individuals with a current or prior history of eating disorders
- Individuals with Type 1 Diabetes or those taking prescribed hypoglycemic medications
- Individuals who are clinically underweight (BMI < 18.5)
Always consult your healthcare physician before initiating an extended fasting regimen.
FastZen pairs precise circadian timekeeping with an animated Living Metabolic Bio-Engine, visualizing your physiological transition from digestion to fat burning and cellular autophagy in real time.
KEY FEATURES
• Living Metabolic Bio-Engine
Witness your cellular energetics transition across 5 physiological horizons:
1. Digestion & Blood Sugar Normalization (0h – 4h): Post-meal glucose stabilization.
2. Glycogen Depletion & Insulin Drop (4h – 8h): Digestive rest as liver reserves are tapped.
3. Metabolic Switch & Fat Oxidation (8h – 12h): Fuel crossover from carbohydrates to lipid burning.
4. Nutritional Ketosis (12h – 16h): Elevated ketones and primary stored body-fat burn (up to 90%).
5. Deep Autophagy & Cellular Renewal (16h – 24h+): Intracellular lysosomal clean-up and repair.
• Precision Fasting Protocols
Choose the circadian rhythm that fits your lifestyle:
- 16:8 LeanGains: The gold standard for daily metabolic health and sustainable fat loss.
- 18:6 Intermediate: Extended fat oxidation and afternoon feeding window.
- 20:4 Warrior: Deep evening satiety with amplified autophagy priming.
- 14:10 Gentle: Gradual introduction for beginners establishing a daily rhythm.
- 12:12 Circadian Balance: Natural sunset-to-sunrise biological rest.
- Custom Protocol: Fully adjustable targets for experienced practitioners.
• Dual-Fuel Partitioning Gauges
Understand your exact biological fuel balance (Carbohydrates vs. Stored Body Fat) in every zone, accompanied by evidence-based hydration advice and biomarker expectations.
• Tactile & Acoustic Mindfulness
Gentle, low-amplitude haptic pulses acknowledge milestones, complemented by an optional meditative Zen bowl gong when your fasting goal is reached.
• Warm Day & Evening Palette
Experience the soothing Claude Warm Cream aesthetic during daylight hours and seamlessly transition to low-eyestrain Warm Charcoal at night. No harsh blue light or glowing neon.
• Complete Data Sovereignty & Local Privacy
FastZen operates entirely on your device:
- 100% Local Storage: Your fasting history never leaves your phone.
- Zero Cloud Tracking: No accounts, no passwords, no servers.
- Zero Telemetry: No third-party analytics or advertising SDKs.
- Portable Exports: 1-tap backup and export to CSV or JSON anytime.
MEDICAL SAFETY ADVISORY
FastZen is designed for healthy adults seeking a mindful lifestyle companion. Fasting is NOT recommended for:
- Individuals under 18 years of age
- Women who are pregnant or nursing
- Individuals with a current or prior history of eating disorders
- Individuals with Type 1 Diabetes or those taking prescribed hypoglycemic medications
- Individuals who are clinically underweight (BMI < 18.5)
Always consult your healthcare physician before initiating an extended fasting regimen.
Mindful intermittent fasting, cellular metabolic stages & circadian rhythms.
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Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
- No data shared with third partiesLearn more about how developers declare sharing
- No data collectedLearn more about how developers declare collection
What’s new
Initial release of FastZen: Mindful intermittent fasting with living metabolic bio-engine.
