FastFlex: Smart Fasting
Contains ads
Everyone
info
10+
Downloads
Everyone
Learn more
About this app
FastFlex is an intermittent fasting timer designed to respect you. Every fasting protocol stays free forever, the coach voice is encouraging (and dial-down-able), and your data stays on your phone.
This app is not a medical device and does not diagnose, treat, cure, or prevent any condition. FastFlex provides general educational content about intermittent fasting. Consult a qualified healthcare provider before starting any fasting regimen, especially if you are pregnant, breastfeeding, under 18, or have a medical condition.
GROUNDED IN RESEARCH
FastFlex is built on a review of 40+ scientific sources on fasting metabolism, ketosis, and time-restricted eating. The metabolic phases and the Cell Repair Score are honest, estimated proxies based on that evidence, not measured medical readings.
WHY FASTFLEX
- All fasting protocols are free, forever. No protocol is ever paywalled, including the full custom-plan builder.
- Personalised to you. Your metabolic phase timings adapt to your carb intake, activity, age, and gender, so the phases reflect your body rather than a generic chart.
- No paywall in onboarding, no nagging.
- Local-first by design. Your fasting history and settings live only on your device. We collect no personal data and have no servers.
- Calm, modern design. The timer is sacred.
FEATURES
- Beautiful live timer with a progress ring and projected end time.
- Personalised Phase Lanes: watch yourself move through Digesting, Sugar-burning, Fat-burning, Ketosis, and Autophagy, with thresholds tuned to you. Tap any phase to learn what is happening in your body.
- Cell Repair Score: an honest, estimated A-F signal of how strong and consistent your fasting practice is, with a clear explainer of what it means and how to optimise it.
- Repair and energy section: see the energy you burn during a fast and a smoothed weight trend over time, with honest insights and no food logging required. Movement from steps and quick logged exercises (push-ups, squats, stretching) pulls your phase lines earlier.
- Optional pre-fast check-in: a two-tap log of carbs, sleep, stress, and body metrics that personalises your score and tracks outcomes over time.
- Plans built in: 16:8, 14:10, 18:6, 20:4, OMAD, longer fasts (24h, 30h, 36h), an open-ended option, plus a full custom-plan builder.
- Optional reminders: a gentle alert when your fast completes, plus opt-in metabolic-milestone and long-fast check-in notifications. You choose what fires.
- Editable fast records and a friendly result screen. Forgot to start the timer? Adjust it. Ended early? "Kind work for showing up." Then Edit or Resume.
- Real Calendar of your fasts: view, edit, add a past fast you did off-app.
- Real Trends: best streak, completion %, averages, weekly deep-fast time, your weight trend, and your Cell Repair Score over time.
- Coach tab: bite-sized education and research-backed picks (clearly tagged Fasting-safe vs Eating-window).
- Forgiving streaks. A missed day never erases your best run.
- Coach dial: Full / Light / Off. Encouragement is yours to control.
- Light, Dark, or System theme.
- Accessibility-first: semantic labels, reduced-motion support, screen-reader friendly.
This app is not a medical device and does not diagnose, treat, cure, or prevent any condition. FastFlex provides general educational content about intermittent fasting. Consult a qualified healthcare provider before starting any fasting regimen, especially if you are pregnant, breastfeeding, under 18, or have a medical condition.
GROUNDED IN RESEARCH
FastFlex is built on a review of 40+ scientific sources on fasting metabolism, ketosis, and time-restricted eating. The metabolic phases and the Cell Repair Score are honest, estimated proxies based on that evidence, not measured medical readings.
WHY FASTFLEX
- All fasting protocols are free, forever. No protocol is ever paywalled, including the full custom-plan builder.
- Personalised to you. Your metabolic phase timings adapt to your carb intake, activity, age, and gender, so the phases reflect your body rather than a generic chart.
- No paywall in onboarding, no nagging.
- Local-first by design. Your fasting history and settings live only on your device. We collect no personal data and have no servers.
- Calm, modern design. The timer is sacred.
FEATURES
- Beautiful live timer with a progress ring and projected end time.
- Personalised Phase Lanes: watch yourself move through Digesting, Sugar-burning, Fat-burning, Ketosis, and Autophagy, with thresholds tuned to you. Tap any phase to learn what is happening in your body.
- Cell Repair Score: an honest, estimated A-F signal of how strong and consistent your fasting practice is, with a clear explainer of what it means and how to optimise it.
- Repair and energy section: see the energy you burn during a fast and a smoothed weight trend over time, with honest insights and no food logging required. Movement from steps and quick logged exercises (push-ups, squats, stretching) pulls your phase lines earlier.
- Optional pre-fast check-in: a two-tap log of carbs, sleep, stress, and body metrics that personalises your score and tracks outcomes over time.
- Plans built in: 16:8, 14:10, 18:6, 20:4, OMAD, longer fasts (24h, 30h, 36h), an open-ended option, plus a full custom-plan builder.
- Optional reminders: a gentle alert when your fast completes, plus opt-in metabolic-milestone and long-fast check-in notifications. You choose what fires.
- Editable fast records and a friendly result screen. Forgot to start the timer? Adjust it. Ended early? "Kind work for showing up." Then Edit or Resume.
- Real Calendar of your fasts: view, edit, add a past fast you did off-app.
- Real Trends: best streak, completion %, averages, weekly deep-fast time, your weight trend, and your Cell Repair Score over time.
- Coach tab: bite-sized education and research-backed picks (clearly tagged Fasting-safe vs Eating-window).
- Forgiving streaks. A missed day never erases your best run.
- Coach dial: Full / Light / Off. Encouragement is yours to control.
- Light, Dark, or System theme.
- Accessibility-first: semantic labels, reduced-motion support, screen-reader friendly.
Updated on
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.
