Fasting that works with your body, not against it.
Fastara adapts your fasting windows, food suggestions, and movement recommendations to every phase of your menstrual cycle — so you work with your body, not against it.
Your cycle changes everything. Fastara keeps up.
Log your cycle
Enter your last period date and cycle length. Fastara calculates your current phase automatically.
Get phase-aware guidance
Receive personalized fasting windows, food suggestions, and workout plans that shift with your hormones.
Track & learn
Log symptoms, monitor fasting streaks, and explore a library of science-backed articles about your body.
Everything your body needs, in one app.
Cycle-Synced Fasting
Personalized fasting windows from 12:12 to 18:6 that shift with your hormones. Extended fasting options up to 72 hours with safety guidance. Evidence citations so you understand the science behind every suggestion.
Smart Fasting Timer
A beautiful, phase-colored timer with real-time progress tracking. Choose from multiple fasting protocols each day. Track streaks and always know when your eating window opens.
Phase-Matched Movement
Exercise recommendations tailored to your current phase — from gentle yoga during menstruation to HIIT in your follicular phase. Intensity guidance that matches your energy and recovery capacity.
Learn & Understand Your Body
20+ in-depth articles on hormones, fasting science, cycle biology, and myths. Interactive hormone map showing estrogen, progesterone, LH, and FSH across your cycle. Honest, evidence-based language.
Nourish Every Phase
Phase-specific food suggestions — iron-rich foods during menstruation, lean proteins during follicular, and more. Understand why your body craves what it craves.
Symptom Tracking
Daily symptom logging across energy, mood, cravings, and more. Add notes for context and discover your personal patterns with trend analysis.
Interactive Hormone Map
A visual guide to what estrogen, progesterone, LH, and FSH are doing at every point in your cycle — and what that means for how you feel.
Share with Partner
Generate a shareable card explaining your current phase, mood, and needs. Help the people around you understand what you're going through.
Cycle Calendar
Customizable cycle and period length. Visualize your phases on a calendar so you always know what's ahead.
Smart Reminders
Fasting alerts and notifications synced to your cycle — nudging you at the right times, and backing off when your body needs rest.
Built on biology, not trends.
Your hormones shift dramatically across four phases — menstrual, follicular, ovulatory, and luteal. Each phase affects your metabolism, insulin sensitivity, energy, and stress tolerance differently.
Menstrual
Days 1–5
Estrogen and progesterone at their lowest. Your body needs rest and iron-rich nourishment. Gentle 12:12 fasting or none.
Follicular
Days 6–13
Rising estrogen improves insulin sensitivity. Your best window for 16:8 or 18:6 fasting and high-intensity training.
Ovulatory
Days 14–16
Peak estrogen + testosterone surge. High energy, moderate 14:10 fasting works well.
Luteal
Days 17–28
Progesterone raises calorie needs by up to 300 cal/day. Cravings are biology, not weakness. 12:12 max.
Fastara translates this science into daily, actionable guidance — automatically.
Stop fighting your cycle. Start working with it.
Most fasting apps treat every day the same. But your body isn't the same every day. Fastara is the first fasting app designed around the hormonal shifts that affect your metabolism, insulin sensitivity, energy, and stress tolerance.