Syncing…
Syncing…
What you get
The whole point is simple: fast enough to feel the benefits, never so much that your hormones pay for it — and know exactly what to eat along the way. Here’s how each piece works.
Three minutes to set up. A lifetime of not guessing.
Your cycle length, or your stage: perimenopause, menopause, or irregular cycles. Two questions, and your data stays private.
Every morning: today's fasting hours, today's foods, and why — in plain words, not medical jargon.
The timer runs itself, challenges keep you going, and the plan adapts as your body changes.
No credit card. No calorie counting. Cancel any time once we launch.
The right hours
Most fasting advice hands you one fixed window and tells you to white-knuckle it every day. But estrogen and progesterone rise and fall across your month, and each responds to fasting differently.
Push a long fast on the wrong day and you can spike cortisol, wreck your sleep, and knock your cycle off balance. FastSyncer turns the science into one simple daily number — how long to fast today — so you go longer when your body can handle it and ease off when it needs fuel.
Your fasting hours across one month
Example month — your plan adapts to your own cycle.
The science
Research on fasting and female physiology keeps landing on the same point: timing matters. Estrogen-dominant days handle long fasts well. In the days before your period, rising progesterone needs food — and pushing a hard fast then can raise cortisol and backfire.
Want the deep dives? Read the blog or explore FastingInPractice.com.
Drag through the cycle — feel how the plan moves.
16 hours
Hormones are at their lowest and your body handles a longer fast comfortably — a good window to push.
Cycle day 5. Low-hormone days. Recommended fast: 16 hours.
Nutrition
Fasting is only half the story. What you eat when you break your fast matters just as much for your hormones — and getting the right nutrition is one of the most important things a woman can do at any stage.
Every day, FastSyncer shows the foods, vitamins and minerals that support the hormones your body is making right now. No calorie counting, no rigid meal plans — it works with your food culture, not against it.
Today’s plate · Rebuild days
Healthy fats
avocado, olive oil, nuts
Quality protein
eggs, fish, lentils
Cruciferous veg
broccoli, cabbage — estrogen support
Slow carbs
sweet potato, squash — progesterone fuel
Every stage
Most fasting apps stop being useful the moment your cycles get irregular. FastSyncer is the opposite — it’s built around the idea that where you are matters most.
Whether your periods are regular, all over the place, or have changed with perimenopause or menopause, you get a track made for your stage — driven by your daily check-ins and symptoms instead of a one-size calendar.
Regular cycles
Follows your cycle day by day.
Irregular cycles
Driven by your check-ins, not the calendar.
Perimenopause
Adjusts as your hormones shift.
Menopause
Focus on insulin sensitivity and muscle.
Monthly challenges
Every month is a fresh challenge you can join. One tap a day to check in, a quick mood log, a real streak, and medals when you finish — with thousands of women doing the same month alongside you.
It’s warm, never pushy. The whole design celebrates showing up, not suffering — there’s no shame for an easy day and no punishment for a rest day.
July challenge
12 day streakWe saw you show up. 💚
Smart tracker & analytics
Tell it your usual start time once. The fast begins on its own, you get a gentle ping the moment you reach your goal, and every hour is logged for you — no stopwatch to remember.
Over time, clear charts show your fasting hours, your mood, and your progress, so you can see what’s actually working for your body.
Fasting now · auto-started 20:00
14:32
Last 7 days
Smart reminders
Personalised nudges arrive in your own timezone — a gentle reminder to check in, a celebration when you hit your goal — and they go quiet overnight so nothing wakes you.
You’ll never be spammed. At most one nudge a day, always encouraging, never a guilt trip.
Sara — you just hit 16 hours 🎉
Goal reached · 2m ago
Day 12. You’ve shown up every day.
Gentle check-in · 1h ago
Quiet hours
22:00 – 08:00 · in your timezone
Want the research behind all this? Read the FastSyncer journal or browse our questions, answered.
Join the waitlist and get early access, launch-day pricing, and our women’s fasting starter guide by email — free.
Coming soon to iOS & Android · No spam, unsubscribe any time.