Intermittent fasting
built for the
female body

The first intermittent fasting app that helps women fast like a girl, syncing your fasting plan to your menstrual cycle, so you lose weight, balance your hormones, and actually feel good doing it. Built by women, for women.

Download on the App Store

Free to start. Available on iPhone.

4,200+ women fasting with their cycle

Why fasting for women is different

A woman's body runs on a 28-day cycle, and what works in Week 1 actively works against you in Week 3. Fasting the same way every day ignores all of that.

The app tells you exactly what to do every day, based on where you are in your cycle.

Lose weight - and keep it off
When you fast at the right phase, your body keeps burning fat efficiently.
Wake up with real energy
Fasting at the wrong time drains you. At the right time, it fuels you with steady energy.
Feel like yourself again
Fewer mood swings, less bloating, better sleep.

What does it mean to fast like a girl?

Fasting like a girl means timing your fasting windows to your menstrual cycle instead of fasting the same way every day. A woman's hormones shift across a 28-day cycle, so the fasting protocol that works in week one can backfire in week three.

There are four phases. In Renew (your period), short, gentle fasts of around 12 to 14 hours support recovery. In Rise (the week after your period), your body handles longer fasting windows of 14 to 18 hours well. In Peak (around ovulation), 13 to 15 hour windows protect your energy. In Nurture (the week or two before your period), shorter, gentler windows of 12 to 14 hours fit best, or no fast at all if your body is asking for rest.

FastingBestie tells you exactly which phase you're in and how to fast for it, automatically, every day.

Read the full guide: how to fast with your cycle →

Everything your body needs.
Finally in one place.

The simplest way for women to start intermittent fasting, and actually stick with it.

01

Know exactly when and how long to fast

Your fasting window updates automatically with your cycle, synced via Apple Health.

02

Give your body the support it needs

Simple guidance for each phase - to help with cravings, bloating, metabolism, and mood.

03

Stay consistent with coaching that feels kind

Small daily nudges that feel supportive, not shamey. Your plan adjusts to how you feel.

★★★★★
Fasting that finally feels right.
"I've tried fasting apps before and they always made me feel like I was failing. This one just makes sense."
Jess, 36, London
"Week 3 used to be a disaster. Now I stop pushing and my cravings are gone. The weight is finally moving."
Maria, 41, Sydney
"The cycle syncing is everything. I feel calmer, sleep better, and I'm not constantly fighting my body."
Sandra K., 48, Toronto

Ready to start?

Join 4,200+ women fasting
with their cycle

Download FastingBestie on the App Store for personalised, cycle-synced guidance through every phase, right on your iPhone.

Download on the App Store

Everything women want to know
about fasting for their cycle

Is there an app to help me fast like a girl?
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Yes. FastingBestie is an intermittent fasting app built specifically to help women fast in sync with their cycle. Your fasting window, food guidance, and daily focus adjust automatically across the four phases of your cycle: Renew, Rise, Peak, and Nurture.
What is cycle-synced intermittent fasting for women?
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Cycle-synced intermittent fasting adjusts your fasting window and food choices based on where you are in your menstrual cycle. Longer fasting windows during your Power Phase, shorter windows at ovulation, and no fasting in the week before your period.
Is intermittent fasting safe for women?
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Intermittent fasting is safe and effective for women when timed correctly to the menstrual cycle. The energy crashes and hormonal disruption most women experience typically arise from fasting too aggressively at the wrong phase. If you have a medical condition, please consult your doctor before starting.
How is this different from other intermittent fasting apps for women?
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Most fasting apps give you the same timer every day. FastingBestie adjusts your full daily plan - fasting window, food guidance, workout intensity, and focus tips - based on your current menstrual cycle phase.
Does fasting for women work with PCOS, perimenopause, or irregular periods?
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Not fully yet. Today, FastingBestie is built primarily for menstrual-cycle-aware fasting. Dedicated support for irregular cycles, PCOS, perimenopause, and postmenopause is not live in the app yet, but it is planned. Until then, our guides library covers those situations with more nuance.
How quickly will I see results from cycle-synced fasting?
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Most women notice improved energy and reduced bloating within the first two weeks. Weight loss typically follows in weeks two to four, with the most significant results appearing after one full menstrual cycle.
Will I be hungry during intermittent fasting?
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Much less than you'd expect. We start all beginners on a 13-hour window. For most women, this means not eating after dinner and having breakfast at the usual time. Hunger becomes minimal as your body adapts, especially during your Power Phase.
Is FastingBestie free?
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The app offers a free trial so you can experience the real benefits of cycle-synced fasting before continuing with a paid subscription. No commitment required. Try it and see the difference for yourself.
I need help
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We're here for you. Drop us an email at and we'll get back to you as soon as we can.