Stop guessing.
Start understanding your body.
AI plus 19 years of natural family planning experience. Track your cycle, discover patterns, and understand your fertility, all in 60 seconds a day.
Menstruation
days 1–5
Follicular
days 6–13
Ovulation
days 14–16
Luteal
days 17–28
Phase: Ovulatory
Peak fertility: days 14–16
Basal body temperature
Sound familiar?
“When was my last period? Hmm... I can't remember.”
“At the doctor's I can't say exactly when things happened.”
“The same headaches every month and I have no idea why.”
“My husband doesn't understand why I'm so tired sometimes.”
If any of these sounds like you, FertilityFlow is for you.
FertilityFlow turns guessing into understanding.
Log temperature and mucus. AI reviews your entries and tells you what it sees: when you ovulate, why the headaches come, what repeats cycle after cycle.
Built with Monika, an NFP educator with 19 years of experience. Every AI insight is grounded in what she teaches couples in consultations.
🤖 AI Insights
- Ovulation detected between days 13–15
- Headaches correlate with LH surge (4/5 cycles)
- Shortened luteal phase, worth discussing with your doctor
Analysis based on your data · Premium
How to start? 3 simple steps.
Create account in 2 minutes
Answer a few questions about your cycle, and you're set.
Log daily in 60 seconds
Temperature, mucus, and symptoms: tap them in and you're done, even from the couch in the evening.
AI shows you what your data reveals
After a few days, AI shows you what is in your data. The longer you log, the more specific the analysis.
✓ No credit card required
What you get with FertilityFlow
60 seconds a day
Temperature, mucus, and symptoms, logged faster than making a cup of tea, every day, without the stress.
AI that reads your patterns
Ask "Why do I get headaches on day 14?" and get an answer in seconds, based on YOUR data.
Partner who understands
His own dashboard, education, and context of your cycle. You won't have to explain it anymore.
Color-coded phase calendar
See at a glance what phase you're in, so there are no more surprises, and know when your next period is predicted.
Doctor-ready reports
Print it and show your OB/GYN, instead of saying "it was around day 15, I think."
20+ courses from an expert
Written by an NFP educator with 19 years of experience, from beginner to advanced.
Created by an NFP teacher
with 19 years of experience
Monika Dowejko
Certified NFP Educator
19 years of practice · PhD in reproductive endocrinology
“For 19 years I have taught couples to understand fertility. FertilityFlow holds everything I teach, so now you can have it with you even when I am not there.”
🛡️ 30-day guarantee
If after 30 days you don't understand your cycle better than you do now, we'll refund you, no questions and no explanations needed.
Just email support@fertilityflow.app and we'll refund in full within 48h.
No questions asked. Full refund.
Questions? We have answers.
Ready to understand
your cycle?
Join women who consciously track their fertility. Less than 100 founding spots remaining.
Stop guessing. Start understanding your body.
Built with 19 years of natural family planning experience.
Simple pricing. No hidden fees.
Founding
Join the inner circle of FertilityFlow founders
Shown in your local currency at checkout
Lowest founding tier price ever
Everything in Free, plus:
- Everything from the Free plan, plus:
- Ask AI about your symptoms, like "Why do I get headaches on day 14?" and get an answer in seconds, based on YOUR data
- AI detects patterns you can't see, such as "Your headaches appear around ovulation in 4 of 5 cycles"
- Doctor-ready reports you can print and show your OB/GYN, instead of saying "it was around day 15, I think"
- 20+ courses from an educator with 19 years of NFP experience, from beginner to advanced
- Partner portal, so he can understand your cycle too, and you won't have to explain it anymore
- Lab result analysis: upload FSH, LH, and progesterone results, and AI explains what they mean
Limited spots
1 / 100
99 founding spots remaining.
AI Premium
Everything in Free, plus:
- Everything from the Free plan, plus:
- Ask AI about your symptoms, like "Why do I get headaches on day 14?" and get an answer in seconds, based on YOUR data
- AI detects patterns you can't see, such as "Your headaches appear around ovulation in 4 of 5 cycles"
- Doctor-ready reports you can print and show your OB/GYN, instead of saying "it was around day 15, I think"
- 20+ courses from an educator with 19 years of NFP experience, from beginner to advanced
- Partner portal, so he can understand your cycle too, and you won't have to explain it anymore
- Lab result analysis: upload FSH, LH, and progesterone results, and AI explains what they mean
Free
Forever. No credit card required.
- Daily log in 60 seconds: temperature, mucus, and symptoms, faster than making tea
- Color-coded phase calendar, so you see exactly where you are in your cycle at a glance
- Next period prediction, so there are no more surprises
- 3 courses from an NFP educator, covering fundamentals every woman should know
- Your data, always yours: secure, private, and belongs to you
- AI Chat, ask about YOUR specific symptoms
- Pattern detection in your cycle data
- Doctor-ready reports
- Full library of 20+ courses
- Partner portal
No credit card