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
“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.”
“Every article says something different. I still don't know what applies to me.”
“It's my most private data. Who else is seeing it?”
If any of these sounds like you, FertilityFlow is for you.
Here is what couples tell us they struggle with, and exactly how FertilityFlow helps.
The problem
How we solve it
Temperature, cervical mucus and symptoms go into one simple daily log. Tap a few options and save. Nothing to memorise, nothing to write up later.
Daily log in 60 seconds
The problem
How we solve it
A colour-coded calendar shows your phase, your fertile window and when your next period is expected. It works whether you are trying to conceive or simply want to understand your body.
Phase calendar and period prediction
The problem
How we solve it
Ask AI a question such as "why do I get headaches around day 14?" and get an answer based on your own entries, plus the patterns that repeat from cycle to cycle.
AI that reads your patterns
The problem
How we solve it
Print a clear report of your cycles and show it at your appointment, instead of saying "it was around day 15, I think." AI does not diagnose; it helps you start a better conversation.
Doctor-ready reports
The problem
How we solve it
Your partner gets their own dashboard: your current phase, your fertile window, plain-language hints on how to support you, and short lessons made for him. You choose what is shared.
Partner portal
The problem
How we solve it
Clear courses written by an NFP educator with 19 years of practice, from the basics to advanced. Three are free, so you can start learning today.
20+ courses from an expert
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
Analysis based on your data · Premium
No long forms and no homework. A tiny daily habit that adds up to real knowledge about your body and your partnership.
60 sec
Log
Temperature, mucus and symptoms, in a few taps.
60 sec
Understand
See your phase for today, what it means and, with Premium, what AI notices.
Day 1
Your calendar shows your phase and when to expect your next period. No more guessing.
First cycle
Your temperature shift, your mucus changes and your fertile window start to make sense, because they are yours.
After a few cycles
Headaches, mood and energy linked to phases. Walk into the doctor's office with a report, not a guess.
Together
Your partner knows what is happening and how to support you, without a weekly explanation.
The more days you log, the more useful the insights become. Missed a day? Just carry on; nothing is lost.
Answer a few questions about your cycle, and you're set.
Temperature, mucus, and symptoms: tap them in and you're done, even from the couch in the evening.
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
Fertility data is some of the most personal information there is. We built FertilityFlow so you never have to wonder who can see it.
We do not sell your personal data to anyone. Our income comes from Premium subscriptions, not from your information.
Your data is kept on EU servers and handled under GDPR, with a clear legal basis and your rights built in.
Your data is encrypted in transit and in storage, and protected by strict access controls.
Your partner sees your cycle phase and fertile window, not your raw observations. Switch each type of sharing on or off in settings, or disconnect whenever you like.
Download all your data in one click, or delete your account yourself. It is your data, so it is your call.
When you ask the AI a question, it is processed by our AI provider under a data processing agreement. Read exactly how in our Privacy Policy.
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.”
What early users say
Early tester
“FertilityFlow works really well for me. The app is clear, easy to use, and helps me conveniently track my cycle and measurements. I especially appreciate that the team listens to user feedback and rolls out improvements quickly — it gives me the sense that the app is developing in a genuinely good direction.”
“I'm glad I can be one of the first people to test the app, and I'll gladly keep following its progress.”
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.
Join women who consciously track their fertility. Less than 100 founding spots remaining.
Built with 19 years of natural family planning experience.
Simple pricing. No hidden fees.
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