The only fertility awareness app where every charting feature is free — forever. BBT tracking, cervical mucus, OPK tests, and more. No paywalls. No algorithm deciding your fertility. Your body, your knowledge.
Natural Cycles starts at $149/year. Flo locks core features behind $50/year. Clue pushes Clue Plus constantly. You shouldn't pay a subscription just to chart your temperature.
Most apps replace your understanding with a red/green day verdict. That removes the knowledge — and the autonomy — that makes fertility awareness actually work.
Flo paid $90M to settle FTC charges for sharing period data with Facebook. Ovia was acquired by Labcorp. Your fertility data is more sensitive than anything else on your phone.
Every feature below is free in Fertility Awareness. Competitors charge $50–$150/year for the same tools. The only thing we charge for is optional AI coaching.
| Feature | Fertility Awareness ✦ | Natural Cycles | Flo | Clue | Kindara | Read Your Body |
|---|---|---|---|---|---|---|
| BBT charting | ✓ Free | ~ Paid only | ~ Limited free | ~ Plus only | ✓ Free | ✓ Paid |
| Cervical mucus tracking | ✓ Free | ~ Paid only | ✓ Free | ✓ Free | ✓ Free | ✓ Paid |
| Cervical position | ✓ Free | ✗ | ✗ | ✗ | ✓ Free | ✓ Paid |
| OPK / Pregnancy test logging | ✓ Free | ✗ | ✓ Free | ~ Limited | ✓ Free | ✓ Paid |
| Spotting vs. period distinction | ✓ Free | ✗ | ~ Limited | ✓ Free | ✗ | ✓ Paid |
| Travel / sick / alcohol flags | ✓ Free | ~ Sick only | ✗ | ✗ | ✓ Free | ✓ Paid |
| Symptom severity levels | ✓ Free | ✗ | ~ Plus only | ~ Plus only | ✗ | ✓ Paid |
| User interprets their own chart | ✓ Always | ✗ Algorithm decides | ✗ Algorithm decides | ✗ Algorithm decides | ✓ Always | ✓ Always |
| AI coaching / guidance | ✦ Optional add-on | ✗ | ~ AI chatbot (paid) | ✗ | ✗ | ✗ |
| Data privacy model | Your data, no selling | GDPR compliant | FTC settlement 2021 | Berlin, GDPR native | Standard | Device-only option |
| Starting price | $0 forever | $149.99/year | $49.99/year | ~$25/year | $49.99/year | $20.99/year |
The symptothermal method works by combining multiple fertility biomarkers. We track all of them — without charging you for the ones that matter most.
Log your waking temperature each morning, see your coverline auto-calculated, and track the thermal shift that confirms ovulation. Works with any basal thermometer.
Log mucus observations with the detail they deserve — type, sensation, color — plus cervical position and firmness. The most complete mucus tracking in the market, free.
Log LH test results, pregnancy tests, and progesterone test strips to build a complete hormonal picture alongside your physical signs.
Track headaches, cramps, breast tenderness, mood, energy, and 30+ more symptoms with graduated severity — so your chart tells your full story.
Mark temperatures taken after travel, illness, alcohol, or disrupted sleep. Your chart stays honest — and you stay in control of what data you trust.
The symptothermal method reveals patterns your calendar never could. A few minutes each morning is all it takes.
Each morning, before getting up, measure your waking temperature with a basal thermometer. Log it in seconds. The app builds your chart automatically.
Log your cervical mucus observations, position if you check it, and any symptoms. Each sign adds a layer of clarity to your fertility picture.
Watch your thermal shift emerge, your mucus pattern build, and your cycle phases reveal themselves — interpreted by you, not an algorithm.
Want a knowledgeable companion to discuss your chart? AI coaching is there when you want it — teaching you to read your own signs, not replacing your understanding.
Fertility and cycle data is the most intimate information you generate. After Flo's FTC settlement and Ovia's acquisition by Labcorp, you deserve a clear answer about where your data goes.
Our answer: it stays with you. We earn revenue only through optional AI coaching subscriptions — never through data monetization, advertising, or third-party sharing.
Your cycle data is never sold, licensed, or shared with third parties for any commercial purpose.
We earn from AI coaching subscriptions only. Our interests align with yours, not with advertisers.
Request full account and data deletion at any time. No cooling-off period, no retention.
Clear, plain-language privacy policy. No legalese designed to obscure. You know exactly what we store.
AI coaching fills the gap between raw charting data and true body literacy. It's the difference between knowing your temperature and understanding what it means.
Chart interpretation guidance — Get personalized explanations of your BBT patterns, mucus observations, and what they indicate within your chosen FAM method.
Cycle-aware pattern analysis — Understand your cycle's unique rhythms across months, with insights connecting your physical signs to your overall health.
Education in context — Learn the Sensiplan rules, Creighton observations, or TCOYF guidelines through questions about your own real chart — not generic explanations.
Always available, never replacing your educator — AI coaching supplements professional FAM instruction, never replaces it. It knows when to say "talk to a certified educator."
From recovering from hormonal birth control to trying to conceive, fertility awareness changes the relationship women have with their own bodies.
"After 10 years on the pill, I didn't know what my natural cycle looked like. This app helped me chart my first real cycles with so much clarity. The BBT chart alone showed me my cycle was longer than any app had ever predicted."
"I used Kindara for years but it's been dying. This app is what Kindara should have become — free, comprehensive, method-agnostic. I exported my data and was up and running in minutes. The AI coach actually explained Sensiplan rules in the context of my own chart."
"The privacy thing matters so much to me post-Dobbs. I'd stopped using Flo entirely. Finding an app that has absolutely no interest in my data beyond charging for coaching? It's honestly a relief. I can chart in peace."
Fertility awareness is a serious health practice. You deserve clear, medically accurate information — not marketing fluff.
Join women who've moved from guessing to knowing. Everything you need to practice fertility awareness is free — always.
Free forever · No credit card · No trial expiry · Works on web, iOS & Android