Understand your cycle, predict ovulation, and maximise your chances of conceiving.
Fertility tracking has become much more sophisticated than simply counting days on a calendar. Modern fertility apps combine multiple data streams — cycle history, basal body temperature, cervical mucus, hormone tests — to give you an accurate picture of when ovulation is approaching. Here's what the best apps offer in 2026.
| App | Price | Fertile Window | BBT Chart | Hormone Testing | Pregnancy Mode |
|---|---|---|---|---|---|
| WomensPal Best Value | Free | ✓ | ✓ | OPK logging | ✓ Free |
| Natural Cycles | $119.99/yr | BBT-based | ✓ | LH strips | Separate |
| Inito | Device + app | Hormone-based | ✓ | 4 hormones | Limited |
| Clue Plus | $39.99/yr | Limited | Basic | ✗ | Premium |
| Premom | Free / Pro | ✓ | Basic | OPK scan | ✗ |
Fertility tracking works by identifying the signs your body produces around ovulation. There are four main methods, and the best apps let you use all of them together:
FAM combines calendar tracking, BBT, and cervical mucus observation to identify your fertile window. It's the basis of most fertility apps and, when done correctly, is highly effective for both TTC and as contraception.
Apps like Inito pair with a device that measures four key hormones (FSH, LH, estrogen, progesterone) from urine samples. This is the most accurate method but requires purchasing hardware ($149+). Apps like WomensPal let you log OPK strip results as a more affordable alternative.
Some fertility apps integrate with wearables like the Apple Watch or Oura Ring to track resting heart rate and temperature variations — additional data points that can improve prediction accuracy.
WomensPal offers comprehensive fertility tracking without any subscription fee. You can track your cycle, log daily BBT with a visual chart, record cervical mucus observations, and log OPK test results — and the app combines all of these into an accurate fertile window prediction that improves with every cycle.
When you conceive, WomensPal transitions seamlessly into a full pregnancy tracker — week-by-week updates, kick counter, contraction timer — without needing to switch apps or lose your cycle history. This continuity from fertility tracking through pregnancy is unique to WomensPal among the free apps.
If you want the highest clinical accuracy and are willing to measure BBT every morning, Natural Cycles is the gold standard. It's FDA-cleared, peer-reviewed, and used by millions. At $119.99/year (plus thermometer cost), it's a significant investment — but for women who are serious about hormone-free family planning or TTC, it delivers.
Inito is a fertility monitor that measures four key hormones — FSH, LH, estrogen, and progesterone — directly from urine samples, using a sensor you attach to your phone. It's the most comprehensive home fertility monitoring available, and the app gives you a clear picture of your hormonal cycle. The device costs around $149, plus ongoing test strips. Not for everyone, but powerful for women with irregular cycles or fertility challenges.
Full BBT charting, OPK logging, fertile window prediction and seamless pregnancy mode. WomensPal is free, always.
Start free — no subscription →WomensPal is the best free fertility app — cycle, BBT, cervical mucus, and OPK logging combined into an accurate fertile window prediction, completely free.
Fertility apps help by identifying your fertile window so you can time intercourse more accurately. Women who track their cycles get pregnant faster than those who try randomly.
WomensPal and Natural Cycles both excel at BBT charting. WomensPal is free; Natural Cycles is the FDA-cleared option at $119.99/year.
If you've been trying to conceive for 12 months (or 6 months if you're over 35) without success, consult a reproductive endocrinologist regardless of what your tracking app says.