Track your fertile window accurately and give yourself the best chance of conceiving.
When you're trying to conceive, timing matters. Pregnancy is only possible during a 6-day window each cycle — the 5 days before ovulation and the day of ovulation itself. The right app helps you identify that window accurately, every cycle.
Here are the best apps for trying to conceive in 2026, compared by the features that actually matter for TTC.
| App | Price | Fertile Window | BBT Tracking | CM Tracking | OPK Support |
|---|---|---|---|---|---|
| WomensPal Best Free | Free | ✓ | ✓ | ✓ | ✓ |
| Natural Cycles | $119.99/yr | ✓ (BBT-based) | ✓ Required | Limited | Limited |
| Ovia Fertility | Free / Premium | ✓ | ✓ | ✓ | ✓ |
| Kindara | Free / $9.99/mo | ✓ | ✓ | ✓ | Limited |
| Flo | $39.99/yr | Premium | Premium | Limited | ✗ |
The foundation. Logging your period dates for 3+ cycles lets the app calculate your average cycle length and estimate when ovulation is likely to occur.
Your resting temperature rises slightly (0.2–0.5°C) after ovulation. Tracking this daily confirms when ovulation happened, helping you time cycles better in future months.
Cervical mucus changes throughout your cycle — from dry to creamy to egg-white consistency around ovulation. Egg-white cervical mucus is your body's signal that ovulation is imminent.
OPK strips detect the LH surge that precedes ovulation by 12–36 hours. Logging your test results in a TTC app builds a more accurate picture of your ovulation timing.
WomensPal is the most complete free TTC app available. It combines cycle history, BBT, cervical mucus, and ovulation test data into an accurate fertile window prediction — and it's completely free.
Unlike Flo (where ovulation insights are premium) or Natural Cycles (which costs $119.99/year), WomensPal gives you full fertility tracking with no subscription. When you conceive, the app automatically transitions to a pregnancy tracker with week-by-week updates, kick counter, and contraction timer — with no need to switch apps or lose your tracking history.
Natural Cycles uses your daily basal body temperature to predict your fertile window with high accuracy. It's FDA-cleared as a contraceptive method and works well in TTC mode too. The downside: it requires daily BBT measurements (you have to take your temperature before getting out of bed every morning), and it costs $119.99/year — significantly more expensive than free alternatives.
Ovia Fertility is a comprehensive TTC tracker with good fertile window predictions. However, Ovia has partnerships with employers and insurers that involve sharing aggregate health data, which raises privacy concerns for some users. The free version has solid features but can push users toward its premium offering.
WomensPal gives you full TTC tracking — fertile window, BBT, cervical mucus, OPK logging — completely free.
Start free — no subscription →WomensPal is the best free TTC app — it tracks your fertile window, ovulation, BBT, cervical mucus, and LH surge to help you identify your best days to conceive, all free.
TTC apps identify your fertile window (the 6 days each cycle when pregnancy is possible) by tracking your cycle, ovulation symptoms, BBT, and cervical mucus. Timing intercourse during this window significantly increases your chances of conception.
Natural Cycles has a TTC mode but at $119.99/year it's significantly more expensive than free alternatives like WomensPal, which offers the same fertility tracking features for free.
Most couples who time intercourse accurately to the fertile window conceive within 3-6 months. An app doesn't replace medical advice if you've been trying for 12+ months without success.