Top 8 Fertility Apps to Track Ovulation and Get Pregnant Faster
The best fertility apps help you pinpoint your fertile window, track ovulation signs, and time conception with real accuracy. Whether you are trying to conceive naturally, working with a sperm donor, or simply getting to know your cycle better, these tracking tools put powerful data in your pocket. With the fem-tech market now worth over $1 billion globally, the range of fertility apps available on iOS and Android has exploded — but not all of them are equal. Some rely on basic calendar maths, while others use basal body temperature data, hormone tracking, and machine learning to deliver precise predictions.
We have rounded up the best fertility apps to help you take control of your journey to parenthood. CoParents.co.uk, a co-parenting and sperm donation platform with over 150,000 members since 2008, supports every path to family building — and choosing the right tracking tool is a great first step.
How Do Fertility Apps Work?
Most fertility apps track your menstrual cycle to predict your fertile window — the roughly six-day period each month when conception is possible. According to the NHS, ovulation typically happens 10 to 16 days before your next period starts. Sperm can survive inside the body for up to five days, so your most fertile days are the few days leading up to ovulation and the day of ovulation itself.
Basic cycle tracking apps use the calendar method, calculating averages from your past cycle lengths. More advanced apps layer in additional data — basal body temperature (BBT), cervical mucus observations, ovulation test results, and even wearable sensor data — to improve accuracy. The more information you log, the smarter these apps become at predicting your unique fertility pattern.
What Are the Best Fertility Apps for Trying to Conceive?
1. Flo
Flo is one of the most popular cycle and ovulation trackers on the market, used by over 440 million people worldwide. It combines period tracking with ovulation predictions powered by machine learning, and its interface is clean and intuitive. Flo lets you track symptoms, mood, sleep, and physical activity alongside your cycle data. A built-in community allows users to ask anonymous questions and share experiences. Pregnancy and post-pregnancy modes keep monitoring your health even after you conceive.
2. Clue
Clue stands out for its science-first approach and strong data privacy — your information is protected under strict EU privacy laws. The app partners with leading universities including Oxford, Berkeley, and MIT to improve cycle prediction algorithms. With over 30 tracking categories covering mood, pain, skin, hair, energy, and cervical fluid, Clue provides a detailed picture of your hormonal health. The Clue Conceive feature offers personalised predictions designed specifically for people trying to get pregnant.
3. Natural Cycles
Natural Cycles is the first fertility app to receive FDA clearance as a medical device. It uses basal body temperature data — recorded via a provided thermometer, Apple Watch, or Oura Ring — to confirm ovulation and identify fertile days. The algorithm analyses your personal temperature patterns rather than relying on generic cycle averages, making it especially useful for people with slightly irregular cycles. A subscription is required, but the accuracy is backed by peer-reviewed clinical studies.
4. Fertility Friend
Fertility Friend is one of the most data-rich ovulation trackers available. It allows you to track BBT, cervical fluid, ovulation test results, and dozens of other fertility signs, then displays your data in detailed, easy-to-read charts. The app’s algorithm uses this information to deliver a precise fertility window. It is a favourite among users who want deep analysis of their cycle data rather than a simplified overview.
5. Premom
Premom pairs an ovulation test reader with intelligent fertility charting. You photograph your LH test strips and the app analyses the results digitally, removing the guesswork from reading faint lines. It also tracks BBT, cervical mucus, and cycle symptoms. Over 1.5 million users have logged positive pregnancy results while using the app. Premom syncs with Easy@Home ovulation test kits and Bluetooth BBT thermometers for seamless data capture.
6. Ovia Fertility
Ovia is a strong choice for women with irregular cycles. Its proprietary algorithm adapts to your unique patterns, and the app claims to help women conceive up to three times faster than using no tracking at all. Ovia includes access to thousands of expert articles on fertility, nutrition, and reproductive health. Pregnancy and postpartum modes let you continue tracking as your journey progresses.
7. Kindara
Kindara offers science-backed charting tools alongside a supportive community of people on similar fertility journeys. Users can track and chart cycles, fertile days, BBT, and cervical fluid. Kindara is well suited to anyone following the fertility awareness method (FAM) and wanting a clear visual record of their cycle data.
8. Daysy
Daysy combines a dedicated fertility monitor with an app for highly accurate ovulation tracking. The monitor measures your BBT each morning in under 60 seconds, then compares your data against a database of over 5 million menstrual cycles to predict fertile windows. Daysy is FDA-cleared and claims accuracy of over 99%. It suits anyone who wants a simple daily routine without logging multiple symptoms manually.
Which Fertility Apps Use Wearable Technology?
Several of the best fertility apps now integrate with wearable devices for continuous, hands-off data collection. Natural Cycles works with Apple Watch and Oura Ring to capture BBT while you sleep, removing the need to take your temperature at the same time every morning. Tempdrop — a dedicated wearable armband — records continuous temperature data overnight and syncs with its companion app to chart ovulation patterns. These wearable-based trackers are particularly useful for people with irregular schedules, shift workers, or anyone who finds manual BBT tracking difficult.
What Should You Look for When Choosing Fertility Apps?
Not every app suits every user. Here are the key factors to consider:
- Tracking depth: Basic apps track periods and predict ovulation from calendar data. Advanced options add BBT, cervical mucus, LH test results, and wearable integration for higher accuracy.
- Data privacy: Check how the app handles your health data. Apps like Clue and Euki store data under strict privacy rules or locally on your device, which matters if data security is a concern.
- Algorithm quality: Look for apps that use adaptive algorithms learning from your personal data — not just generic 28-day cycle averages.
- Cost: Many of these apps offer free basic tracking, but advanced features like hormone insights or wearable syncing often require a subscription ranging from £5 to £15 per month.
For a medically reviewed comparison of leading options, Healthline’s guide to the best fertility apps is a useful reference.
Do Fertility Apps Actually Help You Get Pregnant?
Fertility apps can significantly improve your chances of conception by helping you identify the days when pregnancy is most likely. Research shows that timing intercourse or insemination within the fertile window — particularly the two days before ovulation — gives the highest probability of conception. According to NHS data, more than 8 out of 10 couples where the woman is under 40 will conceive within a year of regular unprotected sex. Adding accurate ovulation tracking through fertility apps can shorten that timeline by helping you focus on the days that matter most.
It is worth noting that fertility apps are tools, not guarantees. A 2024 study in the journal Reproductive BioMedicine Online found that app-based cycle tracking improved cycle awareness in over 85% of users, but accuracy varied widely depending on which data points were logged. Apps that combine BBT with LH testing consistently outperformed calendar-only methods.
However, no app replaces medical advice. If you have been trying to conceive for over 12 months (or 6 months if you are over 35), speak to your GP for a fertility assessment. Conditions like PCOS, endometriosis, or irregular cycles may need clinical investigation beyond what any app can provide.
Frequently Asked Questions
Are fertility apps accurate enough to rely on?
Most fertility apps provide useful estimates, but accuracy depends on how much data you log and the quality of the algorithm. Apps using BBT and hormone data — like Natural Cycles or Daysy — tend to be more accurate than calendar-only trackers. No app is 100% precise, so combining app tracking with ovulation test strips improves reliability.
Can I use these apps if I have irregular periods?
Yes, but choose carefully. Standard calendar-based apps struggle with irregular cycles. Fertility apps that track BBT or LH hormone levels — like Ovia, Premom, or Tempdrop — adapt to your individual patterns and can still identify ovulation even when cycle length varies.
Are free fertility apps good enough?
Free versions of Flo, Clue, and Premom offer solid basic tracking. However, premium features like advanced algorithm predictions, wearable integration, and personalised insights usually require a paid subscription. If you are actively trying to conceive, investing in a premium tier or a dedicated device like Daysy may be worth the cost.
What is the difference between fertility apps and ovulation test kits?
Cycle tracking apps predict ovulation based on data and symptoms. Ovulation test kits (OPKs) detect the LH hormone surge that happens 24 to 36 hours before ovulation. Using both together gives you the most complete picture — the app identifies your likely fertile window in advance, and the test kit confirms the surge is happening.
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