Want kids one day? Take the quiz
Meet the Modern Fertility App: our new ovulation and period tracker

Meet the Modern Fertility App: our new ovulation and period tracker

7 min read

The Modern Fertility App, which pairs seamlessly with the Modern Fertility Ovulation Test and Pregnancy Test, is now officially available in the iOS App Store.

Why an app and why now? We hear all the time in the Modern Community that it’s important to have a full picture of your cycle, with everything together in one place. So, we set out to design an app that tracks periods, ovulation, sexual activity or insemination, and pregnancy test results — and gives you *smart* predictions for future cycles.

We worked closely with our medical advisory board and devoured countless clinical studies to incorporate the science behind both ovulation and the menstrual cycle — all to make sure our app had a strong foundation of research and the best predictive algorithm possible. After many conversations, papers, and (obsessive) testing and tweaking, the Modern Fertility App is finally ready to go.

So, let’s dive into the nitty gritty of the app and why we think it’ll soon be a mainstay on your home screen.

4 reasons to use the Modern Fertility App

Think of the Modern Fertility App as an ovulation tracker, period tracker, and fertility tracker in one streamlined, beautifully designed package. If you’re trying for kids, use the app to predict the 2 days you’re most likely to get pregnant. If you’re not, use it to get in sync with your cycle and better understand your body’s patterns. Either way, the app is here for you in whatever way you need it to be — and it’ll never make any assumptions about why you’re tracking, what your reproductive goals are, or how you identify. It’s free to download, free from ads, and pretty fun to play with.

Now that you know what the app is, it’s time to cover what it does. With the app, you can:

  • Pinpoint your fertile window and your 2 most fertile days. The app will use your logged data to predict ovulation and identify the days when you have the highest chances of getting pregnant (the day before and the day of ovulation).
  • Get *smart* predictions based on your cycle — or supercharge them with your actual hormones. The app can predict future periods and fertile days just using your logged periods, but scanning and logging Modern Fertility Ovulation Test results make predictions even more accurate. (Plus, predictions only get better with time.)
  • Track your periods, ovulation, and sex or insemination... all in one place. No more switching between different apps to capture different aspects of your cycle.
  • See all of your logs and predictions on a simple, easy-to-use calendar. The app color codes the days on your calendar when you can expect your period, ovulation, your most fertile days, and when sex or insemination overlaps with your fertile window. (It’s an organizer’s dream.)
Log protected sex, unprotected sex, or insemination and see it all on your calendar.

The features we’re most excited about

But what makes the Modern Fertility App different from all of the (many) tracking apps out there? Here are some of the biggest ways our app shines:

1. You can scan and log our Ovulation Test results ~like magic~ with your phone’s camera.

The Modern Fertility Ovulation Test measures luteinizing hormone (LH) in your urine. Why LH? The hormone surges about 24-48 hours before ovulation to prompt the ovary to release an egg. Tracking LH helps you catch that surge, predict ovulation, and time sex or insemination around your 2 most fertile days (the day of and the day after your LH surge).

Using the app’s *built-in* scanner, you can log your Ovulation Test results for an instant read on your LH. That means no expensive add-on gadgets or trying to eyeball the differences between test results. (Scanning your test results is kind of like scanning a check… except it’s knowledge you’re depositing.)

Bringing your hormones into the mix grounds your cycle predictions in your unique biology.

The Modern Fertility Ovulation Test and your "LH curve."

2. You can visualize your own unique “LH curve.”

Once you start tracking LH with the app, you’ll see all of your logged LH levels over time as points on a line graph — we call this your “LH curve.”

Your LH curve will show you exactly where your LH surges (rises rapidly), what that means for your fertile window and 2 most fertile days, and how your unique surge compares with the “average” LH surge value (25 mIU/mL). All bodies are different — and all hormone levels are different too. Now you’ll be able to better understand yours.

3. You can opt in for a countdown to the best days to test for pregnancy.

If you’re trying for kids, you can turn on recommendations for the best times in your cycle to take pregnancy tests — as well as keep track of each test result — all from inside the app. (No mental calendaring or notebook scribbling required.)

Why is timing of pregnancy testing important? Testing too early could result in a false negative because there might not be detectable levels of human chorionic gonadotropin (hCG, an early pregnancy hormone) in your urine yet.

If you get a positive pregnancy test result, you can pause your predictions until you’re ready to see them again. (Reminder: It’s always a good idea to check in with your doctor after a positive result.)

4. You can read educational tooltips for more info when you need it.

Any time you see an underlined phrase or question mark, tap it for a quick explainer on the topic. This means you won’t have to disrupt your scrolling to exit the app and search for answers somewhere else. Importantly, we believe it’s possible to be both clinically accurate and readable at the same time — so that’s what we always aim to do.

Looking at the app’s features, you might have noticed that the list of what it logs is fairly short and to the point. That’s by design — the app only asks for info that will improve your cycle predictions. (The emphasis is on substance, not fluff.) The app is all about bringing you the data you need to plan ahead with your cycle in mind, whether or not kids are in your future.

How the app works if…

You have irregular periods:

  • For cycles that average 21-35 days, even if there’s some variability cycle to cycle: During account setup, if you tell the app that your average cycle length is between 21-35 days — even if it varies in length from cycle to cycle — you will get cycle predictions on your calendar. This includes predictions for your fertile window and your 2 most fertile days. If you’re using the app with the Modern Fertility Ovulation Test, you’ll be able to power those predictions with your actual hormone levels.
  • For cycles that fall outside the range of 21-35 days: During account setup, if you tell the app that your average cycle length is longer than 35 days or shorter than 21 days, the app won’t be able to make predictions because your cycles are more likely to be anovulatory (aka without ovulation). That said, if you’re using the app along with our Ovulation Test, you’ll still be able to track your periods and see your surge on your LH curve. (That’s a great way to decode your cycle — even if it falls outside the 21-35 day range.)

You don’t get a period:

  • If you currently don’t get a period, you won’t see cycle predictions on your calendar since we use your previous cycle information to predict future periods and fertile windows.
  • You can still use the app to log your LH, see your LH curve, and record your period if you start menstruating again.
  • Even if you don’t get a period, you may still ovulate. LH testing + the app will help you figure that out.

You’re on birth control:

  • If you have a hormonal intrauterine device (IUD), copper IUD, or you’re on the minipill, implant, or shot and you get a period: You’ll be able to track your periods, log your LH and visualize your LH curve, and get smart predictions for future cycles. One important thing to note: You’ll still get information about your fertile window (the five days leading up to ovulation plus the day of ovulation itself) — but since you’re using contraceptives, it’s important to remember that your chances of getting pregnant are close to zero (which is possibly the reason you’re on contraceptives in the first place).
  • If you’re using the pill, ring, or patch: You won’t be able to see cycle predictions on your calendar. Why not? Those birth control methods work by suppressing ovulation — meaning you won’t have a period or fertile window to predict. That said, you’ll still be able to log your LH and see your LH curve.

What's next for the Modern Fertility App

The app is now available to download on iOS, but we’re just getting started. We’ll continue working hard to bring you everything you’re looking for in an app and to improve your cycle-tracking experience even more over time. If there’s anything you’d like us to add in a future update, send us a note at support@modernfertility.com. We’d love any and all feedback.

Ready to start tracking? Download the Modern Fertility App from the iOS App Store, tell us a few details about your cycle (like when you had your last period and your average cycle length), and *instantly* get calculated predictions for your next period and most fertile days.


P.S. The Modern Fertility App is currently only available on iOS. If you’re on Android, add your name to this list and we’ll reach out as soon as we know when we’ll be launching in the Google Play Store.

Shop the Modern Fertility Hormone Test

Did you like this article?

Dr. Sharon Briggs, PhD

Sharon leads Clinical Product and Research at Modern Fertility. She's a craft beer-loving, soccer-playing, cookie-baking scientist who completed her PhD in Genetics at Stanford University.

Join our community on Slack

This is a space for us to talk about health, fertility, careers, and more. All people with ovaries are welcome (including trans and non-binary folks!).

Recent Posts

How getting pregnant after brain surgery and fertility treatments transformed my idea of family

The Modern guide to vaginal bleeding

Which hormones impact your skin health? And how?

How irregular periods impact your ability to get pregnant

Modern Fertility's guide to HSAs and FSAs