Menstrual cycle apps: what each one does best

Before the comparison, a warning that changes how this list should be read: None of these apps detect pregnancy.. They are all menstrual cycle trackers, and what they do is record dates, predict the next menstruation, estimate the fertile window, and track symptoms. Confirmation of pregnancy depends on a urine or blood test.

Once registered, they are genuinely useful — including for knowing when Take the test. Below, what each one does best and who it's best suited for.

How to compare cycling apps

Four criteria matter more than the store rating:

• Quality of the forecast with an irregular cycle. With a regular cycle, everyone gets it right. The difference appears in the irregularity.
• What the free version offers. Many save reports and analyses for the paid plan.
• Privacy. Cycle data is health information. Password protection, control over what is shared, and the option to export and delete should be the minimum requirements.
• Symptom log. Variety of fields and ease of recording every day — that's what determines whether you'll keep the habit.

Flo

It is the best known in its category, and the most comprehensive in educational content. It covers menstruation, trying to conceive, and pregnancy monitoring in different ways, with a large library of peer-reviewed articles.

The symptom log is the most detailed in the group, and the forecast adjusts as you accumulate data. Many of the more in-depth reports are available in the paid plan, but the essentials—forecast, calendar, and log—are in the free version.

It also offers anonymous mode and access blocking, which is important in an app of this type.

For whom: For those who want the most complete package and value explanatory content along with registration.

Clue

A clean interface, without childish aesthetics, and a more data-driven than advice-driven approach. It was developed with the participation of researchers and is transparent about its forecasting methodology.

The strong point is the clarity in presenting the history: graphs that show the variation in cycle length over the months, which is particularly useful for those who have irregular periods and want to bring this information to a consultation.

The privacy policy is one of the most explicit in the industry, detailing what data is collected and for what purpose.

For whom: Those who prefer numbers and graphs to advice, and those who want organized material to investigate irregularities.

My pregnancy and my baby today

This one is in a different category: it starts after confirmation. It follows the pregnancy week by week, explaining what happens in each phase, providing a calendar of appointments and exams, and recording weight and symptoms.

It makes sense to install it when there's already a positive result—not before. As an organized prenatal tool, it fulfills its purpose well, and the weekly content helps you arrive at your appointment knowing what to ask.

For whom: For those who have already confirmed their pregnancy and want organized prenatal care until delivery.

Which none of them do

• Detect pregnancy. There is no sensor in the cell phone that interacts with hormones. The prediction is arithmetic based on the dates entered.
• To serve as a contraceptive method. Fertility awareness methods exist, but they require formal training and daily observation—not calendar-based averaging.
• Detect ovulation. They estimate it from the average. Confirmation requires an LH test or daily measured basal body temperature.
• To diagnose any condition. They can point out irregularities and suggest seeking evaluation, which is already quite a lot — but the diagnosis comes from the consultation.

How to use it to find out the test time.

This is the most practical app of all. Record the first day of each period for a few months. When the app indicates a delay, it will accurately tell you how many days have passed since the expected date.

Starting from first day of delay, The urine test is reliable — use the first urine of the day. Negative result with continued delay: repeat in three to five days. If more than two weeks have passed with a negative test, it's worth seeking evaluation, as there are other causes for a missed period.

Pregnancy tests are free at basic health units within the Brazilian public health system (SUS), without the need for a doctor's referral, and with confidential service.

Regarding privacy, before installing

Check three things in any of them: whether it allows password or biometric locking, what is shared for advertising or research, and whether you can export and delete your data. This is health information, and it deserves the same care you would give to a medical exam.

SEE MORE:

• What cycling apps actually calculate.
• Pharmacy pregnancy test: how to do it and when to do it
• Pregnancy test with privacy: where to do it for free

Criteria that are worth more than the list of features.

After installing two or three, it becomes clear that the difference between cycling apps is rarely in the calculations—they all use the same calendar arithmetic. The difference lies in how they handle your history, how much they interfere with daily use, and how easy it is to switch off. These three factors should determine your choice.

• Actual exportsLook for an option that generates a file with your dates. Without it, switching applications means starting from scratch.
• Use without connectionIf the app calculates offline, the processing happens on the device, which reduces the exposed surface area.
• App weightA diary of dates doesn't justify hundreds of megabytes; bloated installers often point to advertising and tracking libraries.
• ad frequencyFull-screen ads that appear with every tap will make you abandon the daily log, and without a daily log the app is useless.
• Consistent permissionsStorage and notifications are sufficient; contacts, SMS, microphone, and location are irrelevant here.
• Objective data policyYou have to say what you collect, who you share it with, and how long you keep it — in plain Portuguese and without beating around the bush.

How to test two apps at the same time without getting lost

Parallel testing is the most honest way to choose, but it requires a minimum of method to avoid generating two incomplete histories that are useless for both purposes.

• 1. Choose a cutoff date and enter the same start date for the last flow in both applications.
• 2. Fill in both with the same three previous cycles, if you have that information noted down.
• 3. Leave the notification active on only one of them, so you don't receive duplicate alerts and end up ignoring both.
• 4. Use both for two complete cycles; less than that makes no difference.

Uninstalling does not delete what has already been sent to the server. If the discarded application had an account, go into its settings and use the option to delete the account before removing it; if this option is not available, requesting the deletion of data processed based on consent via email to the developer is legally supported, because Brazilian law gives the data subject the right to demand the deletion of data processed based on consent.

Where they all bump up at the same limit.

Although the interface may vary, the engine is the same, and so are the limitations. No cycle tracking app detects pregnancy, confirms ovulation, or functions as a contraceptive method. What exists is a calendar estimate built on the average of your previous cycles, and this estimate shifts with stress, travel, changes in sleep patterns, illness, weight fluctuations, and medication use.

And it's worth repeating the essential point: pregnancy confirmation depends on detecting the hCG hormone. This happens with a urine test bought at a pharmacy or a beta-hCG blood test, which is free through the public health system. No combination of symptoms recorded on a cell phone can replace this measurement.

What the phone's operating system already offers before any installation.

On iPhone, the Health app has built-in cycle tracking, with dates and symptoms stored within the system. On Android, Health Connect centralizes health data and shows, on a single screen, which apps can read and record each category—allowing you to revoke this individually, which is more practical than hunting for the setting within each program.

For those who simply don't want to miss the date, the native calendar with recurring events and reminders solves the problem without sending anything anywhere. And both systems allow you to hide the content of notifications on the lock screen and protect specific apps with biometrics, which is what truly ensures discretion in everyday use.

Common questions when choosing

Vale manter mais de um aplicativo instalado em definitivo?

It's not worth it. Two parallel records end up diverging because in some months you write something in one and forget about the other, and from then on both forecasts are wrong. Choose one, export the history from time to time and keep only that one.

Perco meu histórico se trocar de celular?

If the app uses an account, the history will be restored when you log into the account on the new device. If it saves everything locally, you need to export it beforehand or rely on the system backup. Exporting before switching devices is the only way that doesn't depend on luck.

Posso usar o aplicativo para evitar gravidez?

No. The calendar method alone has a high failure rate, and the app doesn't change that; it just presents the bill in a nicer way. Contraception is decided in consultation, and most methods are distributed free of charge in the public health system.

Read also

• Ultrasound apps: what are these apps really?
• Ultrasound via mobile phone: why no app does it.
• Listening to your baby's heartbeat through your cell phone: why it doesn't work
• Pregnancy symptoms: why they don't confirm anything on their own.