Period Tracker and Calendar

Review by eFreeware

Keeping a useful record of a menstrual cycle is harder than it sounds. Dates get forgotten, symptoms blur together, and the patterns that matter only become visible when months of information sit in one place. That is the gap a calendar-based tracker is meant to close, and it is the job Period Tracker and Calendar sets out to do.

The app comes from SimpleInnovation and sits in the Medical category on Google Play. It has been available since August 2015 and has passed 10 million installs, with a 4.9 average across more than 558,000 ratings. It is free to download, carries ads and offers in-app purchases.

The developer positions it as more than a period log. Alongside cycle predictions, it covers ovulation and fertility, pregnancy, PMS symptoms and perimenopause, and it is registered as a CE Class I Medical Device in the EU. That combination of breadth and a medical-device designation is what makes it worth a closer look.

What the cycle predictions actually do

A calendar sits at the center of the app, covering periods, cycles, ovulation and fertile days. From the health data you enter, it generates predictions for upcoming periods and ovulation, and it can also be used to monitor irregular cycles and hormonal changes over time.

The calendar view is where those predictions become readable. Days are marked as non-fertile, fertile, ovulation, expected period or period, so a single glance shows where you are in the current cycle and what is likely coming next. That kind of visual layering is more useful than a plain list of dates, especially when you are trying to see how regular or irregular things have been.

For anyone whose cycles do not run like clockwork, there is room to adjust the prediction intervals rather than accept a fixed estimate. The luteal phase length can also be customized, and cervical observations can be logged for fertility awareness. Those are the settings that separate a tracker built for irregular cycles from one that assumes a textbook 28-day pattern.

It is worth repeating what the developer states plainly: predictions are estimates based on what you enter and on natural biological variability. The app is not a diagnostic tool, and it should not be relied on as the only method of contraception or pregnancy prevention.

Symptom logging beyond the calendar

A date on a calendar tells you when a period started. It does not tell you that you slept badly, felt low, had cramps or changed medication that month. Period Tracker and Calendar handles that side of things with a logging system covering more than 100 health indicators and reproductive symptoms.

The developer's list covers PMS and cramps, mood and emotions, how heavy the flow is, weight, temperature, medication and birth control, plus sleep and energy. There is also room for notes, activities and wellness habits. Over several cycles, that mixture of data is what allows the app to surface patterns and hormonal trends rather than isolated events.

There is also a section for perimenopause and hormonal transitions, covering hot flashes, mood swings, sleep changes, irregular periods and shifts in energy and emotional wellbeing. Building it in gives the app a longer useful life than a tracker aimed only at women trying to conceive or avoid pregnancy.

The app tracks reproductive and hormonal health across life stages. How much insight you get will depend on how consistently you log, which is true of any tracker.

Pregnancy mode and weekly updates

When a pregnancy begins, the app can be switched into Pregnancy Mode. From there it follows the pregnancy week by week, with updates on baby development and milestone tracking as the months pass.

Body changes and pregnancy symptoms can be logged in the same way as cycle symptoms, and the developer includes pregnancy insights and tips alongside the tracking. There are also pregnancy-specific themes and a dedicated pregnancy calendar, so the interface shifts with the mode rather than staying fixed to a cycle view.

One practical touch is the ability to generate reports to share with a doctor. Rather than trying to recall details during an appointment, you can bring a record of what you have logged. For anyone whose pregnancy involves regular medical checkups, that is a genuinely useful feature rather than a decorative one.

Reminders, privacy and personalization

Tracking only works if you remember to do it, which is where the reminder system comes in. The app sends discreet notifications for periods, ovulation and the fertile window, plus reminders for medication. Keeping those alerts low-key matters for anyone who would rather not have cycle information appear in front of other people.

Password protection, backup and restore, and transfer to a new device are all included. Those three together matter more than they might appear: a tracker is only as good as its continuity, and being able to move years of logged data to a new phone without losing it is the difference between a long-term record and a fresh start.

Personalization extends to color themes, a dark mode, flexible regional settings, adjustable units and a choice of which day starts the week. None of these change what the app does, but they make daily use more comfortable, and small mismatches in things like units or week start can be surprisingly irritating over time.

There is also a Simple Mode that hides ovulation and fertility features and focuses only on period tracking. The developer suggests it for teens and for anyone who wants a cleaner experience without fertility data on screen.

What the app asks of you

Period Tracker and Calendar is free to download, and it contains ads and offers in-app purchases. Anyone considering it should go in knowing that both are part of the package.

The bigger requirement is your input. The app processes health data that you enter yourself, and its predictions are built from that data. The developer is explicit that the estimates reflect natural biological variability, so the value you get out is closely tied to what you put in. If you log irregularly, the predictions will be correspondingly rough.

There is also a medical boundary to respect. The app offers no diagnosis or medical advice, and is not meant to stand in for a doctor's opinion. It is not a form of contraception, nor a way to prevent pregnancy, treat fertility or diagnose a condition.

The app was last updated in September 2026, with the developer noting performance improvements, fixes for issues reported by users and an invitation to send feedback.

Getting useful results from it

The most reliable way to get something out of a tracker like this is to log a few things every day rather than everything occasionally. Flow, mood and sleep are quick entries; body temperature and cervical observations reward consistency more than volume, since they are the kind of data that only makes sense as a series.

If your cycles are irregular, the adjustable prediction intervals and the luteal phase setting are the first places to look. Leaving them at default values while your cycle does something else is a recipe for predictions that never quite match reality. Adjusting them is not complicated, but it does require knowing roughly how your cycle behaves.

Anyone who finds the full feature set overwhelming can switch on Simple Mode and work with period tracking alone. It is a reasonable starting point, and the fertility features remain available if you decide you want them later. For pregnancy, moving into Pregnancy Mode keeps the log continuous rather than starting a separate record.

It also helps to decide early what you want from the app. Someone charting fertility awareness will use very different parts of it than someone tracking perimenopause symptoms or documenting a pregnancy for medical appointments. The app covers all three, but no one uses all of it at once.

A detailed tracker for long-term use

Period Tracker and Calendar is a broad, well-established cycle tracker rather than a single-purpose period log. The combination of cycle predictions, more than 100 trackable indicators, pregnancy mode and perimenopause support means it can follow someone through several distinct stages without a change of app. The CE Class I Medical Device registration and the clear statements about what the app is not add a level of seriousness that suits the subject.

The trade-offs are straightforward. It is free but ad-supported and includes in-app purchases. It asks for consistent input to be useful, and its predictions are estimates rather than certainties. The developer is upfront about both the variability and the limits of what the app should be used for.

I would suggest it to anyone who wants a detailed, customizable record of their cycle and related symptoms, whether the goal is understanding irregular periods, planning or avoiding pregnancy, tracking perimenopause, or documenting a pregnancy. With a 4.9 average from more than half a million ratings and over 10 million installs, it is clearly a familiar choice. For someone who wants nothing more than a quick note of when a period started, Simple Mode covers that too.

What's new in version 13.2.0

✓ App performance has been improved. ✓ Minor issues reported by users were fixed ✓ Please send us your feedback!