What this app is
Bluma: Period and Cycle Tracker is an Android app listed on Google Play under the publisher name Bluma AI Technologies, in the Health and Fitness category. The short tagline on the listing calls it a period tracker and ovulation calendar with cycle predictions and a pregnancy mode. This is an independent guide. We are not the developer, and the Google Play page is the authority on what the app does today.
Please read this first: a tracker records what you tell it and does sums on it. It is not a medical device, it does not diagnose anything, and it is not contraception. The listing says so in its own closing notice, and so do we.
What the Google Play listing says, feature by feature
The listing is organised into several themed blocks. Here is a plain summary of each.
Period tracking and calendar
- Log period days, flow, cramps, other symptoms, mood, sleep and weight.
- Period predictions built from your own logged cycles.
- A calendar showing cycle day, cycle length and averages.
- Cycle history and regularity, so changes over time are visible.
- A home-screen widget for cycle day and the next predicted period.
- Period reminders.
The widget is a practical detail on Android: you can see the cycle day without opening the app, though that also means anyone glancing at your home screen can see it. Decide whether that suits you.
Ovulation and fertility
The listing mentions an ovulation calculator with an estimated ovulation day, fertile-window predictions, basal body temperature logging, ovulation test (OPK) result logging, a Trying to Conceive mode that highlights estimated best days, and fertility and ovulation reminders. Home ovulation tests detect a hormone surge that usually comes shortly before ovulation, so logging them alongside temperature gives a fuller picture than a calendar alone.
Pregnancy
There is a pregnancy section with week-by-week development, a due-date countdown, a trimester overview, a kick counter and contraction timer for later weeks, and symptom notes you can bring to prenatal visits. A note like “headaches in the evening, twice this week” is more useful to a midwife than a vague memory.
Insights
The listing says the app shows how symptoms and mood line up with each cycle phase, draws PMS and phase patterns from your history, gives a gentle heads-up when a cycle looks unusual, and presents honest ranges rather than false certainty. It says insights are calculated on the device.
Reminders and daily tools
Period, fertile window, ovulation and daily pill reminders, a water tracker, a weight log, a birth control pill reminder, and streaks and achievements.
Privacy as described
- Data kept in an encrypted database on the device.
- Optional PIN or fingerprint lock.
- Cloud backup optional and off by default.
- Optional partner sharing, read-only, via a code you choose to share.
Premium
The listing says Premium unlocks the full AI Insights experience and removes ads, with subscriptions renewing automatically until cancelled, and cancellable in Google Play. The listing text we reviewed gives no price, so check the in-app and store pricing yourself.
Setting up sensibly
- Before installing, open the Data safety section on the Play page and read what the developer declares about collection and sharing.
- After installing, deny any permission that is not needed for a feature you plan to use. Notification permission is reasonable if you want reminders.
- Turn on the PIN or fingerprint lock first, before entering anything.
- Enter your last period start date, then the typical cycle length if you know it.
- Keep cloud backup off at first. If you later enable it, understand where the backup lives and how to delete it.
- Only create a partner code if you actually want someone else to see your data, and know how to revoke it.
- Log for at least three cycles before judging the predictions.
Background that helps you read the screen
A calendar shows a forecast, not a fact. Cycle length is measured from the first day of a period to the day before the next. Variation of a few days is normal for many people, and stress, illness, travel, breastfeeding, some medicines and life changes can all move it. Our article on how period trackers work explains the averaging behind most predictions, and the phases of the menstrual cycle guide explains why mood and energy change through the month.
If the app flags a cycle that looks different, treat that as a prompt to look at your own notes. A single odd cycle is common. Repeated gaps, very heavy bleeding, severe pain or bleeding between periods are reasons to see a clinician; our page on irregular cycles and when to see a doctor lists the usual signs.
Why predictions are weaker than they look
An estimated fertile window is built from averages. Your own ovulation can arrive earlier or later than the average, and sperm can survive for several days, which is why calendar-based timing is unreliable for avoiding pregnancy. The listing is explicit that Bluma must not be used for that purpose. Conversely, if you are trying to conceive, the highlighted days are a starting point and not a guarantee, and a doctor can advise if conception takes longer than expected.
Privacy and permissions checklist
- Does the Data safety section match what the listing says about on-device storage?
- Is the lock enabled, and does it protect the app when you switch away from it?
- Is cloud backup off unless you chose it?
- Do notifications show sensitive wording on the lock screen? Change this in Android settings if others can see your phone.
- Does the home-screen widget reveal more than you want?
- Can you find the delete-my-data option and the developer’s contact details?
Our cycle tracking privacy checklist goes further, including advice on what to do if you live somewhere where reproductive health data could be sensitive.
Red flags
- Promises to prevent pregnancy, or to “guarantee” a fertile day.
- Any claim that the app can diagnose a condition.
- Aggressive paywalls that block data you already entered.
- Requests for permissions that have nothing to do with tracking, such as contacts or SMS.
- A partner code you did not create.
Who it suits and who should look elsewhere
It may suit you if you want one Android app that covers periods, ovulation, pregnancy and daily extras such as water and weight, with optional sharing for a partner and a home-screen widget. The emphasis on ranges instead of precise claims is a good sign in this category.
Look elsewhere if you need a clinically validated tool, if you want no ads at all without paying, or if you do not want any cloud or sharing features present in the app. If you track mostly symptoms before your period, a lighter note-taking approach plus our PMS symptom tracking tips might be enough.
Common questions
Are the predictions personal to me?
The listing says predictions are built from your own logged cycles, so they start rough and improve with more entries.
Can I stop the ads?
The listing says Premium removes ads. Free use is described as ad-supported, so expect some.
What if the app disagrees with my doctor?
Follow your doctor. The app is a diary with calculations, and its own notice says it must not replace professional advice.
Where to go next
- The health topic hub collects our related guides.
- Browse similar tools in the apps directory.
- Read the live Google Play listing and the developer’s privacy policy before you log anything personal.
