What Bluma for iPhone is
Bluma is a period and cycle tracker for iPhone. The store listing presents it as a private app: the developer name shown on the App Store is Trushalkumar Barvaliya, the category is Health and Fitness, and the page lists it as English-only. The listing says your records stay on the phone rather than in an online account.
This page is an independent, third-party guide. It is not written by the developer and it does not replace the App Store page. If anything here differs from the live listing, the listing wins.
A short but important note first. A cycle tracker is a diary with arithmetic attached. It is not medical advice, it cannot diagnose anything, and it is not contraception. The listing itself says that Bluma gives general wellness information based on what you log, that its predictions are estimates, and that you should talk to a healthcare professional about anything that concerns you. We agree with that wording and repeat it here.
What the store listing says it offers
Logging
The listing says you can log periods, flow, symptoms, mood, discharge, water, weight and basal body temperature. That is a wide set of fields for a free app. Not every user will want to record all of them, and you do not have to. A tracker is most useful when you log the few things you will actually keep up.
Calendar and predictions
The app shows a calendar with period days, a fertile window and an estimated ovulation day, and the listing says it predicts your next six cycles and updates them as you log. Predictions of that kind are normally extrapolated from your own previous cycle lengths, so the more consistent your cycles, the more reliable the forecast. See our explainer on how period trackers work for the general method.
Three modes
The listing describes three ways to use the app:
- Cycle, for everyday period tracking and predictions.
- Trying to Conceive, which puts the fertile window and ovulation day front and centre.
- Pregnancy, with week-by-week baby size and development and a due-date countdown.
Insights
The listing says the app reads your own logs and points out patterns: how regular your cycles are, which symptoms tend to cluster before a period, when the next fertile window falls, and how weight or basal temperature is trending. It states these are calculated on the iPhone and that nothing is uploaded to produce them.
Extra tools
The listing also names a water tracker with a daily goal, a birth control reminder with a streak, a contraction timer with 5-1-1 guidance, and achievements with logging streaks. It mentions an Apple Watch companion that shows your cycle day and next period. The 5-1-1 idea is a commonly cited rule of thumb for contractions (about five minutes apart, lasting about one minute, for about one hour), but your midwife or doctor gives the plan that applies to you.
Privacy features
The listing says data is stored on the device and not in the cloud, that an optional PIN or Face ID lock is available, and that you can reset or delete everything from the Profile area at any time.
Paid tier
According to the listing, a subscription called Bluma Premium unlocks every AI insight, the full period and symptom history, the cycle-length chart and the PDF health report, and removes all ads. The listing quotes monthly and yearly prices in Rupees. Prices vary by country and change over time, so read the current figures on the App Store page and in your Apple ID subscription screen.
How to use a tracker like this, step by step
- Install the app and read the privacy and data sections on the App Store page first.
- Choose the mode that fits your situation. If you are unsure, start with Cycle mode.
- Enter the start date of your last period. If you do not remember, enter your best estimate and expect the early predictions to be rough.
- Log the first day of every period and the last day. These two dates drive almost everything else.
- Add one or two optional fields, such as flow and mood, rather than everything at once.
- If you use a lock, set it up now so the data is protected from the start.
- After three or more cycles, look at the regularity figures and the pattern notes. Treat them as prompts for questions, not conclusions.
- Once a month, check that the logged dates are right. One wrong start date skews the next forecast.
Background: what the numbers mean
Cycle length is counted from the first day of one period to the day before the next. Many adults have cycles somewhere in the 21 to 35 day range, and it is normal for a given person to vary by a few days from month to month. Our guide to the phases of the menstrual cycle walks through the follicular, ovulation and luteal stages that a calendar like this is trying to model.
The fertile window is an estimate. Ovulation timing can shift with stress, illness, travel, sleep and many other things, so a calendar prediction can be off by days. Basal body temperature, which the listing says you can log, rises slightly after ovulation, which means it confirms ovulation after the fact rather than predicting it. That is why a calendar alone is a weak method for avoiding pregnancy.
Why a tracker is not contraception
Methods that depend on predicting fertile days work only with strict, consistent use and still have a notable failure rate in typical use. A phone prediction based on a calendar is less reliable than the structured fertility-awareness methods taught by clinicians. If preventing pregnancy matters to you, talk to a doctor, nurse or pharmacist about a method that fits you. The in-app birth control reminder, as the listing describes it, is a nudge for a method you already use, not a method in itself.
Privacy and permissions checklist
Health data is sensitive, so check these things yourself rather than relying on any summary, including this one.
- Open the App Store page and read the App Privacy section. It lists what data the developer says is collected and whether it is linked to you.
- Read the developer’s privacy policy, which the listing links to.
- Check what the app asks for when it first runs. Notifications are plausible for reminders; anything unrelated should make you pause.
- Decide whether you want an app lock, especially on a shared phone or a shared iCloud account.
- Find the delete-everything option before you need it, and test where the export or report goes.
- If you subscribe, remember that Apple handles billing and you can cancel in Settings under your Apple ID.
For a longer list, read our cycle tracking privacy checklist.
Red flags and honest limits
- Any app that promises to prevent or guarantee pregnancy. Trackers cannot.
- Claims of diagnosing conditions such as PCOS or endometriosis from logged data. Only a clinician can do that.
- Requests for unrelated permissions or for your full contact list.
- Premium pressure that hides the free features you were using.
- Sudden changes in your cycle that you try to explain with the app instead of a doctor. Our page on irregular cycles and when to see a doctor lists common reasons to book an appointment, such as long gaps between periods, very heavy bleeding or severe pain.
Who it suits and who should look elsewhere
It may suit you if you want a single app for periods, symptom notes and, later, conception or pregnancy tracking, and you prefer local storage over an online account. The Apple Watch glance and the lock options are practical extras for iPhone users.
You may want to look elsewhere if you need an app in a language other than English, if you want cloud sync between devices, or if you need a clinically validated tool. The listing says English only and says data is kept on the device, which also means that if you lose or reset the phone without a backup you could lose your history. Check how backups work before you rely on years of data.
If you track mainly to prepare for appointments, a simple note of dates and symptoms may do the job; see our PMS symptom tracking tips for what is worth writing down.
Common questions
Will the predictions be accurate?
They will be as accurate as your cycle is regular. With irregular cycles the forecast can be well off. The listing itself calls the predictions estimates.
What happens to my data if I delete the app?
The listing says data is stored on the device. Deleting an app normally removes its local data, so export or back up anything you want to keep first, and check the developer’s policy for specifics.
Is Premium necessary?
Not necessarily. The listing describes the free app as covering logging, the calendar and predictions, with Premium adding extended history, charts, reports and AI insights. Try the free version for a few cycles before deciding.
Can I use it during pregnancy?
The listing describes a Pregnancy mode with weekly development and a countdown. Treat it as general reading. Your antenatal care team decides dates and care, and an app should never override them.
Where to go next
- Browse our health topic hub for more guides.
- Compare similar tools in the apps directory.
- Read how period trackers work before you trust any prediction.
- Always read the live App Store listing, the privacy section and the developer’s policy before you enter personal health data.
