Cycle calendar for iPhone and Android
Hi, I'm Luma
I'll help you understand your cycle: when your period is due, where that sudden energy comes from, and why some days feel like a lot.
Everything you tell me stays between us.
Coming soon to the App Store- No ads, no tracking
- Account optional
- Data encrypted on your phone
- Calm
- Cramps
- Happy
- Pelvic pain
- Energetic
- Ovulation pain
- Frisky
- Headache
- Focused
- Backache
- Sensitive
- Tender breasts
- Irritable
- Bloating
- Sad
- Acne
- Anxious
- Fatigue
- Mood swings
- Insomnia
- Tired
- Nausea
- Bleeding
- Cravings
- Discharge
- Constipation
- Sex and libido
- Diarrhea
- Tests
- Dizziness
- Measurements
- Hot flashes
- Sleep and water
- Joint pain
- Note
- Night sweats
- Vaginal dryness
- Brain fog
Try it without installing
Your first prediction in half a minute
This is how LumaSync starts. Answer Luma’s three questions and the same engine that runs in the app will calculate your prediction.
Step 1 of 3
When did your last period start?
I calculate in your browser. Nothing leaves this page and nothing is saved.
Today screen
One step ahead of your period
The most important number sits in the middle: how many days until your period. Below it, the date and an honest range, because cycles naturally vary, so a good prediction is a range, not a single day.
- 1
Days until your period
The same number waits on your home screen widget, so you do not even have to open the app.
- 2
An honest range
The more regular your cycles, the narrower the range. It can be wider at the start.
- 3
Where does this date come from?
One tap shows how many cycles the prediction is based on, how long they lasted on average and how much they varied.
- 4
Cycle phase
What is happening in your body today, in plain words and without scaremongering.
Daily log
Log how you feel
One day, one screen. Tap what fits and you are done. After a few cycles you will see what comes back before your period.
- Bleedingfrom spotting to heavy
- Mood11 moods to choose from
- Symptoms20 symptoms, from cramps to hot flashes
- Dischargehow it changes in your cycle
- Sex and libidojust for you
- Testspregnancy and ovulation
- Pill and medicationwith a reminder
- Measurementsweight and temperature
- Sleephow long and how well
- Waterglass by glass
- Notea few words about your day
- Your own tagsfor anything not on the list
Insights and tips
Your rhythm, your normal
Luma spots patterns that are easy to miss. She only compares you with you: your cycles and your average, with no tables of what is “normal”.
Example with demo data from five cycles
28.6
days
Average cycle
4
days
Average period
±1
day
Variation
28
days
Last cycle
Your cycles
- 7 August28
- 9 July29
- 10 June29
- 13 May28
- 14 April29
Symptoms by phase
- MenstruationMost often: tired, cramps, backache
- Follicular phaseMost often: energetic, happy, focused
- OvulationMost often: energetic, happy, focused
- Luteal phaseMost often: bloating, calm, sensitive
Tips for today
What is happening in your body on each cycle day, with a chart of the typical hormone curve. A report after every cycle, and for the symptoms you log, when they come back in your cycles.
EstrogenProgesterone
A typical textbook curve, not a measurement.
Symptoms cycle by cycle
How many days you logged each one in every cycle, oldest first. The last column is the cycle you are in now.
| 14 Apr | 13 May | 10 Jun | 9 Jul | 7 Aug | 4 Sept | |
|---|---|---|---|---|---|---|
| Energetic | 1 | 2 | 4 | 4 | 2 | 4 |
| Happy | 3 | 4 | 3 | 3 | 1 | 1 |
| Sensitive | 2 | 3 | 2 | 3 | 3 | 0 |
| Bloating | 3 | 2 | 2 | 2 | 2 | 0 |
| Calm | 2 | 2 | 2 | 2 | 1 | 1 |
Reminders and widget
Luma reminds you in time
Before your period, on its expected first and last day, for your daily log, your pill and other medication, weighing and drinking water. Your phone schedules them, not our server.
Discreet mode
On by default. Your lock screen then only shows “You have a new reminder”. Switch it off to see the details.
WidgetYour ring and the number of days on the home screen. In discreet mode it says “Your rhythm” instead of mentioning your period.
Monday 28 September
9:41
-
LumaSync
Period in 2 daysPrediction: 30 September. Good time to keep something at hand.
You have a new reminder.
-
LumaSync
A new cycle in a few daysLog your symptoms and mood. After a few cycles you will see what comes back before your period.
You have a new reminder.
-
LumaSync
How are you feeling today?A quick log helps you understand your cycle better.
You have a new reminder.
-
LumaSync
Drink some waterA glass of water is a good idea.
You have a new reminder.
Privacy
Everything stays between us
Your cycle is your business. LumaSync stores dates, symptoms and notes on your phone, encrypted, and without an account it sends them nowhere. We have no access to your cycle data and we never sell it.
Dark theme like an evening by candlelight
Encrypted on your phone
Every entry is encrypted with AES-256-GCM. The key sits in your phone’s secure storage, available only on that device.
Account optional
Want your entries on several phones? Sign in with Apple or Google. The backup is encrypted on your phone with a key we do not know, and the account does not know your name or email address.
No ads, no tracking
No ads and no third party advertising or analytics tools.
App lock
With biometrics or your phone passcode, for when someone else picks it up.
Discreet mode
Notifications without details and a widget that never mentions your period.
Your data, your call
Export to a JSON or CSV file at any time, and delete all your data with one button.
This website too: no cookies, no analytics and no third party scripts. Even the fonts come from our own server.
For every stage
One app, four modes
Switch at any time and Luma adjusts your predictions and reminders.
Cycle tracking
Period prediction, daily log, insights and reminders.
Trying to conceive
Log ovulation tests, temperature and cervical mucus, with reminders of your likely fertile days.
Pregnancy
The week of pregnancy and an approximate due date instead of a period prediction. After pregnancy, predictions return from your first period.
Perimenopause
Predictions with a wider margin, because cycles change.
Breastfeeding, living with PCOS or recently stopped hormonal pills? Mark it in your cycle settings and the prediction becomes more careful.
Share your cycle with someone close
Someone close will see your cycle day, phase and period prediction, and you decide whether they also see your mood and symptoms. The data is encrypted, so we cannot see it.
- No account needed on their side: the link you send them is enough. It works for 48 hours and only once.
- They will not see your log or notes. They only see what you choose here.
- You can stop sharing at any time with one button.
A report for your doctor
Your cycles and symptoms from the last year in a PDF to show your doctor. It is created on your phone, without your notes, and you decide who gets it.
Apple Health and Health Connect
If you turn it on, LumaSync saves your period and measurements in your phone’s health app and brings in data from other apps.
Switch without regrets
Already have a history in another app? LumaSync reads your periods from a Flo data file and your entries from a drip CSV file.
Speaks your language
English, Polish and Ukrainian. Light and dark theme, following your system or your choice.
Library
Get to know yourself
18 articles and 3 quizzes on your cycle, the days before your period, your body, sex, pregnancy and perimenopause. Every text was reviewed by three independent gynaecologists and lists its sources.
Reviewed by three independent gynaecologists
Cycle3 articles, 1 quiz
Days before your period3 articles, 1 quiz
Body changes3 articles
Sex and pleasure3 articles- Pregnancy3 articles
- Perimenopause3 articles, 1 quiz
-
Cycle
What cycle length is typical
Article2 min read
-
Days before your period
Painful periods: what can help
Article2 min read
-
Body changes
Skin and acne through your cycle
Article2 min read
-
Sex and pleasure
Desire for sex across the phases of your cycle
Article3 min read
-
Pregnancy
Folic acid before and during pregnancy
Article3 min read
-
Perimenopause
Your cycle in perimenopause: what is typical and what to check
Article2 min read
-
Cycle
The four phases of your cycle: what happens in your body
Article2 min read
-
Days before your period
Tension before your period: where the symptoms come from
Article3 min read
-
Body changes
Tender breasts before your period
Article3 min read
-
Sex and pleasure
Sex during your period
Article2 min read
-
Pregnancy
Late period: when to take a pregnancy test
Article3 min read
-
Perimenopause
Perimenopause: what it is and when it starts
Article3 min read
-
Cycle
Ovulation: when it happens and how to recognise it
Article2 min read
-
Days before your period
When it's more than PMS
Article2 min read
-
Body changes
Discharge through your cycle: what changes and why
Article3 min read
-
Sex and pleasure
Dryness and pain during sex: what can help
Article3 min read
-
Pregnancy
How pregnancy weeks and the due date are counted
Article3 min read
-
Perimenopause
Quiz: how much do you know about perimenopause?
Quiz5 questions
-
Cycle
Quiz: how much do you know about your cycle?
Quiz5 questions
-
Days before your period
Quiz: the days before your period
Quiz5 questions
-
Perimenopause
Hot flushes and night sweats: what can help
Article3 min read
FAQ
Questions and honest answers
Including the ones where the honest answer is “no”.
Will LumaSync tell me the exact day my period starts?
No. It shows the most likely date and a range, for example ±2 days, and explains where it comes from. Cycles naturally vary, so a prediction to the day would be a promise nobody can keep.
Can I rely on LumaSync to avoid pregnancy?
No. LumaSync is not a method of contraception and not a diagnostic tool. It is a calendar that helps you understand your cycle.
Do I need an account?
No. Everything works without one. An account with Apple or Google helps when you want the same entries on several phones or want to share your cycle with someone close.
Do my entries end up on your server?
Without an account, no. With an account, only a backup encrypted on your phone with a key we do not know goes there, so we cannot read it.
Are there ads or paid features?
There are no ads. Today there are no payments in the app either. The cycle calendar, period prediction, reminders, export and data deletion in LumaSync are free and ad free.
Does LumaSync work offline?
Yes. The calendar, daily log, predictions and reminders work without a connection. You only need the internet for Library articles and for your account.
Can I bring my entries from another app?
Yes. LumaSync reads your periods from a Flo data file and your entries from a drip CSV file. LumaSync’s own JSON export moves everything to a new phone.
Is there an iPad or desktop version?
No. LumaSync runs on iPhone and on Android phones with Android 8 or later. This website only introduces it.
Will LumaSync replace seeing a doctor?
No. But it can make the visit easier: show your doctor the PDF report with your cycles and symptoms from the last year. If something worries you, talk to a doctor or a midwife.
Where is LumaSync available and in which languages?
In the 27 countries of the European Union, in English, Polish and Ukrainian.
How do I delete my data?
You can delete all your data in the app settings. You can delete your account and its cloud backup in the app or on the account deletion page.
Who is behind LumaSync?
Axperts Dariusz Zalewski from Szczecin, Poland. Write to us at biuro@axperts.pl.
Nice to meet you
The cycle calendar, period prediction, reminders, export and data deletion in LumaSync are free and ad free.
Coming soon to the App StoreFor iPhone and Android phones, in the 27 countries of the European Union.