Made by a woman, for women

The cycle and pregnancy app that takes you seriously.

Cyelle is a cycle app that calculates your period, fertile days and ovulation transparently and explains them calmly. If you become pregnant, it keeps you company week by week, without ads.

Try it free for 3 days. Then a monthly or yearly subscription, both modules included.

Cyelle in pregnancy: home screen in week 18 with this week's drawing

Cyelle in the cycle module: home screen on cycle day 10, the fertile window begins soon

No ads no ad SDK in the app
No data sales not shared for advertising
Two modules, one subscription cycle and pregnancy
45 languages for iOS and Android

Why Cyelle

Clearly calculated, calmly explained.

No little flowers, no ads, no false certainty. You see how things are calculated, and the decisions stay with you.

Calm, not pink

Dark blue, plenty of white, clear type. No pink clichés and nothing cutesy. Cyelle talks to you like the grown woman you are.

Time windows and predictions

You see your fertile days as a time window, ovulation and your next period as a prediction. Cyelle also always shows your due date with a time window.

Calculates with your rhythm

From three recorded cycles on, Cyelle calculates with your own cycle length. If your cycle varies, you see it in the statistics and in how reliable the prediction is.

Open calculations

The period prediction shows how many cycles it is based on. For your due date, Cyelle names the formula it used.

How Cyelle calculates ↓

You read it yourself

You read your ovulation test yourself. Cyelle saves every reading, several a day too. A confirmed positive test aligns your ovulation day. No photo.

Your data stays yours

Cyelle is funded by subscriptions, with no ads and no ad SDK. Your data is not sold and not shared for advertising. You can delete it yourself in the app.

Why Cyelle exists

I wanted a cycle app that doesn't feel like it was built by a man who has never had a period.

No man has ever taken an ovulation test day after day, waited anxiously for a pregnancy test or felt what a cycle really feels like. To me, many period apps felt pink, playful and far removed from that everyday life. That's why I founded Cyelle. Calm, honest and grown-up, without ads and with calculations you can follow.

Milena BartonFounder of Cyelle

How Cyelle calculates

Every prediction has a calculation.

You should see where a number comes from. These are the rules Cyelle uses to calculate fertile days, ovulation and your due date.

All values are calculations. Cyelle is not a contraceptive and does not provide diagnoses.

Time window

Fertile window

Calculated from your cycle length and shown as a time window. The ovulation day within it is marked as a prediction.

from 3 cycles

Your cycle length

From three recorded cycles on, the prediction uses your own cycle length. Next to it you see how reliable the prediction currently is.

positive test + 1 day

Your ovulation test

You enter what your test shows. If you confirm a positive result, Cyelle sets the expected ovulation to the following day and aligns the window with it.

period + 280 days

Your due date

Using Naegele's rule from your last period, adjusted to your cycle length if your cycle is regular. With a positive ovulation test, Cyelle calculates from ovulation. Always with a time window.

Understand your cycle

Your cycle, clearly explained.

The home screen shows where you are in your cycle. After ovulation, Cyelle counts the days as DPO 1, DPO 2 and so on. You find all your entries in one place.

Cycle day and phase at a glance, every day after ovulation explained, up to the test
Symptoms, mood, digestion with multiple choice, collected in “My entries”
Statistics for your cycles and suitable tests when you need them

Cyelle cycle app: home screen on cycle day 10, the fertile window begins soon

TodayCycle day 10 Your fertile window begins soon

Fertility and trying to conceive

Fertile days and ovulation as a time window.

Cyelle calculates your fertile window and expected ovulation from your cycle data. If you confirm a positive ovulation test, both align with it.

6Thu

7Fri

8Sat

9Sun

10Mon

11Tue

12Wed

13Thu

14Fri

fertile windowPrediction: ovulation

Log ovulation tests, strips or Clearblue digital, several times a day
Next period as a prediction, with how reliable it currently is

Prediction: next period, fertile window, expected ovulation and reliability

Next periodin 10 days expected Tue, August 25

Pregnancy

Your pregnancy, week by week.

After a positive pregnancy test, Cyelle calculates your week of pregnancy and due date from your cycle data and names the formula. The date from your doctor or midwife is what counts, and you can enter it.

Week of pregnancy on the home screen and every week in detail, with approximate size
Contraction tracker and kick counter, time contractions with duration, interval and history
Prenatal care roadmap with recommended check-ups and your own appointments

Cyelle pregnancy app: home screen in week 18, trimester 2, with today's entries

CalculatedWeek 18 +3 days · Trimester 2

Day by day, week by week

A drawing for every stage.

Every day from DPO 1 to DPO 15 has its own drawing and explains what could happen if you are pregnant. During pregnancy, a drawing with the approximate size follows every week, up to week 40.