Eluna Cycle: Period Tracker

No subscription, no paywall, no account. Every feature is unlocked from launch, and your cycle stays encrypted on your phone.

No subscription. No ads. No paywall. No account. No server that could leak your cycle.

Eluna Cycle forecasts your period, ovulation and fertile window — and every forecast carries how confident it is, because a prediction that pretends to be certain isn't a prediction.

YOUR MOON RING One ring shows the day of your cycle, the phase you're in and the countdown to what comes next, inside a halo that widens when the forecast is less sure. Around it, a daily note on your skin, energy, body, mood and libido for exactly where you are.

FORECASTS THAT SHOW THEIR WORK • Period, ovulation day and peak, and a fertile window of up to six days • An 80% confidence interval on ovulation instead of one falsely precise date • Conception chance for today, in plain language • Late-period detection that escalates gently and pauses forecasting rather than guessing • Unusual cycles are detected and set aside, so one strange month doesn't drag your averages • Accuracy climbs as you log — a Bayesian mod

TRYING TO CONCEIVE Switch to Plan Pregnancy and log the biomarkers that actually move the forecast: basal body temperature in °C orLH test results, cervical mucus from dry throy tests. LOG WHAT MATTERS TO YOU Flow from spotting to heavy, cramps, mood, sleep, energy, skin and hair, headaches, sex and libido, medication, lifestyle. Notes up to 1000 characters a day.nd categories when ours don't fit.

SEE THE PATTERN Flow dynamics, cycle consistency, a symptom heatmap across cycle days, mood distribution by phase, and your CPassport. When something keeps returning, Eluit with the clinical evidence class behind theexplanation.

PRIVATE IN A WAY YOU CAN VERIFY • No account, ever. There is no Eluna server • No ads, no analytics, no third-party trackers — nothing on your phone measures what you watch, tap or log • Every health field is encrypted at rest on e database file • PIN and Face ID lock, plus a cover that hides the app in the multitasking switcher • Ghost Mode: notifications that reveal nothir medication • Delete everything, irreversibly, in one tap

SYNC ONLY IF YOU WANT IT Off by default. When you switch it on, your dhone with your own password before it leavesand lands in your own iCloud. Apple sees ciphertext. We see nothing, because there is nothing of yours for us to see.

FOR YOUR DOCTOR Export a medical cycle report as PDF or CSV —of last period, cycle history, symptom trendsand your notes — password-protected if you want it to be.
REMINDERS THAT FIT Period forecast 1 to 3 days ahead, fertile wiedication and vitamin schedules (daily, lutealphase only, or a fixed course), and an evening nudge when the day is still unlogged.
PRICE, PLAINLY Free — and now completely ad-free. No subscriner. Everything is unlocked from the firstlaunch: every theme, all seven app icons, custom symptoms and categories, the clinical library, the doctor's report, encrypted sync. If Eluna has earned a place oe a small optional tip to support development — it unlocks nothing, it's simply a thank-you. That is the entire business model. Nothing about your own cycle is ever held behind a paywall.

Eluna Cycle is not a medical device and not aIt forecasts; it does not promise. Talk to aclinician about anything that matters.