Private Period TrackerYour cycle stays on your phone.
A complete period & cycle tracker that works fully offline, needs no account, and encrypts everything on your device. No ads, no trackers, no data sold — ever.
Everything you'd track — nothing you'd have to give up.
Private Period Tracker matches the full feature surface of the big cloud apps, then re-engineers it so the core runs entirely on your phone.
Log your period and how you actually feel.
Mark period start and end on any day, set flow intensity, and capture the full picture — over 70 symptoms, moods, discharge, sex, sleep, cravings, tests and more.
- Flow & symptomsSpotting to heavy, cramps, headaches, bloating, mood, energy and dozens more.
- Tests & measurementsLH and pregnancy tests, basal body temperature, weight, sleep and water.
- Quick logCapture today in a couple of taps, then rearrange the trackers you care about.
Predictions that are honest about uncertainty.
See your next period, fertile window and estimated ovulation — each shown as a range that narrows as you log more. When the model isn't sure, it tells you, instead of pretending.
- Next period & fertile windowCalendar-anchored predictions with a confidence level in plain language.
- Cycle day & phaseAlways know where you are: menstrual, follicular, fertile or luteal.
- Irregular-cycle awareRanges widen for irregular cycles and explain why — no false precision.
Spot your patterns — and hand your clinician the facts.
Average cycle and period length, variability, and symptom patterns by phase. Generate a clean summary for your doctor without a single byte leaving your phone.
- Cycle statisticsLength, variability and regularity against clinical reference ranges.
- Symptom-by-phase patternsSee how mood, skin and energy track with your cycle over time.
- Clinician summaryExport recent cycles and top symptoms as a shareable report you control.
From first period to perimenopause.
Switch modes as life changes. The interface, predictions and content adapt — all on the same private, on-device foundation.
Fertility and a full week-by-week pregnancy.
In TTC mode your fertile window and daily conception odds move front and centre. Expecting? Follow every week with baby development, size comparisons, body changes and tools.
- Fertile window & ovulationLH-test and temperature aware, with daily low/medium/high conception odds.
- Week-by-week pregnancyDevelopment notes, fruit-size comparisons, tips and a due-date countdown.
- Kick & contraction toolsKick counter, contraction timer and an appointment checklist for later weeks.
Make sense of cycles that won't sit still.
Perimenopause mode tracks lengthening gaps and rising variability, scores your symptom burden, and widens predictions honestly instead of guessing at a date it can't know.
- Symptom-burden scoreTrack hot flashes, sleep and mood changes as they build over time.
- Irregularity timelineA clear view of how your cycles are changing month to month.
- Four modes, one tapCycle, trying to conceive, pregnancy and perimenopause — switch anytime.
Private because of how it's built — not a setting you have to trust.
Most trackers keep your reproductive data on their servers and ask you to trust a policy. We keep it on your phone and give you nothing to opt out of.
Encrypted on your device
Everything lives in a local database encrypted with SQLCipher (AES-256). No cloud copy exists by default.
No account, no email
Open the app and start tracking. There's no sign-up, so there's no profile to breach, subpoena or sell.
An assistant that never phones home
Ask about your cycle and get answers from a model that runs on the phone. Your questions never leave it.
End-to-end encrypted
Turn on sync or partner sharing and the server only ever sees ciphertext it cannot read. Off by default.
You can export everything (JSON, CSV or text), back it up with your own passphrase, or erase every trace — local and any opt-in cloud copy — in a single, deliberate tap.
A closer look at everything inside.
Core tracking, predictions, privacy tools and life-stage modes are free. Advanced insights and the on-device assistant come with Plus; connected features are always optional.
Smart calendar
Scrollable months marking logged and predicted periods, fertile window and ovulation, with non-colour cues for accessibility.
Cycle insights
Averages, variability and regularity, plus symptom and lifestyle correlations across your history.
Reminders
Period, fertile-window, pill, hydration and log-your-day reminders — all scheduled locally, with quiet hours.
Learn library
Original, non-diagnostic articles on cycles, fertility, pregnancy and perimenopause — read entirely offline.
On-device AI assistant
Ask cycle and health questions in plain language. Runs on the phone, works offline, cites nothing to the cloud.
App lock
Fingerprint, Face unlock or a PIN, with lockout backoff and an optional discreet app icon.
Partner sharing
Share only what you choose — current phase, next period, pregnancy progress — end-to-end encrypted to your partner.
Export & backup
Own your data: passphrase-protected backups and JSON, CSV or plain-text exports, whenever you want.
Home-screen widget
Cycle day, phase and countdown at a glance, hidden until you unlock when app lock is on.
Health Connect
Optionally read and write menstruation, temperature, weight and sleep with Android Health Connect.
Pseudonymous community
Opt-in, moderated discussions where your health data is never attached to anything you post.
Multi-device sync
Optional, end-to-end encrypted sync across your own devices — the server stores only what it can't read.
The privacy the others charge you for — or can't offer.
Core tracking is free. Forever.
No ads paying the bills, no data sold on the side. Pay once for Plus if you want more — or never pay at all.
Everything you need to track your cycle privately.
- Full logging, calendar & predictions
- On-device encrypted storage
- App lock, widget & reminders
- Export, backup & delete
A single purchase unlocks the advanced experience — no subscription.
- Everything in Free
- Advanced insights & clinician export
- On-device AI health assistant
- Full pregnancy & perimenopause modes
- 30-day trial of online services
Optional. Only if you want encrypted sync and connected features.
- End-to-end encrypted multi-device sync
- Encrypted partner sharing
- Streamed content library
- Pseudonymous community
Purchases and subscriptions are handled by Google Play billing. Local and Plus features keep working even if an online subscription lapses. See our refund policy.
Understand your body — and your privacy.
Plain-language guides to cycles, fertility and the questions worth asking about any period app.
Why a period tracker should work completely offline
What "local-first" really means, and why keeping cycle data on your phone changes everything.
Read guide →Is your period app selling your data? How to check
The permissions, policies and red flags that tell you where your reproductive data really goes.
Read guide →How period predictions actually work
Cycle averages, fertile windows and why an honest app shows you a range, not a fake exact date.
Read guide →Start tracking privately today.
No account, no ads, no catch. Install Private Period Tracker and your cycle data stays exactly where it belongs — with you.