Your cycle doesn’t belong in someone else’s cloud.
A calm, ad-free period and ovulation tracker that never asks for your email, never syncs to remote servers, and keeps every date, flow log, and daily note strictly on your phone.
Free on Apple App Store (iOS/iPadOS) & Google Play (Android) · Optional $9.99 lifetime unlock
If you wouldn’t announce your cycle across a coffee shop, why upload it to an ad network?
Most popular period trackers treat your reproductive calendar like a marketing funnel. They ask for your email before you log Day 1, store intimate cycle history on company servers, and lock basic forecasts behind $49.99–$79.99/year recurring subscriptions.
Period Diary takes the opposite path: open the app, tap your flow in two seconds, and close it. Rose marks your period days, soothing lavender marks your fertile window and ovulation estimate, and every byte stays right in your pocket.
Require account creation & email, store health history on remote servers, run behavioral ads, and upsell $50–$80/yr auto-renewing subscriptions.
Zero accounts, zero cloud sync, zero ads. Full everyday tracking stays free forever—plus an optional $9.99 one-time unlock for the Widget, 12-cycle Horizon, Face ID Lock, and PDF/CSV exports.
Calm, clear cycle clarity in two seconds a day
Real screenshots from Period Diary—designed in warm rose and calming lavender without clutter.
Gentle Cycle Wheel & Phase View
See today’s cycle day, current phase, and countdown to your next predicted period in one calm circle—with rose for bleeding days and lavender for fertile estimates.
Download free on iOS & Android →
Two-Tap Flow Log & Private Notes
Log period start and end dates, choose five flow levels (No Period, Light, Medium, Heavy, Very Heavy), and keep freeform daily notes—stored strictly offline.
See how local storage works →
Home Screen Widget & Face ID Lock
Check your cycle phase and mini month calendar right on your Home Screen in half a second—plus guard the app behind Face ID or a passcode.
Compare Free vs. One-Time Unlock →
Doctor-Ready PDF & CSV Exports
Generate a clean appointment summary or full backup over any date range—and toggle with one tap whether your private daily notes are included.
See the full feature tour →Free forever for daily tracking. One-time $9.99 if you want Pro tools.
No $59.99/year subscriptions, no hidden trials, and no ads on either tier.
Everything you need every month
- Gentle Cycle Wheel with current phase & period countdown
- Monthly calendar with predicted next period & fertile window
- Log period dates, 5 flow levels, and private daily notes
- All 3 customizable 9 AM local reminders (Period Start, Fertile Start, Fertile End)
- Zero accounts, zero email, zero ads, zero cloud
Advanced planning & extra privacy
- Home Screen Calendar Widget for instant at-a-glance phases
- Smart Predictions adapting to your average confirmed cycle length
- 3, 6, or 12-Cycle Horizon Forecast for travel & trip planning
- App Lock with Face ID or device passcode
- Doctor-Ready PDF & CSV Export (choose whether to include notes)
Privacy & cycle guides from Baby Newt
Why we built an offline tracker—and the other calm, ad-free apps in our family.
A Period Tracker That Doesn’t Need Your Email
How on-device SQLite storage eliminates data brokers, leaks, and intrusive account walls.
Inside Our Calmer Look & Home Screen Widget
A closer look at the Rose/Lavender palette overhaul, glanceable widget, and anti-subscription pledge.
Explore All Calm, Subscription-Free Apps
Meet Tummy Time for newborns and Lara’s Animal Flashcards for toddlers—built with zero ads.
Common questions
Honest answers about offline storage, what Period Diary logs, and what predictions can and cannot do.
Do I have to create an account or hand over my email address?
No. There is zero sign-up, zero email verification, and zero login screen. Open Period Diary and start logging right away.
What happens if I switch to a new phone without cloud sync?
Because your cycle entries never leave your phone or touch our servers, there is no remote cloud backup. Before switching phones, open Settings → Export Cycle Data to save a CSV or PDF copy of your history.
What is free vs. part of the optional $9.99 lifetime unlock?
Period & flow logging, daily notes, the Cycle Wheel, monthly calendar, 1-cycle-ahead predictions, and all 3 customizable cycle & fertility reminders are 100% free with zero ads. The optional $9.99 one-time unlock adds the Home Screen Calendar Widget, 3/6/12-cycle Horizon Forecast, Smart Predictions, Face ID / Passcode App Lock, and Doctor-Ready PDF & CSV exports.
Does Period Diary track symptoms, moods, or basal body temperature?
No—Period Diary is intentionally calm and minimal. It logs period start and end dates, five flow levels (No Period, Light, Medium, Heavy, Very Heavy), and freeform daily notes where you can record anything you want to remember.
Can I rely on predictions for birth control or avoiding pregnancy?
Please don’t. Predictions are mathematical calendar estimates based on the cycles you log, and real cycles vary. Never rely on any calendar prediction to plan or avoid pregnancy, and speak with your doctor about anything that worries you.
Is it available on both iPhone and Android?
Yes! Period Diary is free to download on both the Apple App Store (iPhone & iPad) and Google Play (Android), and the download buttons on this page route your device to the right store automatically.
Keep your cycle private today.
Download Period Diary free on iPhone, iPad, or Android. Zero accounts, zero ads, and your reproductive cycle data stays exclusively on your phone.
