Iris vs Cycle Diary

Every feature free. No subscription. No data sharing. Ever. Many period apps charge $10 to $15 a month, and some have been caught sharing reproductive health data with advertisers. Iris keeps your cycle data on your iPhone: no Iris servers, no account, no analytics. Your health data is never shared or sold. PERIOD & CYCLE TRACKING Log your period and Iris predicts your next one, your fertile window, ovulation day and PMS phase, mapped out weeks in advance. Color-coded calendar, day log and smart reminders included. HOME & LOCK SCREEN WIDGETS See your cycle day, phase and days until your next period at a glance, right on your Home Screen or Lock Screen. IRREGULAR CYCLE TRACKING Iris detects cycle variability from your data and switches to honest prediction ranges instead of single dates. No fertile window guessing for irregular cycles. Built for PCOS, perimenopause and anyone whose body doesn't fit the textbook. PERSONAL INSIGHTS & PATTERN DETECTION Iris turns your daily logs into useful patterns. See which symptoms, moods, discharge types, activity and vitals appear most often in each cycle phase, then tap into any pattern for phase distribution, cycle-day timing, recent history and prediction notes. After enough history, Iris can help you spot recurring signals like fatigue, cramps, mood shifts or discharge changes before they appear, with insights calculated privately on your device. LH STRIP LOGGING Log your daily ovulation test result: Negative, Positive or Peak. Iris immediately shifts your ovulation estimate to reflect your actual LH surge. Over time, Iris learns your personal luteal phase length and uses it to sharpen every future prediction, replacing the generic 14-day default with your actual biology. BBT TRACKING Log your basal body temperature each morning and Iris calculates your personal coverline. When three consecutive readings rise above it, Iris marks a confirmed thermal shift: retrospective confirmation that ovulation occurred. Pair BBT with LH strips for the symptothermal method, completely free. APPLE HEALTH SYNC Two-way sync with Apple Health. Iris reads your period history, BBT from connected thermometers, sleep and weight. Period days, BBT, LH results and cervical mucus are written back to your Health dashboard. What you log in Iris always wins; Apple Health only fills days you haven't logged. CONTRACEPTIVE & POSTPARTUM MODE On the pill, a hormonal IUD or a copper IUD? Contraceptive Mode pauses ovulation predictions, labels bleeds as withdrawal bleeds and adds a daily pill reminder. Just had a baby? Postpartum Mode pauses predictions while you recover, then resumes when you're ready. SYMPTOM & MOOD TRACKING Log mood, 14 symptoms (cramps, bloating, fatigue, acne, brain fog, hair shedding and more), discharge type with fertility context, sleep, weight and notes for any day. HORMONE EDUCATION Visualize estrogen, progesterone, FSH and LH across your full cycle, mapped to your own cycle length so the chart reflects your actual rhythm. PARTNER SHARING Invite a partner to follow your cycle: view-only, end-to-end encrypted and completely free. PRIVATE BY DESIGN Your data stays on your iPhone. No Iris servers. Optional iCloud backup goes to your own iCloud account, and we never see it. No analytics or tracking SDKs. The free version shows ads, which never receive your health data; a one-time purchase removes them. 100% FREE, NO EXCEPTIONS No premium tier. No subscriptions. No paywalls. Every single feature, from LH logging and BBT charting to irregular cycle detection, Apple Health sync, widgets, contraceptive mode and postpartum mode, is free for everyone, forever. Download Iris. Your cycle is yours.

Cycle Diary is a private period tracker and menstrual calendar that lives on your phone. Log your period, follow your cycle, and see the pattern your body has been keeping all along. There is no account to create, no ads, no subscription and nothing behind a paywall. Every feature is free, in 65 languages. TRACK YOUR PERIOD Tap the days your period starts and ends and the calendar fills in around them. Cycle Diary works out your average cycle length and period length from what you actually enter, then shows the next expected period right on the home screen. Cycles that are not clockwork are perfectly normal, so if yours vary you can switch on irregular mode and see an honest date range instead of a single confident day. KNOW YOUR FERTILE WINDOW Turn on fertility predictions and the calendar marks your fertile window and your estimated ovulation day, with higher and lower chance days shaded so you can read a whole month at a glance. These are estimates based on the dates you enter. They are not medical advice and not a method of birth control. LOG MORE THAN DATES A period is not only a date range. For any day you can record flow intensity from spotting to heavy, your mood, symptoms such as cramps, headache, bloating, back pain, breast tenderness, nausea, dizziness, acne, appetite changes, fatigue and insomnia, whether you were sexually active and whether protection was used, and a note in your own words. SEE YOUR OWN PATTERN The history screen lays out every recorded cycle beside the length of the period inside it, so you can tell at a glance whether things are steady or drifting. Averages update as you log. You choose whether predictions are calculated from your recent months or from lengths you set by hand. GENTLE REMINDERS Optional notifications tell you when your period is due, when a heavier day is expected, when your fertile window opens and when your cycle is running late. You pick how many days ahead and at what time of day, and you can switch the lot off. PREGNANCY MODE Expecting? Record the start and expected end of a pregnancy and Cycle Diary pauses predictions and reminders for that stretch rather than guessing at a cycle you are not having. Your history is kept and picks up again afterwards. BUILT TO STAY PRIVATE Your entries live on your device. There is no account, we run no servers of our own, and there is nothing to sign up for. If you are signed in to iCloud your entries also sync to your own private iCloud storage, encrypted, so a new phone or a reinstall brings them straight back. We never see them. No analytics, no advertising, no tracking of any kind. LOCK IT Set a PIN, or unlock with Face ID or Touch ID. You can also hide the app's contents in the app switcher, so a glance over your shoulder shows a blank screen. YOURS TO TAKE WITH YOU Export everything to a CSV file whenever you like, and import a CSV back in. Your data is never held hostage. WHO IT IS FOR Whether you are keeping an eye on your monthly cycle, trying to conceive, watching PMS build in the days before bleeding, following an irregular or unusually long cycle, coming off hormonal birth control, or you simply want a quiet private diary of how each month felt, Cycle Diary stays out of your way. It works offline and opens straight to the calendar. NO ACCOUNT, NO ADS, NO SUBSCRIPTION Nothing is locked. No premium tier, no trial that ends, no upsell, no advertising. The whole app is free and always will be. IN 65 LANGUAGES English, Spanish, Chinese, Hindi, Arabic, French, Bengali, Portuguese, Russian, Indonesian, Urdu, German, Japanese, Vietnamese, Turkish, Korean, Thai, Italian, Dutch, Greek, Polish, Malay, Malayalam, Swedish, Hungarian, Czech, Hebrew, Catalan, Croatian, Danish, Finnish, Slovak, Norwegian, Slovenian and more. Cycle Diary is a tracking and information app. It is not a medical device and gives no medical advice, diagnosis or treatment. For health decisions, speak to a qualified healthcare professional.