Comparison

Period Tracker vs LunaCat

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Period Tracker

This app helps you track your menstrual cycle, predict ovulation, and log symptoms. It offers personalized insights and gentle reminders to help you understand your body better. Designed for simplicity and privacy, it's a comprehensive tool for managing your reproductive health.

Highlights
  • Menstrual cycle tracking
  • Ovulation prediction
  • Period and flow logging
  • Symptom and emotion tracking
  • Personalized insights
  • Gentle reminders
Read full description

Meet Ruby – your simple, smart, and free period tracker. Whether you want to track your menstrual cycle, get accurate ovulation predictions, or simply have a clue about your period, Ruby makes it easy to understand your body. Think of it as having Aunt Flo, Aunt Ruby, and your own personal cycle tracker all in one app. With Ruby, you can: - Log your period, flow, and symptoms with just a tap - Use our ovulation tracker to know your most fertile days - Predict cycles with a free period tracker that adapts to you - Track emotions, energy, stress, and notes in one place - Get gentle reminders for upcoming periods, ovulation, and fertile windows Why choose Ruby? - Simple & private – Easy to use, built with privacy in mind. - Your cycle, your way – From teens starting their first period, to women tracking fertility, pregnancy, or perimenopause. - More than a calendar – Ruby helps you spot patterns, manage PMS, and make your cycle feel less of a mystery. How Ruby Stands Out - Have a lively cycle every month with personalized insights. - Finally, an app that helps you truly have a clue about your period. - Forget “my cycle” being hard to remember—Ruby keeps it all logged for you. It's just a clean free period app experience. Privacy policy: https://bit.ly/rafiki-privacy-policy Terms of use: https://bit.ly/rafiki-terms-of-service

About

LunaCat

Features
Read full description

From your period to ovulation and trying to conceive — your body's rhythm, at a glance Your body shifts a little every month. Track it with LunaCat. LunaCat is a free period tracker that logs your cycle, ovulation and fertile window, and helps with trying to conceive and looking after your health. Log just your period start date and it works out your next period, your predicted ovulation and your fertile window. You can log the day-to-day too — symptoms, mood, discharge, birth control pills. No account needed. Start light, with a calendar that's just yours. ■ Logging a period is one tap When your period starts, press the button. The start date alone is enough to work out your next cycle. · One-tap period start · Next period worked out for you · See your cycle and period length · Edit past periods · Month and year calendar views ■ Period, ovulation and fertile days on one calendar Days you bled, your next expected period, predicted ovulation and your fertile window are each marked clearly. Tap a date and that day's logs open right up. ■ Ovulation and your fertile window Log a positive ovulation test and this cycle's prediction adjusts to it. Not using test strips? You can mark your ovulation day yourself. · See your predicted ovulation · See your fertile window · Log positive ovulation tests · Mark ovulation yourself · Cycle view built for conceiving ■ Trying to conceive, pregnant, breastfeeding or on birth control Your home screen follows whatever matters to you right now. Trying to conceive? It leads with ovulation and your fertile window. Just tracking your cycle? It leads with your next period. You can also say you're pregnant, breastfeeding or on contraception. ■ Log how your body feels Dates alone tell you less than dates plus how you actually felt. · Period symptoms and PMS · Mood changes · Vaginal discharge · Digestion and activity · Sex · Contraception · Birth control pills Look back at how you felt at this point in earlier cycles, too. Log your mood and Luna the cat's expression changes with it. Pick who keeps you company — Luna the black cat, or Pinkduck. ■ Your cycle, analysed Once a few cycles are logged, your own pattern gets easier to read. · Average cycle length · Average period length · Cycle changes month by month · How regular your cycle is · Symptom heatmap See which symptoms and moods tend to show up at which point in your cycle. ■ Only the reminders you want, when you want them · Next period reminder · Ovulation and fertile window reminder · Birth control pill reminder · Daily log reminder ■ A home screen widget See how many days until your next period without opening the app. Because it's personal, the details are hidden by default — turn them on whenever you like. ■ Share only what you want with your partner Turn your fertile window and predicted ovulation into a card and send it to your partner. Choose exactly what goes on it — ovulation date, fertile window, your moods and symptoms. The card is built on your own device. ■ Reads that make sense of your body · The menstrual cycle in four phases · Premenstrual changes (PMS) · Choosing period products · Birth control methods · Vaginal health · Signs worth seeing a doctor about ■ Your logs, for your eyes Period, pregnancy and sex logs are sensitive, so privacy got real attention. · App lock with Face ID or your fingerprint · Screenshot and screen-recording blocking · Hidden notification content on your lock screen LunaCat is not a medical device, and period, ovulation and fertile window predictions are for guidance only. Fertile window predictions must not be used as a method of contraception. Talk to a healthcare professional about any medical decision relating to your health or a pregnancy.

Screenshots

Period Tracker4 screens
LunaCat4 screens

Verdict

The call

The clearest difference is in-app purchases: LunaCat at none against Period Tracker's 1. LunaCat also leads on ads (none vs shown) and update cadence (every 5 days vs every 2 weeks). On price, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Period Tracker sells 1 in-app purchase, starting at $29.99 per year. LunaCat asks for nothing beyond the download.

UpkeepUpdate frequency

Period Tracker ships an update every 2 weeks, LunaCat every 5 days. The most recent releases landed on October 29, 2026 and October 24, 2026 respectively.

Scorecard3 real differences · 7 level
Period Tracker versus LunaCat: the parameters behind the verdict, then further details
ParameterPeriod TrackerLunaCat
PriceFreeFree
Rating5.0 (4 ratings) — better—
Positive reviews100.0% of reviews—
Number of ratings4 — better—
Update frequencyEvery 2 weeksEvery 5 days — better
AdsYesNo — better
In-app purchasesYesNo — better
MonetizationFree—
DevicesiPhone, iPad — betteriPhone
Requires iOS17.016.4 — better
Further details — not scored
Size47 MB60 MB
Age rating12+4+
DeveloperRafiki AppsJINTAE IM

In-app purchases

1 purchases

Period Tracker

Subscriptions1
  • Ruby Premium7 Days trial$29.991 Year
None

LunaCat

No in-app purchases

Questions

Is Period Tracker free?
Period Tracker is free to download, with in-app purchases available.
Is LunaCat free?
LunaCat is free to download, with no in-app purchases.
Do Period Tracker or LunaCat have ads?
Period Tracker shows ads; LunaCat does not.
Which is updated more often, Period Tracker or LunaCat?
Period Tracker ships an update every 2 weeks, and LunaCat every 5 days. Most recently, Period Tracker was updated on October 29, 2026 and LunaCat on October 24, 2026.

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