Comparison

Fertility Friend FF Tracker vs Euki

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

Head to head
About

Fertility Friend FF Tracker

This app helps women track their ovulation and fertile days with advanced charting tools. It provides personalized insights into your cycle, helping you understand your fertility signs and maximize your chances of conception. Millions of women trust it for accurate cycle analysis and pregnancy tracking.

Highlights
  • Ovulation detection
  • Fertile window prediction
  • BBT and cervical fluid tracking
  • Period and symptom logging
  • Interactive fertility charts
  • TTC educational library
  • Pregnancy monitoring
Read full description

Track ovulation with confidence with the gold standard fertility charting app, trusted for over 25 years. Fertility Friend helps to accurately find your most fertile days, understand your ovulation pattern, and learn more about your unique cycle. Join the millions of women who have used Fertility Friend while trying to conceive, including over 1 million who recorded positive pregnancy tests in the app. Track your period and key fertility signs (BBT, cervical fluid, OPKs, symptoms). Fertility Friend will automatically create your chart, highlight your fertile window, and provide personalized insights, including when ovulation likely occurred and when to test for pregnancy. Fertility Friend teaches you how to chart, what your signs mean, and gives you the confidence to never miss a fertile opportunity. What’s FREE: - We do not sell or share your data or display ads - 30-day trial of premium features (No credit card, no auto-charge) - Automatic ovulation detection - Use Fertility Friend’s advanced (default) accurate ovulation detector or choose ovulation detection based on the Fertility Awareness Method (FAM) - Interactive fertility chart with coverline and symptom display - Color-coded fertility calendar: see your period, fertile days, ovulation and more at a glance - Detailed and customizable data entry: period, BBT, OPK, CM, symptoms, meds, LH tests… - Sync with Apple Health and Oura (automatic import of temps, heart rate, sleep, and more) - Graphical cycle progress bar/ticker display - Daily data summary - Period tracking - Menstrual cycle statistics: cycle length, phase length, ovulation dates - Extensive TTC educational library: videos, lessons, quizzes, games, articles - Searchable gallery of 240,000+ shared cycles. - View real life BBT charts filtered by keywords - Sharing possibilities (optional) - Dark Mode and custom color themes - Companion access to FertilityFriend.com What’s PREMIUM (Highlights): - All Free features plus - Advanced fertility insights and analysis - More graphs & detailed interpretations - Enhanced data display on chart and calendar - Cycle comparison tools - Pregnancy Monitor - Pregnancy Tracker - Charts “Like Mine” gallery search - Stats display on Chart Gallery searches - Pattern detection - Private, supportive community - Additional expert tools developed over decades Fertility Friend offers unmatched experience, accuracy, and depth to help you understand your cycle with confidence. Important: This app provides educational estimates only and must not be used to avoid pregnancy or schedule medical procedures. Always consult your healthcare provider for medical advice.

About

Euki

This app offers comprehensive sexual health information and tracking tools with a strong emphasis on user privacy. It allows for customizable health tracking, period predictions, and access to a content library vetted by experts. Additionally, it features a care navigator to find reproductive health services.

Highlights
  • Customizable health tracking
  • Period and cycle predictions
  • Content library on sexual health
  • Care Navigator for health services
  • PIN protection for data
  • Anonymous data storage
Features
Read full description

Euki is the privacy first period tracker - plus so much more. Euki empowers you to take control of your health data and decisions with customizable health tools and learning resources- all with best in class privacy features. You can give feedback on the App via our anonymous, encrypted survey https://bit.ly/Euki-UX-Survey. And- if you love Euki - please help us by leaving a review in the App Store. Euki is a non-profit, open source project: co-designed by leading reproductive health researchers, privacy experts, and users like you! Learn more or donate to support our work via our website www.eukiapp.org. *Privacy. Period. No Data Collection Your data is stored locally (on your device) and nowhere else. Data Deletion You can delete data on the spot or schedule sweeps to remove sensitive information from your phone. No Third-Party Tracking When you use Euki, the only person collecting your data or tracking your activity is YOU. Anonymity You don’t need an account, email, or phone number to use Euki. PIN Protection You can set a customizable PIN passcode to protect your Euki data. *Track: Take control of your health Customizable Tracking Track everything from monthly bleeding to acne, headaches, and cramps. You can also set appointment and medication reminders. Period Predictions Know what to expect, when! The more you track, the more accurate the predictions will be. Cycle Summary Get a full picture of your cycle, from the average length of your cycle to the duration of each period, with Euki’s cycle summary. *Learn: Make Empowered Choices About Your Health Content Library Find non-judgmental information about abortion, contraception, sexually transmitted infections, and more—all vetted by health experts Personal Stories Discover real, relatable stories about other people’s sexual health experiences *Search: Find Care Options That Meet Your Needs and Preferences New Feature (Public Beta): Care Navigator Search, filter, and save up-to-date information on reproductive health care providers, from telehealth clinics to abortion support hotlines. Note: Although we have tested for privacy and security, this specific feature is in a ‘Public Beta’. This means we will be incorporating your feedback to improve its design and function. Give input via our encrypted, anonymous survey https://bit.ly/Euki-Care-Nav. Interactive Quizzes Take a quick quiz to decide which forms of contraception or other care might be best for you *Feature Details Abortion and Miscarriage Support Learn about different types of abortion and how to find a clinic you can trust Prepare for a clinic appointment, including what questions to ask a clinician and how to get financial support Set reminders to help you remember an appointment or when to take your pills Browse FAQs for answers and explore trusted resources for more information Read stories from real people who’ve had abortions or miscarriages Connect with organizations that provide free, confidential legal support Contraception Information Decide what matters most to you about contraception—like how often to take it or how to start or stop using it Access more detailed information about the contraception methods that might work for you Learn where and how to access your method of choice Comprehensive Sex Ed Explore easy-to-understand information on sex, gender, and sexuality Learn about consent and where you can turn for support Discover affirming resources that help answer other questions about LGBTQ issues, sex, gender, and health Euki Takes User Input Seriously Share feedback or requests through our anonymous, encrypted User Survey https://bit.ly/Euki-UX-Survey. Learn about or join our User Advisory Team. Reach out on social: IG @eukiapp, TikTok @euki.app Looking for other support? Email us: eukiapp@protonmail.com. Love Euki? Please help us by leaving a review in the App Store.

Screenshots

Fertility Friend FF Tracker4 screens
Euki4 screens

Verdict

The call

The clearest difference is rating: Fertility Friend FF Tracker at 4.8 against Euki's 4.1. Fertility Friend FF Tracker also leads on ratings volume (7.4K vs 116) and update cadence (weekly vs every 3 weeks). Euki's advantage is in-app purchases (none vs 4) and iOS requirement (13.4 vs 16.6). On price, review sentiment, ads and device support 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. Fertility Friend FF Tracker sells 4 one-off in-app purchases. Euki asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Fertility Friend FF Tracker holds the better App Store score, 4.8 against 4.1. That said, the two scores are not equally well evidenced: Fertility Friend FF Tracker has 7.4K ratings behind it against 116, so its average is the more settled of the two. Written reviews point the same way: 78% of Fertility Friend FF Tracker's written reviews are positive against 70% of Euki's.

UpkeepUpdate frequency

Fertility Friend FF Tracker ships an update weekly, Euki every 3 weeks. The most recent releases landed on September 22, 2026 and September 23, 2026 respectively.

Scorecard6 real differences · 4 level
Fertility Friend FF Tracker versus Euki: the parameters behind the verdict, then further details
ParameterFertility Friend FF TrackerEuki
PriceFreeFree
Rating4.8 (7.4K ratings) — better4.1 (116 ratings)
Positive reviews77.9% of reviews — better70.2% of reviews
Number of ratings7.4K — better116
Update frequencyWeekly — betterEvery 3 weeks
AdsNoNo
In-app purchasesYesNo — better
MonetizationFreemiumFree — better
DevicesiPhone, iPadiPhone, iPod
Requires iOS16.613.4 — better
Further details — not scored
Size33 MB51 MB
Age rating17+12+
DeveloperTamtris Web Services Inc.Euki, Inc.

Customer experience

Fertility Friend FF Tracker

All ratings7,402 ratings
Positive96.1%
Neutral1.6%
Negative2.3%
Written reviews349 reviews
Positive77.9%
Neutral6.6%
Negative15.5%

Euki

All ratings116 ratings
Positive76.7%
Neutral8.6%
Negative14.7%
Written reviews104 reviews
Positive70.2%
Neutral10.6%
Negative19.2%

User reviews

Fertility Friend FF Tracker

From 7.4K App Store ratings

What we love

  • 🚀 Accurate predictions
  • 💡 Comprehensive tracking features
  • 👍 Helpful educational resources
  • 🚀 Detailed data analysis
  • 🚀 Customizable symptom tracking

Room to improve

  • 🐛 Frequent app crashes
  • 💰 Expensive premium features
  • 🔒 Privacy concerns
  • 🕰️ Outdated user interface
  • 🐛 Inconsistent data syncing

Euki

From 116 App Store ratings

What we love

  • 🔒 Strong privacy protection and data security
  • 💰 Completely free with no paywalls or premium features
  • 📱 User-friendly and intuitive interface
  • 🎓 Comprehensive reproductive health education resources
  • 🔐 PIN protection with fake password decoy feature

Room to improve

  • 🐛 Frequent app crashes and glitches
  • ❌ No dark mode option
  • 📤 Cannot export or transfer data between devices
  • ⏰ Lacks notification/reminder features for upcoming periods
  • 🎨 Unappealing graphics and design aesthetic (subjective)

Bugs and requests

Fertility Friend FF Tracker

Reported bugs

4 issues
  • Unable to create account
  • Randomly deleting custom data
  • Inaccurate ovulation predictions
  • Pregnancy data not transferring

Requested features

5 requests
  • Offline mode with data syncing
  • Integration with Apple Health
  • More affordable subscription options
  • Improved community features
  • Streamlined data entry process

Euki

Reported bugs

13 issues
  • App crashes when accessing certain features
  • Calendar display missing days
  • Randomly added contraceptive shot entries to all logged days
  • App crashes when editing past bleeding logs
  • Cycle length recalculation not updating after new data
Show 8 more
  • Inability to uncheck accidentally selected items
  • Calendar resets to current date when editing past entries
  • Icons swapped in recent updates
  • Data disappearing without user action
  • PIN fake password feature (0000) not functioning
  • Finicky tap controls for calendar editing
  • App closes when attempting to correct logged data
  • Inaccurate cycle predictions despite consistent data

Requested features

22 requests
  • Dark mode support
  • Data export/import functionality
  • Period and ovulation notifications/reminders
  • Additional symptom tracking options (back pain, leg cramps, sleep changes, bowel changes, memory issues)
  • Basal body temperature tracking
Show 17 more
  • Menstrual pad type and absorbency tracking
  • Discharge type tracking
  • Cycle day numbers displayed on calendar
  • Ovulation and luteal phase indicators on calendar
  • Medication tracking (not just contraception)
  • Custom symptom categories
  • Longer notes section (1000+ characters)
  • Photo attachment capability for notes
  • Data download/export for doctor sharing
  • Follicular and luteal phase tracking
  • Multiple flow options per day
  • Birth control pill late/early tracking options
  • Perimenopause and menopause information
  • PIN recovery/reset mechanism
  • Appointment tracking separate from symptoms
  • Cycle summary display on app opening
  • Improved calendar interface for data entry

In-app purchases

4 purchases

Fertility Friend FF Tracker

One-time4
  • 30 Days VIP Membership$10.99
  • 90 Days VIP Membership$21.99
  • 1 Year VIP - Special Rate$23.99
Show 1 more
  • 1 Year VIP Membership$45.99
None

Euki

No in-app purchases

Questions

Is Fertility Friend FF Tracker free?
Fertility Friend FF Tracker is free to download, with in-app purchases available.
Is Euki free?
Euki is free to download, with no in-app purchases.
Which has better reviews, Fertility Friend FF Tracker or Euki?
Fertility Friend FF Tracker is rated higher. Fertility Friend FF Tracker averages 4.8 out of 5 from 7.4K ratings, while Euki averages 4.1 from 116 ratings.
Do Fertility Friend FF Tracker or Euki have ads?
Neither Fertility Friend FF Tracker nor Euki shows ads.
Which is updated more often, Fertility Friend FF Tracker or Euki?
Fertility Friend FF Tracker ships an update weekly, and Euki every 3 weeks. Most recently, Fertility Friend FF Tracker was updated on September 22, 2026 and Euki on September 23, 2026.

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