Comparison

Euki vs 28X Private Period Tracker

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

Head to head
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.

About

28X Private Period Tracker

Understand your menstrual cycle with a privacy-focused period tracker. Log moods, symptoms, and gain insights into your body's patterns from first periods to menopause. All your data stays on your device, with no ads or data selling.

Highlights
  • Period and cycle tracking
  • Menstrual phase predictions
  • Mood, energy, and symptom logging
  • Clinically informed women's health content
  • Data stored locally on device
  • No ads, subscriptions, or data selling
Features
Read full description

28X Private Period™ is a free-to-use period tracker, privacy safe, designed to create a beautiful space to understand your cycle, from first periods to perimenopause and menopause. Your data stays yours. Always. No selling data. A women's health app built entirely around privacy. Free for everyone, everywhere. Discreet, clinically informed and very private. The first period tracker to achieve a 93% ORCHA rating. Periods are better on 28X. WHY WE’RE DIFFERENT Most period trackers rely on subscriptions, ads, or sharing user data to make money. 28X is the new way to track periods. - No subscriptions. Free for everyone, everywhere. - You have the power over your own data. It stays with you on your device. - No data selling, no data sharing. No cloud servers. - No ads. No subscriptions. No tracking. No paywalls. No locked features. - Calm, simple period tracking designed around privacy. Understand your body without giving up your data. - We build 28X alongside our users, listening to real feedback to shape what people actually want and need from the app. To help keep 28X free for everyone, you can contribute to an optional pay-it-forward feature that supports development and women and girls in vulnerable communities worldwide. No obligation. WHAT’S INSIDE THE APP Simple period tracking tools to help you understand your body. - Track Your Cycle - Period and cycle tracking - Clear menstrual phase predictions - Mood, energy, PMS and symptom logging - Patterns you can actually understand LEARN WOMEN'S HEALTH Supportive, clinically informed content designed to be clear, accessible, and empowering. Learn about: - Hormones and cycle phases - PMS and monthly changes - Endometriosis and PCOS - Perimenopause and menopause - Skin, mood, and energy shifts - Nutrition, lifestyle, contraception, and fertility PRIVACY FIRST - Your data stays with you - All data is stored on your device - No cloud storage - No tracking or profiling - No ads - No selling your data Health tracking built around you, not your data. FOR EVERYONE, EVERYWHERE 28X is free, global, and inclusive, designed for all backgrounds and life stages. Whether you are tracking your first period or navigating menopause, 28X helps you understand your body without giving up your privacy. 28X Private Period™ is not a medical device and doesn’t diagnose, monitor, prevent, treat or predict any health condition. It’s also not designed to help you get pregnant or avoid pregnancy. Always speak to a healthcare professional for personal medical advice.

Screenshots

Euki4 screens
28X Private Period Tracker4 screens

Verdict

The call

The clearest difference is rating: 28X Private Period Tracker at 5.0 against Euki's 4.2. 28X Private Period Tracker also leads on review sentiment (100% vs 70%) and update cadence (weekly vs every 3 weeks). Euki's advantage is in-app purchases (none vs 1) and ratings volume (162 vs 3). On price, ads, monetization model 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. 28X Private Period Tracker sells 1 one-off in-app purchase. Euki asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

28X Private Period Tracker holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: Euki has 162 ratings behind it against 3, so its average is the more settled of the two. Written reviews point the same way: 70% of Euki's written reviews are positive against 100% of 28X Private Period Tracker's.

UpkeepUpdate frequency

Euki ships an update every 3 weeks, 28X Private Period Tracker weekly. The most recent releases landed on October 26, 2026 and October 30, 2026 respectively.

Scorecard6 real differences · 4 level
Euki versus 28X Private Period Tracker: the parameters behind the verdict, then further details
ParameterEuki28X Private Period Tracker
PriceFreeFree
Rating4.2 (162 ratings)5.0 (3 ratings) — better
Positive reviews70.5% of reviews100.0% of reviews — better
Number of ratings162 — better3
Update frequencyEvery 3 weeksWeekly — better
AdsNoNo
In-app purchasesNo — betterYes
MonetizationFreeFree
DevicesiPhone, iPodiPhone, iPod
Requires iOS13.4 — better15.1
Further details — not scored
Size51 MB100 MB
Age rating12+4+
DeveloperEuki, Inc.28x

Customer experience

Euki

All ratings162 ratings
Positive77.2%
Neutral9.3%
Negative13.6%
Written reviews105 reviews
Positive70.5%
Neutral10.5%
Negative19.0%

28X Private Period Tracker

All ratings2 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

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

28X Private Period Tracker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

Euki

No in-app purchases

1 purchases

28X Private Period Tracker

One-time1
  • NEON Butterfly$1.99

Questions

Is Euki free?
Euki is free to download, with no in-app purchases.
Is 28X Private Period Tracker free?
28X Private Period Tracker is free to download, with in-app purchases available.
Which has better reviews, Euki or 28X Private Period Tracker?
28X Private Period Tracker is rated higher. Euki averages 4.2 out of 5 from 162 ratings, while 28X Private Period Tracker averages 5.0 from 3 ratings.
Do Euki or 28X Private Period Tracker have ads?
Neither Euki nor 28X Private Period Tracker shows ads.
Which is updated more often, Euki or 28X Private Period Tracker?
Euki ships an update every 3 weeks, and 28X Private Period Tracker weekly. Most recently, Euki was updated on October 26, 2026 and 28X Private Period Tracker on October 30, 2026.

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