Comparison

OOLER vs Flyer Period Tracker

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

Head to head
About

OOLER

This app controls a smart sleep system that regulates your sleeping surface temperature for optimal rest. It allows for personalized schedules, temperature adjustments, and features like a gentle warming alarm to improve your sleep and wake routines.

Highlights
  • Adjustable mattress temperature (55-110°F)
  • Personalized sleep schedules
  • Temperature variations for sleep
  • Warm Awake alarm feature
  • Adjustable fan speed modes
Read full description

The OOLER app is designed to work seamlessly with the OOLER Control Unit. OOLER, made by Sleepme Inc. and the minds behind the chiliPAD, is the most advanced of its kind to address the frequently overlooked but crucial sleep factor: temperature. OOLER is our most luxurious sleep system, which adjusts your sleeping surface temperature from 55-110°F (13-43°C). Control Your Sleep Temperature - Increase or decrease your mattress temperature to your desired level - Select your sleep temperature from 55°-110°F (13°-43°C) Set Personalized Sleep Schedules - Enjoy temperature perfection all night long - Set multiple sleep temperatures for the night or week ahead - Set temperature variations to fall asleep warm and stay asleep cold or anywhere in-between Improve your Evening & Morning Routine - Set bedtime reminders to improve your bedtime consistency - Use the Warm Awake feature as alarm clock replacement. Enjoy waking up with a gentle warming of the mattress temperature to trigger your body’s natural wake response & More - Set your desired noise level with Silent, Regular and Boost fan speed modes Finally, sleep as nature intended with OOLER. Learn more and get yours at chilisleep.com.

About

Flyer Period Tracker

Track your menstrual cycles, predict fertile and ovulation days, and monitor your health with personalized insights. Get professional tips and analyze your symptoms for better well-being. Includes heart rate monitoring and health tests.

Highlights
  • Period and ovulation prediction
  • Fertility planning
  • Heart rate monitoring
  • Health tests and analysis
  • Daily health tips
  • Symptom and mood tracking
  • Cycle trend monitoring
Features
Read full description

Flyer Period Tracker, your intimate health assistant. The APP is base on scientific research to manage your cycles. Our team has cooperated with gynecologists and natural fertility specialists in the United States to provide professional tips for your health. We promise to protect your personal data and never use them without your permission. * We do not sell your data. * We have never sold your data. * We will never sell your data. PERIOD PREDICTION *Track your cycle and accurately predict your next period, fertile and ovulation day. *Observe your period condition, When your period is abnormal, such as delayed or prolonged menstrual period, we will promptly remind you. GET PREGNANT *You can get non-fertile or fertile predictions on the homepage. Help you to plan for pregnancy better. *BBT curve can help you track your ovulation signal, there will be your recorded sexual behavior, cervical information, ovulation test and pregnancy test and other information. BABY PREDICTION * Do you want a boy or a girl in the future? Does the baby look like Dad or Mom? Come and test what you and your lover's baby will be like? HEART RATE * Quickly measure your pulse by one tap. You can know more about your body. HEALTH TESTS * Including baby prediction, menstrual health, dysmenorrhea and other tests, easily obtain your health status. DAILY TIPS & HEALTH CONTENT *Professional tips are provided daily to care for your health. You also can get some tips to relieve cramps and headaches, etc. Help you have a better condition and more energy every day. *Women’s health content, including cycle and pregnancy topics, to help you manage your fertility. CYCLES, PMS SYMPTOMS ANALYSIS *Get health index according to your period condition. *Show your personalized graphs about your cycle length and symptoms. *Monitor your health trends, know your health status at any time. SYMPTOM PREDICTION *Intelligently predict the occurrence of the symptom for you. You can learn when common PMS symptoms may occur, such as headache, cramps, breast tenderness, back pain and insomnia, etc. *Recording your mood and symptoms every day can help us better analyze your health. Flyer Period Tracker uses HealthKit to synchronize data and supports reading menstrual data, sexual activity, basal bosy temperature, etc. SUBSCRIPTION INFORMATION - Premium features : Unlock All Access, No ads - Payment: Payment will be charged to your Apple account on confirmation of purchase - Cancellation: Manage at your Apple Account Settings - Renewal: Account will be charged for renewal 24-hours before the end of the current period --------- WHAT OUR USERS SAY: "I like this app, this app is very useful." "Thank you, I concieved successfully with the help of this app." Welcome to join us! --------- If you run into any trouble, please contact us through email at fpperiodtracker@gmail.com. If you enjoy the app, feel free to leave us a 5-star rating and review! We will continue to improve our products and provide you with a high-quality product experience! Privacy Policy: http://resource.guansuqx.com/FP_Period_Tracker/privacy.html Terms of Use: http://resource.guansuqx.com/FP_Period_Tracker/service.html

Screenshots

OOLER4 screens
Flyer Period Tracker4 screens

Verdict

The call

The clearest difference is rating: OOLER at 4.8 against Flyer Period Tracker's 4.0. OOLER also leads on in-app purchases (none vs 3) and ads (none vs shown). Flyer Period Tracker's advantage is iOS requirement (12.0 vs 14.0). On price, review sentiment, update cadence 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. Flyer Period Tracker sells 3 in-app purchases, starting at $5.99 per 7 days. OOLER asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

OOLER holds the better App Store score, 4.8 against 4.0. That said, the two scores are not equally well evidenced: OOLER has 3.2K ratings behind it against 22, so its average is the more settled of the two. Written reviews point the same way: 40% of OOLER's written reviews are positive against 33% of Flyer Period Tracker's.

UpkeepUpdate frequency

OOLER ships an update every 4 weeks, Flyer Period Tracker fortnightly. The most recent releases landed on November 2, 2026 and November 3, 2026 respectively.

Scorecard6 real differences · 4 level
OOLER versus Flyer Period Tracker: the parameters behind the verdict, then further details
ParameterOOLERFlyer Period Tracker
PriceFreeFree
Rating4.8 (3.2K ratings) — better4.0 (22 ratings)
Positive reviews40.5% of reviews — better33.3% of reviews
Number of ratings3.2K — better22
Update frequencyEvery 4 weeksFortnightly — better
AdsNo — betterYes
In-app purchasesNo — betterYes
MonetizationFree — betterFree with in-app purchases
DevicesiPhone, iPodiPhone, iPod
Requires iOS14.012.0 — better
Further details — not scored
Size32 MB201 MB
Age rating4+12+
DeveloperSleepme Inc.Ofly Tech Co., Ltd.

Customer experience

OOLER

All ratings3,126 ratings
Positive94.5%
Neutral2.2%
Negative3.4%
Written reviews121 reviews
Positive40.5%
Neutral12.4%
Negative47.1%

Flyer Period Tracker

All ratings22 ratings
Positive72.7%
Neutral9.1%
Negative18.2%
Written reviews3 reviews
Positive33.3%
Neutral0.0%
Negative66.7%

Bugs and requests

OOLER

Reported bugs

5 issues
  • App randomly resets temperature settings
  • Schedules not working as expected
  • Bluetooth connectivity issues
  • App logging users out unexpectedly
  • Water level monitoring not functioning properly

Requested features

5 requests
  • Add Celsius temperature display option
  • Implement variable/customizable sleep schedules
  • Integrate with smart home platforms (Alexa, HomeKit, etc.)
  • Add automatic shut-off timer feature
  • Improve app UI and user experience

Flyer Period Tracker

Not enough reviews yet to summarise bugs or requests.

In-app purchases

None

OOLER

No in-app purchases

3 purchases

Flyer Period Tracker

Subscriptions3
  • Flyer Premium3 Days trial$5.997 Days
  • Flyer Premium$19.991 Month
  • Flyer Premium3 Days trial$19.991 Month

Questions

Is OOLER free?
OOLER is free to download, with no in-app purchases.
Is Flyer Period Tracker free?
Flyer Period Tracker is free to download, with in-app purchases available.
Which has better reviews, OOLER or Flyer Period Tracker?
OOLER is rated higher. OOLER averages 4.8 out of 5 from 3.2K ratings, while Flyer Period Tracker averages 4.0 from 22 ratings.
Do OOLER or Flyer Period Tracker have ads?
Flyer Period Tracker shows ads; OOLER does not.
Which is updated more often, OOLER or Flyer Period Tracker?
OOLER ships an update every 4 weeks, and Flyer Period Tracker fortnightly. Most recently, OOLER was updated on November 2, 2026 and Flyer Period Tracker on November 3, 2026.

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