# OOLER vs Flyer Period Tracker

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.

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.

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.

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.

## The numbers

| Metric | OOLER | Flyer Period Tracker |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.2K ratings)](https://appshunter.io/ios/app/ooler/id1381533477/reviews)** | [4.0 (22 ratings)](https://appshunter.io/ios/app/flyer-period-tracker/id1556205664/reviews) |
| Number of ratings | **3.2K** | 22 |
| Positive reviews | **40.5% of reviews** | 33.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Monetization | **Free** | Free with in-app purchases |
| Size | 32 MB | 201 MB |
| Requires iOS | 14.0 | **12.0** |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 12+ |
| Developer | [Sleepme Inc.](https://appshunter.io/developer/1381533476) | [Ofly Tech Co., Ltd.](https://appshunter.io/developer/1556021627) |

## What reviewers say

### OOLER

[App page](https://appshunter.io/ios/app/ooler/id1381533477)

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

**In-app purchases:** none

**What reviewers like**

- 💤 Improved sleep quality
- ❄️ Effective cooling/heating
- 🌙 Warm wake-up feature
- 🌟 Life-changing product
- 🛌 Comfortable sleeping experience

**What reviewers complain about**

- 🐛 Buggy app with connectivity issues
- 🕰️ Unreliable scheduling/timer features
- 🚫 Requires account/login to use
- 💧 Lack of low water level notifications
- 📱 App needs more advanced functionality

**Reported bugs**

- 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**

- 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

[App page](https://appshunter.io/ios/app/flyer-period-tracker/id1556205664)

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:** macOS Compatibility, Vision Pro support

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Flyer Premium | $5.99 | per 7 days |
| Flyer Premium | $19.99 | per month |
| Flyer Premium | $19.99 | per month |


## Frequently asked 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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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*