# OOLER vs Hotmoon

The clearest difference is rating: OOLER at 4.8 against Hotmoon's 3.2. OOLER also leads on in-app purchases (none vs 2) and ratings volume (3.1K vs 41). On price, update cadence, ads and monetization model there is nothing between them.

Both are free to download. Hotmoon sells 2 in-app purchases, starting at $4.99 per month. OOLER asks for nothing beyond the download.

OOLER holds the better App Store score, 4.8 against 3.2. That said, the two scores are not equally well evidenced: OOLER has 3.1K ratings behind it against 41, 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 23% of Hotmoon's.

OOLER ships an update every 4 weeks, Hotmoon fortnightly. The most recent releases landed on October 17, 2026 and October 16, 2026 respectively.

## The numbers

| Metric | OOLER | Hotmoon |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (3.1K ratings)](https://appshunter.io/ios/app/ooler/id1381533477/reviews)** | [3.2 (41 ratings)](https://appshunter.io/ios/app/hotmoon/id1619035686/reviews) |
| Number of ratings | **3.1K** | 41 |
| Positive reviews | **40.5% of reviews** | 23.1% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 4 weeks | **Fortnightly** |
| Monetization | Free | Free |
| Size | 32 MB | 49 MB |
| Requires iOS | **14.0** | 15.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Sleepme Inc.](https://appshunter.io/developer/1381533476) | [Ustellar Technology Inc.](https://appshunter.io/developer/1451262106) |

## 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


### Hotmoon

[App page](https://appshunter.io/ios/app/hotmoon/id1619035686)

This app offers a personalized sleep solution by combining sound and light therapy with customizable sleep scenes. It provides a vast library of natural white noise, professional sound waves, and an intelligent mixing console to create unique soundscapes for better sleep.

**Highlights:** Sound Light Therapy Healing System, Sleep Scene Customization, 200+ natural white noise options, 300+ professional sound waves, Intelligent sound mixing console, Customizable soundscapes

**Features:** Vision Pro support

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Continuous Monthly VIP | $4.99 | per month |
| Continuous Year VIP | $49.99 | per year |


## Frequently asked questions

### Is OOLER free?

OOLER is free to download, with no in-app purchases.

### Is Hotmoon free?

Hotmoon is free to download, with in-app purchases available.

### Which has better reviews, OOLER or Hotmoon?

OOLER is rated higher. OOLER averages 4.8 out of 5 from 3.1K ratings, while Hotmoon averages 3.2 from 41 ratings.

### Do OOLER or Hotmoon have ads?

Neither OOLER nor Hotmoon shows ads.

### Which is updated more often, OOLER or Hotmoon?

OOLER ships an update every 4 weeks, and Hotmoon fortnightly. Most recently, OOLER was updated on October 17, 2026 and Hotmoon on October 16, 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.*