# LuckRing vs osaring sizer

The clearest difference is in-app purchases: osaring sizer at none against LuckRing's 5. osaring sizer also leads on update cadence (every 4 days vs every 3 weeks). On price, ads, device support and iOS requirement there is nothing between them.

Both are free to download. LuckRing sells 5 one-off in-app purchases. osaring sizer asks for nothing beyond the download.

LuckRing ships an update every 3 weeks, osaring sizer every 4 days. The most recent releases landed on October 11, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | LuckRing | osaring sizer |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (331 ratings)](https://appshunter.io/ios/app/luckring/id6472891975/reviews)** | — |
| Number of ratings | **331** | — |
| Positive reviews | 22.7% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Every 4 days** |
| Monetization | Free with in-app purchases | — |
| Size | 130 MB | 58 MB |
| Requires iOS | 15.0 | 15 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Coolwear Technology Co., LTD](https://appshunter.io/developer/1530652906) | [Shenzhen Huoyan Intelligence Co.,Ltd](https://appshunter.io/developer/1895154951) |

## What reviewers say

### LuckRing

[App page](https://appshunter.io/ios/app/luckring/id6472891975)

This smart wearable device combines technology and fashion to offer users convenient functions and personalized experiences. It is important to note that this is not a professional medical device, and its data is for reference only.

**Highlights:** Smart wearable device, Combines technology and fashion, Convenient functions, Personalized experiences, Reference health data

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 次卡 | $0.99 | one-time |
| Vip 月卡 | $1.99 | one-time |
| 季卡 | $2.99 | one-time |
| Vip 年卡 | $3.99 | one-time |
| 永久卡 | $6.99 | one-time |

**What reviewers like**

- 🚀 Accurate health metrics
- 🔒 Reliable Bluetooth connection
- 👍 Comfortable and stylish design
- 💡 Gesture controls for media
- 👍 Comprehensive health tracking

**What reviewers complain about**

- 🐛 Inconsistent sleep tracking
- 🐛 Glitchy app updates
- 👎 Limited workout options
- 👎 Confusing sleep stage terminology
- 🔋 Shorter battery life after updates

**Reported bugs**

- App login/registration issues
- Disconnection problems
- Data loss after app updates
- Inaccurate step/activity tracking

**Requested features**

- Option to change temperature unit
- Weekly/monthly health data reporting
- Automatic nap detection
- Ability to sync with Apple Health


### osaring sizer

[App page](https://appshunter.io/ios/app/osaring-sizer/id6766071045)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is LuckRing free?

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

### Is osaring sizer free?

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

### Do LuckRing or osaring sizer have ads?

Neither LuckRing nor osaring sizer shows ads.

### Which is updated more often, LuckRing or osaring sizer?

LuckRing ships an update every 3 weeks, and osaring sizer every 4 days. Most recently, LuckRing was updated on October 11, 2026 and osaring sizer on October 1, 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.*