# ZDRing vs Lullaby Method

The clearest difference is in-app purchases: ZDRing at none against Lullaby Method's 3. ZDRing also leads on device support (3 vs 1). Lullaby Method's advantage is update cadence (every 2 weeks vs every 5 weeks). On price, ads and iOS requirement there is nothing between them.

Both are free to download. Lullaby Method sells 3 in-app purchases, starting at $3.99 per 7 days. ZDRing asks for nothing beyond the download.

ZDRing ships an update every 5 weeks, Lullaby Method every 2 weeks. Both last shipped on October 2, 2026.

## The numbers

| Metric | ZDRing | Lullaby Method |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/zdring/id6745533781/reviews)** | — |
| Number of ratings | **1** | — |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 5 weeks | **Every 2 weeks** |
| Monetization | Free | — |
| Size | 292 MB | 75 MB |
| Requires iOS | **15.0** | 16.4 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Zhongdong Technology Co., Ltd.](https://appshunter.io/developer/1669208809) | [Engin Aytekin](https://appshunter.io/developer/1896277039) |

## What reviewers say

### ZDRing

[App page](https://appshunter.io/ios/app/zdring/id6745533781)

This app works with smart rings to monitor your sports performance in real time. It tracks steps, distance, calories burned, and sleep quality, integrating with Apple Health.

**Highlights:** Real-time sports performance monitoring, Step, distance, and calorie tracking, Sleep quality monitoring, Apple Health integration, Works with smart rings

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

**In-app purchases:** none


### Lullaby Method

[App page](https://appshunter.io/ios/app/lullaby-method/id6776793046)

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

**In-app purchases (3)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Lullaby Method Premium | $3.99 | per 7 days |
| Lullaby Method Premium | $9.99 | per month |
| Lullaby Method Premium | $59.99 | per year |


## Frequently asked questions

### Is ZDRing free?

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

### Is Lullaby Method free?

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

### Do ZDRing or Lullaby Method have ads?

Neither ZDRing nor Lullaby Method shows ads.

### Which is updated more often, ZDRing or Lullaby Method?

ZDRing ships an update every 5 weeks, and Lullaby Method every 2 weeks. Most recently, ZDRing was updated on October 2, 2026 and Lullaby Method on October 2, 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.*