# Kmilight vs Rhythm Note

The clearest difference is price: Kmilight at Free against Rhythm Note's $3.99. Kmilight also leads on ratings volume (5 vs 1) and iOS requirement (12.0 vs 15.3). Rhythm Note's advantage is rating (5.0 vs 2.2). On update cadence, ads, in-app purchases and device support there is nothing between them.

Kmilight is free to download; Rhythm Note costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Rhythm Note holds the better App Store score, 5.0 against 2.2. That said, the two scores are not equally well evidenced: Kmilight has 5 ratings behind it against 1, so its average is the more settled of the two.

Kmilight ships an update monthly, Rhythm Note every 5 weeks. The most recent releases landed on September 21, 2026 and June 1, 2026 respectively.

## The numbers

| Metric | Kmilight | Rhythm Note |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | [2.2 (5 ratings)](https://appshunter.io/ios/app/kmilight/id1605691215/reviews) | **[5.0 (1 ratings)](https://appshunter.io/ios/app/rhythm-note/id6743887073/reviews)** |
| Number of ratings | **5** | 1 |
| Positive reviews | 40.0% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Monthly** | Every 5 weeks |
| Monetization | **Free** | Paid |
| Size | 72 MB | 32 MB |
| Requires iOS | **12.0** | 15.3 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 17+ | 4+ |
| Developer | [Jiangsu Konsung Bio-Medical Technology Co., Ltd.](https://appshunter.io/developer/1137866872) | [嘉成 梁](https://appshunter.io/developer/1803830905) |

## What reviewers say

### Kmilight

[App page](https://appshunter.io/ios/app/kmilight/id1605691215)

This app synchronizes and manages health data from connected pulse oximeters and wrist-worn devices, including blood oxygen saturation, heart rate, and sleep monitoring. It analyzes sleep data, generates trend charts, and can display data from connected ventilators, though this data is for informational purposes only.

**Highlights:** Blood oxygen saturation monitoring, Heart rate tracking, Sleep monitoring and analysis, Health data trend charting, Ventilator data display, Data management and storage

**Features:** macOS Compatibility

**In-app purchases:** none


### Rhythm Note

[App page](https://appshunter.io/ios/app/rhythm-note/id6743887073)

Track and analyze your physical, emotional, and intellectual cycles to make informed decisions. Offers personalized advice and data visualization based on scientific biorhythm theory. Supports multiple users and prioritizes local data storage for privacy.

**Highlights:** Calculate biorhythm indices, Visualize cycle trends, Personalized activity suggestions, Multi-user support, Local data storage, Trend prediction curves

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is Kmilight free?

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

### Is Rhythm Note free?

Rhythm Note costs $3.99, with no in-app purchases.

### Which has better reviews, Kmilight or Rhythm Note?

Rhythm Note is rated higher. Kmilight averages 2.2 out of 5 from 5 ratings, while Rhythm Note averages 5.0 from 1 ratings.

### Do Kmilight or Rhythm Note have ads?

Neither Kmilight nor Rhythm Note shows ads.

### Which is updated more often, Kmilight or Rhythm Note?

Kmilight ships an update monthly, and Rhythm Note every 5 weeks. Most recently, Kmilight was updated on September 21, 2026 and Rhythm Note on June 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.*