# Mettagroup vs Rhythm LightScore

The clearest difference is in-app purchases: Rhythm LightScore at none against Mettagroup's 5. Rhythm LightScore also leads on update cadence (every 4 days vs every 2 months). Mettagroup's advantage is iOS requirement (15.1 vs 18.0). On price, ads and device support there is nothing between them.

Both are free to download. Mettagroup sells 5 in-app purchases, starting at $20.00 per month. Rhythm LightScore asks for nothing beyond the download.

Mettagroup ships an update every 2 months, Rhythm LightScore every 4 days. The most recent releases landed on October 28, 2026 and November 6, 2026 respectively.

## The numbers

| Metric | Mettagroup | Rhythm LightScore |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (5 ratings)](https://appshunter.io/ios/app/rhythm-lightscore/id6799837500/reviews)** |
| Number of ratings | — | **5** |
| Positive reviews | — | 100.0% of reviews |
| In-app purchases | Yes | **No** |
| Ads | No | No |
| Update frequency | Every 2 months | **Every 4 days** |
| Monetization | — | Free |
| Size | 41 MB | 26 MB |
| Requires iOS | **15.1** | 18.0 |
| Devices | iPhone, iPod | iPhone, Apple Watch |
| Age rating | 17+ | 4+ |
| Developer | [Mettagroup](https://appshunter.io/developer/6772154958) | [Rhythm Innovations, Inc.](https://appshunter.io/developer/6799837502) |

## What reviewers say

### Mettagroup

[App page](https://appshunter.io/ios/app/mettagroup/id6772154956)

**Features:** macOS Compatibility

**In-app purchases (5)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Kaleidoscope (discounted) | $20.00 | per month |
| Standard monthly | $30.00 | per month |
| Facilitator monthly | $50.00 | per month |
| Standard annual | $300.00 | per year |
| Facilitator annual | $500.00 | per year |


### Rhythm LightScore

[App page](https://appshunter.io/ios/app/rhythm-lightscore/id6799837500)

This app provides a daily "LightScore" based on your exposure to daylight, its consistency, and your pre-bedtime phone use. It offers insights into your light habits and suggests improvements for better well-being.

**Highlights:** Daily LightScore out of 100, Measures Light Time, Consistency, and Dark Time, Integrates with Apple Watch Health data, Uses phone camera as a light meter, Visualizes daily progress with Sol character, Sunset photo capture and sharing

**Features:** macOS Compatibility, Apple Watch app, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Mettagroup free?

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

### Is Rhythm LightScore free?

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

### Do Mettagroup or Rhythm LightScore have ads?

Neither Mettagroup nor Rhythm LightScore shows ads.

### Which is updated more often, Mettagroup or Rhythm LightScore?

Mettagroup ships an update every 2 months, and Rhythm LightScore every 4 days. Most recently, Mettagroup was updated on October 28, 2026 and Rhythm LightScore on November 6, 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.*