# Calm Rhythm vs Reaction Light Trainer

The clearest difference is in-app purchases: Calm Rhythm at none against Reaction Light Trainer's 2. Calm Rhythm also leads on ads (none vs shown). Reaction Light Trainer's advantage is update cadence (every 2 weeks vs every 3 weeks) and device support (4 vs 2). On price there is nothing between them.

Both are free to download. Reaction Light Trainer sells 2 in-app purchases, starting at $2.99 per year. Calm Rhythm asks for nothing beyond the download.

Calm Rhythm ships an update every 3 weeks, Reaction Light Trainer every 2 weeks. The most recent releases landed on October 25, 2026 and October 28, 2026 respectively.

## The numbers

| Metric | Calm Rhythm | Reaction Light Trainer |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 3 weeks | **Every 2 weeks** |
| Size | 5 MB | 46 MB |
| Requires iOS | 17.0 | **15.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod, Apple Watch** |
| Age rating | 4+ | 4+ |
| Developer | [剑炜 陈](https://appshunter.io/developer/1868267178) | [zhenyu song](https://appshunter.io/developer/1721282851) |

## What reviewers say

### Calm Rhythm

[App page](https://appshunter.io/ios/app/calm-rhythm/id6760476752)

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

**In-app purchases:** none


### Reaction Light Trainer

[App page](https://appshunter.io/ios/app/reaction-light-trainer-reflex/id6778074866)

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

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads (Yearly) | $2.99 | per year |
| Remove Ads | $6.99 | one-time |


## Frequently asked questions

### Is Calm Rhythm free?

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

### Is Reaction Light Trainer free?

Reaction Light Trainer is free to download, with in-app purchases available.

### Do Calm Rhythm or Reaction Light Trainer have ads?

Reaction Light Trainer shows ads; Calm Rhythm does not.

### Which is updated more often, Calm Rhythm or Reaction Light Trainer?

Calm Rhythm ships an update every 3 weeks, and Reaction Light Trainer every 2 weeks. Most recently, Calm Rhythm was updated on October 25, 2026 and Reaction Light Trainer on October 28, 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.*