# 認知シャッフル睡眠法 vs EyeCare Tracker

The clearest difference is iOS requirement: 認知シャッフル睡眠法 at 15.1 against EyeCare Tracker's 17.0. On price, update cadence, ads and in-app purchases there is nothing between them.

Both are free to download. 認知シャッフル睡眠法 sells 2 in-app purchases, starting at $1.99 per month and EyeCare Tracker sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.

認知シャッフル睡眠法 ships an update every 6 weeks, EyeCare Tracker every 2 months. The most recent releases landed on October 11, 2026 and October 19, 2026 respectively.

## The numbers

| Metric | 認知シャッフル睡眠法 | EyeCare Tracker |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | Yes | Yes |
| Ads | No | No |
| Update frequency | **Every 6 weeks** | Every 2 months |
| Size | 136 MB | 3 MB |
| Requires iOS | **15.1** | 17.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [mika kubo](https://appshunter.io/developer/1877061175) | [torankirite](https://appshunter.io/developer/1883564850) |

## What reviewers say

### 認知シャッフル睡眠法

[App page](https://appshunter.io/ios/app/sleepwords/id6759151074)

**Features:** macOS Compatibility

**In-app purchases (2)**

| Purchase | Price | Billing |
| --- | --- | --- |
| SleepWords Premium (Monthly) | $1.99 | per month |
| SleepWords Premium (Yearly) | $19.99 | per year |


### EyeCare Tracker

[App page](https://appshunter.io/ios/app/eyecare-tracker/id6760272190)

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Ads | $3.99 | one-time |


## Frequently asked questions

### Is 認知シャッフル睡眠法 free?

認知シャッフル睡眠法 is free to download, with in-app purchases available.

### Is EyeCare Tracker free?

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

### Do 認知シャッフル睡眠法 or EyeCare Tracker have ads?

Neither 認知シャッフル睡眠法 nor EyeCare Tracker shows ads.

### Which is updated more often, 認知シャッフル睡眠法 or EyeCare Tracker?

認知シャッフル睡眠法 ships an update every 6 weeks, and EyeCare Tracker every 2 months. Most recently, 認知シャッフル睡眠法 was updated on October 11, 2026 and EyeCare Tracker on October 19, 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.*