# Echo Eye vs GLK Sleep

The clearest difference is update cadence: Echo Eye at every 3 weeks against GLK Sleep's every 3 months. Echo Eye also leads on device support (3 vs 1) and iOS requirement (14.0 vs 16.0). On price, ads and in-app purchases there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

Echo Eye ships an update every 3 weeks, GLK Sleep every 3 months. The most recent releases landed on September 10, 2026 and September 29, 2026 respectively.

## The numbers

| Metric | Echo Eye | GLK Sleep |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 3 months |
| Size | 75 MB | 3 MB |
| Requires iOS | **14.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone |
| Age rating | 4+ | 4+ |
| Developer | [HSC Tech Limited](https://appshunter.io/developer/1810433761) | [GLK TECHNOLOGY CO. LIMITED](https://appshunter.io/developer/1707135075) |

## What reviewers say

### Echo Eye

[App page](https://appshunter.io/ios/app/echo-eye/id6745018632)

**Features:** macOS Compatibility

**In-app purchases:** none


### GLK Sleep

[App page](https://appshunter.io/ios/app/glk-sleep/id6759814946)

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

**In-app purchases:** none


## Frequently asked questions

### Is Echo Eye free?

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

### Is GLK Sleep free?

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

### Do Echo Eye or GLK Sleep have ads?

Neither Echo Eye nor GLK Sleep shows ads.

### Which is updated more often, Echo Eye or GLK Sleep?

Echo Eye ships an update every 3 weeks, and GLK Sleep every 3 months. Most recently, Echo Eye was updated on September 10, 2026 and GLK Sleep on September 29, 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.*