# PEGASI Sleep vs iBACK

The clearest difference is review sentiment: iBACK at 71% against PEGASI Sleep's 20%. PEGASI Sleep's advantage is update cadence (every 3 weeks vs every 2 months). On price, ads, in-app purchases and monetization model there is nothing between them.

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

PEGASI Sleep ships an update every 3 weeks, iBACK every 2 months. The most recent releases landed on October 6, 2026 and October 17, 2026 respectively.

## The numbers

| Metric | PEGASI Sleep | iBACK |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.4 (8 ratings)](https://appshunter.io/ios/app/pegasi-sleep/id1073100252/reviews)** | — |
| Number of ratings | **8** | — |
| Positive reviews | 20.0% of reviews | **71.4% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 3 weeks** | Every 2 months |
| Monetization | Free | Free |
| Size | 41 MB | 27 MB |
| Requires iOS | 12.0 | 12.0 |
| Devices | iPhone, iPod | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Qianhai Icecold IT Co., Ltd.](https://appshunter.io/developer/1073100251) | [Vladimir Vesnin](https://appshunter.io/developer/1437058410) |

## What reviewers say

### PEGASI Sleep

[App page](https://appshunter.io/ios/app/pegasi-sleep/id1073100252)

This app works with special glasses to help improve sleep quality, reduce the time it takes to fall asleep, and increase deep sleep. It aims to boost daytime energy and productivity while easing jet lag symptoms.

**Highlights:** Improve sleep quality, Shorten time to fall asleep, Increase deep sleep, Wake up naturally, Increase daytime energy, Reduce jet lag symptoms

**Features:** macOS Compatibility

**In-app purchases:** none


### iBACK

[App page](https://appshunter.io/ios/app/iback/id1437058411)

This app helps reduce back pain and strengthen back muscles through short, guided exercises. It uses a posture sensor that vibrates to remind users to maintain proper posture.

**Highlights:** Reduce back pain, Strengthen back muscles, 5-minute exercises, Posture sensor integration, Vibration reminders for posture

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is PEGASI Sleep free?

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

### Is iBACK free?

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

### Do PEGASI Sleep or iBACK have ads?

Neither PEGASI Sleep nor iBACK shows ads.

### Which is updated more often, PEGASI Sleep or iBACK?

PEGASI Sleep ships an update every 3 weeks, and iBACK every 2 months. Most recently, PEGASI Sleep was updated on October 6, 2026 and iBACK on October 17, 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.*