# SLS vs DYB Window

The clearest difference is update cadence: DYB Window at fortnightly against SLS's every 8 months. DYB Window also leads on review sentiment (49% vs 33%). SLS's advantage is iOS requirement (12.0 vs 16.6). 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.

SLS ships an update every 8 months, DYB Window fortnightly. The most recent releases landed on October 7, 2026 and October 14, 2026 respectively.

## The numbers

| Metric | SLS | DYB Window |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[3.3 (20 ratings)](https://appshunter.io/ios/app/dyb-window/id6473522970/reviews)** |
| Number of ratings | — | **20** |
| Positive reviews | 33.3% of reviews | **49.2% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 8 months | **Fortnightly** |
| Monetization | Free | Free |
| Size | 13 MB | 57 MB |
| Requires iOS | **12.0** | 16.6 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [IAP EDU](https://appshunter.io/developer/1545801777) | [Edu Brain Co. Ltd](https://appshunter.io/developer/1719087208) |

## What reviewers say

### SLS

[App page](https://appshunter.io/ios/app/sls/id1545901734)

This is a smart application for Korean language learning, developed by IAP EDU. It offers an educational experience focused on mastering the Korean language.

**Highlights:** Korean language learning, Smart application, Educational content, Developed by IAP EDU

**Features:** macOS Compatibility

**In-app purchases:** none


### DYB Window

[App page](https://appshunter.io/ios/app/dyb-window/id6473522970)

This app allows students to submit homework and tests, receive individual feedback, and track their learning progress. It builds a unique history of academic achievements for comprehensive performance management.

**Highlights:** Submit homework and tests, Receive individual feedback, Track learning progress, View class schedules, Check shuttle bus information, Manage retakes and supplementary lessons

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is SLS free?

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

### Is DYB Window free?

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

### Do SLS or DYB Window have ads?

Neither SLS nor DYB Window shows ads.

### Which is updated more often, SLS or DYB Window?

SLS ships an update every 8 months, and DYB Window fortnightly. Most recently, SLS was updated on October 7, 2026 and DYB Window on October 14, 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.*