# OhStem App vs SKY

The clearest difference is iOS requirement: OhStem App at 11.0 against SKY's 15.1. On price, update cadence, 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.

OhStem App ships an update every 4 weeks, SKY every 6 weeks. The most recent releases landed on October 6, 2026 and October 9, 2026 respectively.

## The numbers

| Metric | OhStem App | SKY |
| --- | --- | --- |
| Price | Free | Free |
| Positive reviews | 66.7% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 4 weeks** | Every 6 weeks |
| Monetization | Free | — |
| Size | 46 MB | 43 MB |
| Requires iOS | **11.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [ADT EDUCATION TECHNOLOGY COMPANY LIMITED](https://appshunter.io/developer/1538320096) | [SKY-LINE School](https://appshunter.io/developer/1831218041) |

## What reviewers say

### OhStem App

[App page](https://appshunter.io/ios/app/ohstem-app/id1540805396)

This app allows users to control and program STEM robot products. It features step-by-step assembly guides, Bluetooth robot control, and a drag-and-drop programming interface suitable for ages 7-15. Users can also design custom control panels and follow interactive programming lessons.

**Highlights:** Step-by-step assembly guides, Bluetooth robot control, Drag-and-drop programming interface, Customizable control panel design, Interactive programming lessons

**Features:** macOS Compatibility

**In-app purchases:** none


### SKY

[App page](https://appshunter.io/ios/app/sky-line-school-e-connect/id6749571097)

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is OhStem App free?

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

### Is SKY free?

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

### Do OhStem App or SKY have ads?

Neither OhStem App nor SKY shows ads.

### Which is updated more often, OhStem App or SKY?

OhStem App ships an update every 4 weeks, and SKY every 6 weeks. Most recently, OhStem App was updated on October 6, 2026 and SKY on October 9, 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.*