# WonderArm vs STEM Dotz

The clearest difference is update cadence: WonderArm at fortnightly against STEM Dotz's every 8 months. On price, ads, in-app purchases and device support there is nothing between them.

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

WonderArm ships an update fortnightly, STEM Dotz every 8 months. The most recent releases landed on October 11, 2026 and October 7, 2026 respectively.

## The numbers

| Metric | WonderArm | STEM Dotz |
| --- | --- | --- |
| Price | Free | Free |
| Rating | — | **[5.0 (1 ratings)](https://appshunter.io/ios/app/stem-dotz/id6471081806/reviews)** |
| Number of ratings | — | **1** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 8 months |
| Monetization | — | Free |
| Size | 3 MB | 72 MB |
| Requires iOS | **12.0** | 13.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Shenzhen Hiwonder Technology Co.,Ltd](https://appshunter.io/developer/1090806812) | [Stemious Solutions Private Limited](https://appshunter.io/developer/1535183799) |

## What reviewers say

### WonderArm

[App page](https://appshunter.io/ios/app/wonderarm/id6447750347)

**Features:** macOS Compatibility

**In-app purchases:** none


### STEM Dotz

[App page](https://appshunter.io/ios/app/stem-dotz/id6471081806)

This app collects and graphs data from a wireless multisensor, offering over 30 guided activities and supporting user-designed scientific explorations. It helps reinforce science understanding and develop critical-thinking skills.

**Highlights:** Data collection from multisensor, Graphing of collected data, Over 30 guided activities, User-designed explorations, Reinforces science understanding, Develops critical-thinking skills

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

**In-app purchases:** none


## Frequently asked questions

### Is WonderArm free?

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

### Is STEM Dotz free?

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

### Do WonderArm or STEM Dotz have ads?

Neither WonderArm nor STEM Dotz shows ads.

### Which is updated more often, WonderArm or STEM Dotz?

WonderArm ships an update fortnightly, and STEM Dotz every 8 months. Most recently, WonderArm was updated on October 11, 2026 and STEM Dotz on October 7, 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.*