# RoboArm vs BlueGrays

The clearest difference is rating: RoboArm at 5.0 against BlueGrays's 4.2. RoboArm also leads on in-app purchases (none vs 6) and iOS requirement (12.0 vs 15.1). BlueGrays's advantage is ratings volume (13 vs 1). On price, ads and device support there is nothing between them.

Both are free to download. BlueGrays sells 6 in-app purchases, starting at $2.99 per month. RoboArm asks for nothing beyond the download.

RoboArm holds the better App Store score, 5.0 against 4.2. That said, the two scores are not equally well evidenced: BlueGrays has 13 ratings behind it against 1, so its average is the more settled of the two.

## The numbers

| Metric | RoboArm | BlueGrays |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[5.0 (1 ratings)](https://appshunter.io/ios/app/roboarm/id1568905242/reviews)** | [4.2 (13 ratings)](https://appshunter.io/ios/app/bluegrays-learn-electronics/id6502332602/reviews) |
| Number of ratings | 1 | **13** |
| Positive reviews | — | 64.3% of reviews |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | — | Every 6 days |
| Monetization | **Free** | Free with in-app purchases |
| Size | 11 MB | 52 MB |
| Requires iOS | **12.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Igor Erostenko](https://appshunter.io/developer/1568905244) | [Yunus Emre Eke](https://appshunter.io/developer/1713998736) |

## What reviewers say

### RoboArm

[App page](https://appshunter.io/ios/app/roboarm/id1568905242)

Control a DIY robotic arm built from a construction kit. This educational app is designed for children aged 10 and up, as well as adults, to interact with their assembled robotic creations.

**Highlights:** Robotic arm control, DIY construction kit integration, Educational for ages 10+, Arduino-based technology, Interactive learning

**Features:** macOS Compatibility

**In-app purchases:** none


### BlueGrays

[App page](https://appshunter.io/ios/app/bluegrays-learn-electronics/id6502332602)

Learn electronics with interactive projects, a component catalog, and personal inventory management. Start with free projects and unlock full access to Arduino, ESP32, and IoT content with a premium subscription. Gamified learning with badges and levels keeps you motivated.

**Highlights:** Free starter projects, Unlimited Arduino/ESP32/IoT projects, Detailed circuit diagrams and code, Component catalog with specifications, Personal inventory management, Gamified learning with badges and levels, Multi-language support

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

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Premium (Monthly) | $2.99 | per month |
| Premium (Yearly) | $11.99 | per year |
| 5x Aylık Eğitimci Paketi | $12.99 | one-time |
| 10x Aylık Eğitimci Paketi | $23.99 | one-time |
| 5x Yıllık Eğitimci Paketi | $53.99 | one-time |
| 10x Yıllık Eğitimci Paketi | $101.99 | one-time |


## Frequently asked questions

### Is RoboArm free?

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

### Is BlueGrays free?

BlueGrays is free to download, with in-app purchases available.

### Which has better reviews, RoboArm or BlueGrays?

RoboArm is rated higher. RoboArm averages 5.0 out of 5 from 1 ratings, while BlueGrays averages 4.2 from 13 ratings.

### Do RoboArm or BlueGrays have ads?

Neither RoboArm nor BlueGrays shows ads.

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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.*