# Arduino Pocket Reference vs BlueGrays

The clearest difference is review sentiment: BlueGrays at 64% against Arduino Pocket Reference's 12%. BlueGrays also leads on rating (4.4 vs 2.4) and update cadence (every 6 days vs every 5 months). On price, ratings volume, ads and in-app purchases there is nothing between them.

Both are free to download. Arduino Pocket Reference sells 1 one-off in-app purchase and BlueGrays sells 6 in-app purchases, starting at $2.99 per month. Whichever you choose, the download price is not the number that matters.

BlueGrays holds the better App Store score, 4.4 against 2.4. Both are backed by a comparable volume of ratings — 17 and 11 respectively. Written reviews point the same way: 12% of Arduino Pocket Reference's written reviews are positive against 64% of BlueGrays's.

Arduino Pocket Reference ships an update every 5 months, BlueGrays every 6 days. The most recent releases landed on June 2, 2026 and September 17, 2026 respectively.

## The numbers

| Metric | Arduino Pocket Reference | BlueGrays |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [2.4 (17 ratings)](https://appshunter.io/ios/app/arduino-pocket-reference/id969849288/reviews) | **[4.4 (11 ratings)](https://appshunter.io/ios/app/bluegrays-learn-electronics/id6502332602/reviews)** |
| Number of ratings | **17** | 11 |
| Positive reviews | 12.0% of reviews | **64.3% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 6 days** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 78 MB | 51 MB |
| Requires iOS | **14.0** | 15.1 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Vipin Nair](https://appshunter.io/developer/841810400) | [Yunus Emre Eke](https://appshunter.io/developer/1713998736) |

## What reviewers say

### Arduino Pocket Reference

[App page](https://appshunter.io/ios/app/arduino-pocket-reference/id969849288)

This app provides a comprehensive reference for Arduino programming, covering core libraries, syntax, operators, and various hardware shields. It includes examples for common functionalities like mouse control, GSM communication, and LCD displays, making it a valuable tool for makers and developers.

**Highlights:** Arduino core libraries list, Mouse and Keyboard control examples, GSM communication examples, LiquidCrystal library functions, Syntax, operators, and data types, Various Arduino board guides, IO and math functions

**Features:** macOS Compatibility

**In-app purchases (1)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Remove Advertisements | $0.99 | one-time |


### 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 Arduino Pocket Reference free?

Arduino Pocket Reference is free to download, with in-app purchases available.

### Is BlueGrays free?

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

### Which has better reviews, Arduino Pocket Reference or BlueGrays?

BlueGrays is rated higher. Arduino Pocket Reference averages 2.4 out of 5 from 17 ratings, while BlueGrays averages 4.4 from 11 ratings.

### Do Arduino Pocket Reference or BlueGrays have ads?

Both Arduino Pocket Reference and BlueGrays show ads.

### Which is updated more often, Arduino Pocket Reference or BlueGrays?

Arduino Pocket Reference ships an update every 5 months, and BlueGrays every 6 days. Most recently, Arduino Pocket Reference was updated on June 2, 2026 and BlueGrays on September 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.*