# BlueGrays vs Tenio

The clearest difference is rating: Tenio at 5.0 against BlueGrays's 4.4. Tenio also leads on in-app purchases (none vs 6) and ads (none vs shown). BlueGrays's advantage is update cadence (every 6 days vs every 4 months) and ratings volume (11 vs 2). On price, device support and iOS requirement there is nothing between them.

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

Tenio holds the better App Store score, 5.0 against 4.4. That said, the two scores are not equally well evidenced: BlueGrays has 11 ratings behind it against 2, so its average is the more settled of the two.

BlueGrays ships an update every 6 days, Tenio every 4 months. The most recent releases landed on September 17, 2026 and October 1, 2026 respectively.

## The numbers

| Metric | BlueGrays | Tenio |
| --- | --- | --- |
| Price | Free | Free |
| Rating | [4.4 (11 ratings)](https://appshunter.io/ios/app/bluegrays-learn-electronics/id6502332602/reviews) | **[5.0 (2 ratings)](https://appshunter.io/ios/app/tenio-electronics-toolkit-lab/id6757969551/reviews)** |
| Number of ratings | **11** | 2 |
| Positive reviews | 64.3% of reviews | — |
| In-app purchases | Yes | **No** |
| Ads | Yes | **No** |
| Update frequency | **Every 6 days** | Every 4 months |
| Monetization | Free with in-app purchases | **Free** |
| Size | 51 MB | 7 MB |
| Requires iOS | 15.1 | **15.0** |
| Devices | iPhone, iPod | **iPhone, iPad, iPod** |
| Age rating | 4+ | 4+ |
| Developer | [Yunus Emre Eke](https://appshunter.io/developer/1713998736) | [Samuel Rodas Aroche](https://appshunter.io/developer/1706040833) |

## What reviewers say

### 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 |


### Tenio

[App page](https://appshunter.io/ios/app/tenio-electronics-toolkit-lab/id6757969551)

This app provides a suite of calculators and converters for electronics enthusiasts, students, and makers. It helps users quickly solve circuit tasks, decode component markings, and calculate values for resistors and capacitors, speeding up project development.

**Highlights:** Resistor color code calculator, SMD resistor code converter, LED resistor calculator, Series & parallel resistor calculator, SMD capacitor code calculator, Series & parallel capacitor calculator

**Features:** macOS Compatibility

**In-app purchases:** none


## Frequently asked questions

### Is BlueGrays free?

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

### Is Tenio free?

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

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

Tenio is rated higher. BlueGrays averages 4.4 out of 5 from 11 ratings, while Tenio averages 5.0 from 2 ratings.

### Do BlueGrays or Tenio have ads?

BlueGrays shows ads; Tenio does not.

### Which is updated more often, BlueGrays or Tenio?

BlueGrays ships an update every 6 days, and Tenio every 4 months. Most recently, BlueGrays was updated on September 17, 2026 and Tenio on October 1, 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.*