# Transistors Handbook vs Arduino Modules Pro

The clearest difference is update cadence: Transistors Handbook at fortnightly against Arduino Modules Pro's every 2 months. Transistors Handbook also leads on price ($3.99 vs $4.99) and iOS requirement (11.4 vs 16.0). On ads, in-app purchases and device support there is nothing between them.

Transistors Handbook costs $3.99 and Arduino Modules Pro $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Transistors Handbook ships an update fortnightly, Arduino Modules Pro every 2 months. The most recent releases landed on October 23, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | Transistors Handbook | Arduino Modules Pro |
| --- | --- | --- |
| Price | **$3.99** | $4.99 |
| Rating | **[3.9 (24 ratings)](https://appshunter.io/ios/app/transistors-handbook/id474379633/reviews)** | — |
| Number of ratings | **24** | — |
| Positive reviews | 27.3% of reviews | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 2 months |
| Monetization | Paid | — |
| Size | 22 MB | 31 MB |
| Requires iOS | **11.4** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Centro Studi Informatica di Danilo Priore](https://appshunter.io/developer/409935887) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Transistors Handbook

[App page](https://appshunter.io/ios/app/transistors-handbook/id474379633)

This app serves as a comprehensive guide to transistors, offering detailed information on over 51,000 types. Users can search for transistors by name or power, view graphical schemas, and access datasheets. It's designed to assist in selecting and designing electronic circuits.

**Highlights:** Database of over 51,000 transistors, Detailed transistor specifications, Graphical schema and code information, Search by name or power, Online datasheet access, Information on Silicon and Germanium transistors

**Features:** macOS Compatibility

**In-app purchases:** none


### Arduino Modules Pro

[App page](https://appshunter.io/ios/app/arduino-modules-pro/id6743318515)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Transistors Handbook free?

Transistors Handbook costs $3.99, with no in-app purchases.

### Is Arduino Modules Pro free?

Arduino Modules Pro costs $4.99, with no in-app purchases.

### Do Transistors Handbook or Arduino Modules Pro have ads?

Neither Transistors Handbook nor Arduino Modules Pro shows ads.

### Which is updated more often, Transistors Handbook or Arduino Modules Pro?

Transistors Handbook ships an update fortnightly, and Arduino Modules Pro every 2 months. Most recently, Transistors Handbook was updated on October 23, 2026 and Arduino Modules Pro on October 25, 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.*