# Transistors Handbook vs Math Expert Pro

The clearest difference is review sentiment: Math Expert Pro at 67% against Transistors Handbook's 27%. Math Expert Pro also leads on price ($2.99 vs $3.99). Transistors Handbook's advantage is update cadence (fortnightly vs every 3 months). On ads, in-app purchases, monetization model and device support there is nothing between them.

Transistors Handbook costs $3.99 and Math Expert Pro $2.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Transistors Handbook ships an update fortnightly, Math Expert Pro every 3 months. The most recent releases landed on October 6, 2026 and October 8, 2026 respectively.

## The numbers

| Metric | Transistors Handbook | Math Expert Pro |
| --- | --- | --- |
| Price | $3.99 | **$2.99** |
| Rating | **[4.0 (22 ratings)](https://appshunter.io/ios/app/transistors-handbook/id474379633/reviews)** | — |
| Number of ratings | **22** | — |
| Positive reviews | 27.3% of reviews | **66.7% of reviews** |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Fortnightly** | Every 3 months |
| Monetization | Paid | Paid |
| Size | 22 MB | 10 MB |
| Requires iOS | **11.4** | 12.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Centro Studi Informatica di Danilo Priore](https://appshunter.io/developer/409935887) | [Markus Ide](https://appshunter.io/developer/625191124) |

## 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


### Math Expert Pro

[App page](https://appshunter.io/ios/app/math-expert-pro/id625198358)

This app provides a comprehensive collection of math and physics formulas. It features a unique calculator that determines possible calculations based on the information you input.

**Highlights:** Extensive math and physics formula library, Interactive formula calculator, Input-driven calculation suggestions, Supports iPhone, iPad, and iPod, Offline formula access

**Features:** macOS Compatibility, 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 Math Expert Pro free?

Math Expert Pro costs $2.99, with no in-app purchases.

### Do Transistors Handbook or Math Expert Pro have ads?

Neither Transistors Handbook nor Math Expert Pro shows ads.

### Which is updated more often, Transistors Handbook or Math Expert Pro?

Transistors Handbook ships an update fortnightly, and Math Expert Pro every 3 months. Most recently, Transistors Handbook was updated on October 6, 2026 and Math Expert Pro on October 8, 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.*