# Electronics Tools & Calculator vs 555 Timer & Oscillators Pro

The clearest difference is price: Electronics Tools & Calculator at Free against 555 Timer & Oscillators Pro's $4.99. Electronics Tools & Calculator also leads on update cadence (every 2 months vs every 3 months). 555 Timer & Oscillators Pro's advantage is ads (none vs shown). On in-app purchases, device support and iOS requirement there is nothing between them.

Electronics Tools & Calculator is free to download; 555 Timer & Oscillators Pro costs $4.99 up front. Neither carries in-app purchases, so what you see is what you pay.

Electronics Tools & Calculator ships an update every 2 months, 555 Timer & Oscillators Pro every 3 months. The most recent releases landed on September 9, 2026 and September 21, 2026 respectively.

## The numbers

| Metric | Electronics Tools & Calculator | 555 Timer & Oscillators Pro |
| --- | --- | --- |
| Price | **Free** | $4.99 |
| Rating | **[4.0 (16 ratings)](https://appshunter.io/ios/app/electronics-tools-and-calculator/id1581885136/reviews)** | — |
| Number of ratings | **16** | — |
| Positive reviews | 16.7% of reviews | — |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | **Every 2 months** | Every 3 months |
| Monetization | Free | — |
| Size | 63 MB | 22 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, Mac |
| Age rating | 4+ | 4+ |
| Developer | [Anas Abubakar](https://appshunter.io/developer/1581534101) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Electronics Tools & Calculator

[App page](https://appshunter.io/ios/app/electronics-tools-and-calculator/id1581885136)

This app serves as a pocket-sized electronics lab, offering a comprehensive reference for components and circuits. It simplifies complex calculations for filters, inductors, and various circuit configurations, aiding both engineers and hobbyists in their design processes.

**Highlights:** Electronic component reference, Electronic circuit reference, Filter design calculators, Inductor winding calculators, Transformer winding calculators, Resistor and capacitor calculations, Ohm's law and power calculations

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

**In-app purchases:** none


### 555 Timer & Oscillators Pro

[App page](https://appshunter.io/ios/app/555-timer-and-oscillators-pro/id6504415162)

**Features:** Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Electronics Tools & Calculator free?

Electronics Tools & Calculator is free to download, with no in-app purchases.

### Is 555 Timer & Oscillators Pro free?

555 Timer & Oscillators Pro costs $4.99, with no in-app purchases.

### Do Electronics Tools & Calculator or 555 Timer & Oscillators Pro have ads?

Electronics Tools & Calculator shows ads; 555 Timer & Oscillators Pro does not.

### Which is updated more often, Electronics Tools & Calculator or 555 Timer & Oscillators Pro?

Electronics Tools & Calculator ships an update every 2 months, and 555 Timer & Oscillators Pro every 3 months. Most recently, Electronics Tools & Calculator was updated on September 9, 2026 and 555 Timer & Oscillators Pro on September 21, 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.*