# Electronics Tools & Calc Pro vs 555 Timer & Oscillators Guide

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

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

Both ship on a similar rhythm, roughly every 5 months. The most recent releases landed on September 27, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Electronics Tools & Calc Pro | 555 Timer & Oscillators Guide |
| --- | --- | --- |
| Price | $4.99 | **Free** |
| Rating | **[5.0 (5 ratings)](https://appshunter.io/ios/app/electronics-tools-and-calc-pro/id1581668963/reviews)** | — |
| Number of ratings | **5** | — |
| Positive reviews | 50.0% of reviews | — |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 5 months | Every 5 months |
| Monetization | Paid | — |
| Size | 58 MB | 24 MB |
| Requires iOS | **15.0** | 16.0 |
| Devices | **iPhone, iPad, iPod** | iPhone, iPad |
| 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 & Calc Pro

[App page](https://appshunter.io/ios/app/electronics-tools-and-calc-pro/id1581668963)

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

**Highlights:** Electronic component reference, Electronic circuit reference, Filter calculation tools, Inductor winding calculators, Resistor and capacitor calculations, Ohm's Law calculator, AC/DC power calculations

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

**In-app purchases:** none


### 555 Timer & Oscillators Guide

[App page](https://appshunter.io/ios/app/555-timer-and-oscillators-guide/id6504487994)

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

**In-app purchases:** none


## Frequently asked questions

### Is Electronics Tools & Calc Pro free?

Electronics Tools & Calc Pro costs $4.99, with no in-app purchases.

### Is 555 Timer & Oscillators Guide free?

555 Timer & Oscillators Guide is free to download, with no in-app purchases.

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

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

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

Electronics Tools & Calc Pro ships an update every 5 months, and 555 Timer & Oscillators Guide every 5 months. Most recently, Electronics Tools & Calc Pro was updated on September 27, 2026 and 555 Timer & Oscillators Guide on September 24, 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.*