# 555 Timer & Oscillators Guide vs MyCalcTutor

The clearest difference is iOS requirement: 555 Timer & Oscillators Guide at 16.0 against MyCalcTutor's 18.2. On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | 555 Timer & Oscillators Guide | MyCalcTutor |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | — |
| Size | 24 MB | 4 MB |
| Requires iOS | **16.0** | 18.2 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Jeremy Burkett](https://appshunter.io/developer/1254864326) |

## What reviewers say

### 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


### MyCalcTutor

[App page](https://appshunter.io/ios/app/mycalctutor/id6740751073)

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

**In-app purchases:** none


## Frequently asked questions

### Is 555 Timer & Oscillators Guide free?

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

### Is MyCalcTutor free?

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

### Do 555 Timer & Oscillators Guide or MyCalcTutor have ads?

Both 555 Timer & Oscillators Guide and MyCalcTutor show ads.

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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.*