# 555 Timer & Oscillators Guide vs EDoctronics

The clearest difference is update cadence: EDoctronics at every 3 weeks against 555 Timer & Oscillators Guide's every 5 months. 555 Timer & Oscillators Guide's advantage is iOS requirement (16.0 vs 18.6). 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.

555 Timer & Oscillators Guide ships an update every 5 months, EDoctronics every 3 weeks. The most recent releases landed on September 24, 2026 and September 10, 2026 respectively.

## The numbers

| Metric | 555 Timer & Oscillators Guide | EDoctronics |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | Yes |
| Update frequency | Every 5 months | **Every 3 weeks** |
| Size | 24 MB | 5 MB |
| Requires iOS | **16.0** | 18.6 |
| Devices | **iPhone, iPad** | iPhone |
| Age rating | +4 | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Jonathan Abimael Cruz Orozco](https://appshunter.io/developer/1111055904) |

## 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


### EDoctronics

[App page](https://appshunter.io/ios/app/edoctronics/id6752360310)

**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 EDoctronics free?

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

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

Both 555 Timer & Oscillators Guide and EDoctronics show ads.

### Which is updated more often, 555 Timer & Oscillators Guide or EDoctronics?

555 Timer & Oscillators Guide ships an update every 5 months, and EDoctronics every 3 weeks. Most recently, 555 Timer & Oscillators Guide was updated on September 24, 2026 and EDoctronics on September 10, 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.*