# 555 Timer & Oscillators Guide vs Digital Electronics+

The clearest difference is in-app purchases: 555 Timer & Oscillators Guide at none against Digital Electronics+'s 6. Digital Electronics+'s advantage is ads (none vs shown). On price, update cadence, device support and iOS requirement there is nothing between them.

Both are free to download. Digital Electronics+ sells 6 in-app purchases, starting at $9.99 per month. 555 Timer & Oscillators Guide asks for nothing beyond the download.

555 Timer & Oscillators Guide ships an update every 5 months, Digital Electronics+ every 6 months. The most recent releases landed on October 12, 2026 and September 30, 2026 respectively.

## The numbers

| Metric | 555 Timer & Oscillators Guide | Digital Electronics+ |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | Yes | **No** |
| Update frequency | **Every 5 months** | Every 6 months |
| Size | 24 MB | 24 MB |
| Requires iOS | **16.0** | 17.0 |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Forwa Elade Wunde](https://appshunter.io/developer/1685241344) |

## 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


### Digital Electronics+

[App page](https://appshunter.io/ios/app/digital-electronics-plus/id6747192806)

**Features:** macOS Compatibility

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| 1 Month | $9.99 | per month |
| 6 Months | $19.99 | per 6 months |
| 1 Year | $29.99 | per year |
| 1500 | $0.99 | one-time |
| 3500 | $1.99 | one-time |
| 9000 | $3.99 | one-time |


## Frequently asked questions

### Is 555 Timer & Oscillators Guide free?

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

### Is Digital Electronics+ free?

Digital Electronics+ is free to download, with in-app purchases available.

### Do 555 Timer & Oscillators Guide or Digital Electronics+ have ads?

555 Timer & Oscillators Guide shows ads; Digital Electronics+ does not.

### Which is updated more often, 555 Timer & Oscillators Guide or Digital Electronics+?

555 Timer & Oscillators Guide ships an update every 5 months, and Digital Electronics+ every 6 months. Most recently, 555 Timer & Oscillators Guide was updated on October 12, 2026 and Digital Electronics+ on September 30, 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.*