# ST Integrity App vs 555 Timer & Oscillators Guide

The clearest difference is ads: ST Integrity App at none against 555 Timer & Oscillators Guide's shown. ST Integrity App also leads on iOS requirement (12.0 vs 16.0). On price, update cadence, 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.

ST Integrity App ships an update every 4 months, 555 Timer & Oscillators Guide every 5 months. The most recent releases landed on September 16, 2026 and October 2, 2026 respectively.

## The numbers

| Metric | ST Integrity App | 555 Timer & Oscillators Guide |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | **Every 4 months** | Every 5 months |
| Size | 30 MB | 24 MB |
| Requires iOS | **12.0** | 16.0 |
| Devices | iPhone, iPod | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [STMicroelectronics](https://appshunter.io/developer/1801774735) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### ST Integrity App

[App page](https://appshunter.io/ios/app/st-integrity-app/id1301440442)

**Features:** macOS Compatibility

**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 ST Integrity App free?

ST Integrity App is free to download, 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 ST Integrity App or 555 Timer & Oscillators Guide have ads?

555 Timer & Oscillators Guide shows ads; ST Integrity App does not.

### Which is updated more often, ST Integrity App or 555 Timer & Oscillators Guide?

ST Integrity App ships an update every 4 months, and 555 Timer & Oscillators Guide every 5 months. Most recently, ST Integrity App was updated on September 16, 2026 and 555 Timer & Oscillators Guide on October 2, 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.*