# 555 Timer & Oscillators Guide vs OMS LMS

The clearest difference is ads: OMS LMS at none against 555 Timer & Oscillators Guide's shown. OMS LMS also leads on iOS requirement (13.0 vs 16.0). On price, 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 | OMS LMS |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | Yes | **No** |
| Update frequency | Every 5 months | — |
| Size | 24 MB | 69 MB |
| Requires iOS | 16.0 | **13.0** |
| Devices | iPhone, iPad | **iPhone, iPad, iPod** |
| Age rating | 4+ | 17+ |
| Developer | [ALG Software Lab](https://appshunter.io/developer/1650561236) | [Mohamed Alaa](https://appshunter.io/developer/1782331919) |

## 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


### OMS LMS

[App page](https://appshunter.io/ios/app/oms-lms/id6739004734)

**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 OMS LMS free?

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

### Do 555 Timer & Oscillators Guide or OMS LMS have ads?

555 Timer & Oscillators Guide shows ads; OMS LMS does not.

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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.*