# Math Queen / Math King vs 555 Timer & Oscillators Guide

The clearest difference is ads: Math Queen / Math King at none against 555 Timer & Oscillators Guide's shown. 555 Timer & Oscillators Guide's advantage is update cadence (every 5 months vs every 30 months) and iOS requirement (16.0 vs 26.0). 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.

Math Queen / Math King ships an update every 30 months, 555 Timer & Oscillators Guide every 5 months. The most recent releases landed on September 14, 2026 and September 24, 2026 respectively.

## The numbers

| Metric | Math Queen / Math King | 555 Timer & Oscillators Guide |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | No | No |
| Ads | **No** | Yes |
| Update frequency | Every 30 months | **Every 5 months** |
| Size | 11 MB | 24 MB |
| Requires iOS | 26.0 | **16.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | +4 |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [ALG Software Lab](https://appshunter.io/developer/1650561236) |

## What reviewers say

### Math Queen / Math King

[App page](https://appshunter.io/ios/app/math-queen-math-king/id6477328464)

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

**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 Math Queen / Math King free?

Math Queen / Math King 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 Math Queen / Math King or 555 Timer & Oscillators Guide have ads?

555 Timer & Oscillators Guide shows ads; Math Queen / Math King does not.

### Which is updated more often, Math Queen / Math King or 555 Timer & Oscillators Guide?

Math Queen / Math King ships an update every 30 months, and 555 Timer & Oscillators Guide every 5 months. Most recently, Math Queen / Math King was updated on September 14, 2026 and 555 Timer & Oscillators Guide on September 24, 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.*