# Math Queen / Math King vs AVR Projects

The clearest difference is in-app purchases: Math Queen / Math King at none against AVR Projects's 10. AVR Projects's advantage is update cadence (daily vs every 30 months) and iOS requirement (17.0 vs 26.0). On price, ads and device support there is nothing between them.

Both are free to download. AVR Projects sells 10 one-off in-app purchases. Math Queen / Math King asks for nothing beyond the download.

Math Queen / Math King ships an update every 30 months, AVR Projects daily. The most recent releases landed on October 2, 2026 and September 26, 2026 respectively.

## The numbers

| Metric | Math Queen / Math King | AVR Projects |
| --- | --- | --- |
| Price | Free | Free |
| In-app purchases | **No** | Yes |
| Ads | No | No |
| Update frequency | Every 30 months | **Daily** |
| Size | 11 MB | 20 MB |
| Requires iOS | 26.0 | **17.0** |
| Devices | iPhone, iPad | iPhone, iPad |
| Age rating | 4+ | 4+ |
| Developer | [Gerhard Lentschik](https://appshunter.io/developer/629988041) | [Zaw Win Myat](https://appshunter.io/developer/1800881321) |

## 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


### AVR Projects

[App page](https://appshunter.io/ios/app/avr-projects/id6745124011)

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

**In-app purchases (10)**

| Purchase | Price | Billing |
| --- | --- | --- |
| R2R Ladder DAC | $0.99 | one-time |
| Sawtooth Waveform | $0.99 | one-time |
| Triangular Waveform | $0.99 | one-time |
| Sine Waveform | $0.99 | one-time |
| Ammeter AVR | $0.99 | one-time |
| 4x3 Matrix Keypad | $0.99 | one-time |
| Ohm Meter AVR | $0.99 | one-time |
| Voltmeter AVR | $0.99 | one-time |
| TM1637 Interfacing with AVR | $0.99 | one-time |
| Graphic LCD Interfacing | $0.99 | one-time |


## Frequently asked questions

### Is Math Queen / Math King free?

Math Queen / Math King is free to download, with no in-app purchases.

### Is AVR Projects free?

AVR Projects is free to download, with in-app purchases available.

### Do Math Queen / Math King or AVR Projects have ads?

Neither Math Queen / Math King nor AVR Projects shows ads.

### Which is updated more often, Math Queen / Math King or AVR Projects?

Math Queen / Math King ships an update every 30 months, and AVR Projects daily. Most recently, Math Queen / Math King was updated on October 2, 2026 and AVR Projects on September 26, 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.*