# Four Arithmetic Operations vs lumen.

The clearest difference is price: Four Arithmetic Operations at Free against lumen.'s $3.99. Four Arithmetic Operations also leads on iOS requirement (7.1 vs 13.0). lumen.'s advantage is device support (5 vs 2). On ads and in-app purchases there is nothing between them.

Four Arithmetic Operations is free to download; lumen. costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

## The numbers

| Metric | Four Arithmetic Operations | lumen. |
| --- | --- | --- |
| Price | **Free** | $3.99 |
| Rating | — | **[4.8 (41 ratings)](https://appshunter.io/ios/app/lumen/id6757416129/reviews)** |
| Number of ratings | — | **41** |
| Positive reviews | — | 83.3% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Monetization | — | Paid |
| Size | 11 MB | 507 MB |
| Requires iOS | **7.1** | 13.0 |
| Devices | iPhone, iPod | **iPhone, iPad, iPod, Mac, Apple TV** |
| Age rating | 4+ | 4+ |
| Developer | [Yu Saito](https://appshunter.io/developer/432081470) | [Lykkegaard Europe Limited](https://appshunter.io/developer/1276464042) |

## What reviewers say

### Four Arithmetic Operations

[App page](https://appshunter.io/ios/app/four-arithmetic-operations/id1076116230)

**Features:** macOS Compatibility

**In-app purchases:** none


### lumen.

[App page](https://appshunter.io/ios/app/lumen/id6757416129)

Solve intricate puzzles using light, lenses, and mirrors in a charming attic setting. Restore antique inventions with hundreds of family-friendly levels designed for all ages. Enjoy beautiful graphics and a soothing soundtrack.

**Highlights:** Light, lens, and mirror puzzles, Hundreds of well-designed levels, Family-friendly gameplay, Cross-device save functionality, Beautiful graphics and music, Easy to learn, hard to master

**Features:** Game Controller support, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is Four Arithmetic Operations free?

Four Arithmetic Operations is free to download, with no in-app purchases.

### Is lumen. free?

lumen. costs $3.99, with no in-app purchases.

### Do Four Arithmetic Operations or lumen. have ads?

Neither Four Arithmetic Operations nor lumen. shows ads.

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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.*